CN115558867B - Rare earth microalloyed high carbon chromium bearing steel resistant to chloride ion corrosion - Google Patents
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
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- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/32—Soft annealing, e.g. spheroidising
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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Abstract
The invention discloses rare earth element alloyed high-carbon chromium bearing steel resistant to chloride ion corrosion, and relates to the technical field of metal materials. The invention aims to improve the corrosion resistance of the high-carbon chromium bearing steel in a chloride ion environment while improving the related mechanical properties of the high-carbon chromium bearing steel. The grain size of the rare earth element microalloyed high-carbon chromium bearing steel is thinned to 2.15-2.58 mu m compared with that of bearing steel without rare earth, and the micro Vickers hardness is improved to 556.9HV, and the room-temperature impact toughness is improved by 36.7%. In 0.1M chloride ion solution, the high carbon chromium bearing steel has a higher corrosion potential and a lower corrosion current density than bearing steel without rare earth elements, and exhibits better corrosion resistance.
Description
Technical Field
The invention relates to rare earth high-carbon chromium bearing steel resistant to chloride ion corrosion, and belongs to the technical field of metal materials.
Background
Bearing steel, which is one of the main types of special steel, is widely used for manufacturing rolling balls, balls and rollers of rolling bearings. The high-carbon chromium bearing steel is widely applied due to the low alloy content and excellent mechanical properties such as hardness, wear resistance and the like. Along with the increasingly severe service environment of the bearing and the continuous improvement of service life requirements, the method has important significance for improving the service performance of the bearing. The research shows that the rare earth element alloying is used as an alloying method for improving the internal cleanliness of the bearing steel, and can modify inclusions in the steel, so that the comprehensive performance of the bearing steel is improved, and the service life of the bearing steel is prolonged.
Corrosion failure of bearings by chloride ion attack in service environments is a common form of failure, particularly in marine vessels and chlorine-containing environments. High carbon chromium bearing steels are less resistant to chloride ion attack due to their higher carbon content and fewer alloying elements. Research shows that rare earth elements can influence the corrosion behavior of bearing steel while purifying deformed inclusions in molten steel. However, until now, research on the influence of rare earth elements on high-carbon chromium bearing steel has been mainly focused on the research on the deterioration of inclusions and the impact behavior, and the research on the influence of corrosion behavior thereof is less.
For the reasons, the development and research of the rare earth high-carbon chromium bearing steel with better corrosion resistance have important significance for the development and application of the high-carbon chromium bearing steel.
Disclosure of Invention
In order to solve the problems, the invention aims to develop and provide rare earth microalloyed high carbon chromium bearing steel resistant to chloride ion corrosion. After rare earth element microalloying, the hardness and impact absorption power of the rare earth element microalloying alloy are improved, and meanwhile, the chloride ion corrosion resistance is further improved. To achieve the desired properties, high carbon chromium bearing steels require heat treatment for structural control. The invention provides a heat treatment method of rare earth high-carbon chromium bearing steel.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the rare earth high-carbon chromium bearing steel resistant to chloride ion corrosion comprises, by mass, 0.91-1.02% of C, 1.49-1.60% of Cr, 0.28-0.45% of Mn, 0.17-0.34% of Si, less than or equal to 0.003% of S, less than or equal to 0.003% of P, 0.003% of rare earth element, and the balance of Fe and unavoidable impurity elements. It should be noted that the above listed chemical composition ratios refer to the content of each element in the final high carbon chromium bearing steel.
Preferably, the rare earth elements are La and Ce, and the ratio of La: ce=0.8: 1 to 1.5:1
Preferably, the heat treatment method of the rare earth high carbon chromium bearing steel resistant to chloride ion corrosion comprises the following steps:
(1) Before quenching the sample, performing spheroidizing annealing treatment; the hot-rolled rare earth bearing steel blank is firstly subjected to spheroidizing annealing treatment so as to improve the processing plasticity and cutting performance of the steel. Heating to steel A c1 And (5) heat preservation is carried out at a temperature above the temperature. After the heat preservation is finished, the steel is cooled to 500 ℃ along with the furnace, and then is discharged from the furnace and cooled to room temperature.
(2) Removing surface oxide by using sand paper, and cleaning the surface of a sample by adopting ultrasonic vibration;
(3) Putting the sample into a muffle furnace for austenitizing quenching, wherein the steel subjected to spheroidizing annealing needs to be quenched to enable austenite to be converted into martensite;
(4) Cleaning the quenching oil remained on the surface of the sample, and removing surface oxide skin;
(5) And (5) immediately tempering after quenching is finished, and obtaining the rare earth high-carbon chromium bearing steel in the service state after tempering.
Preferably, in the step (1), the spheroidizing annealing heat preservation temperature is 800 ℃, the heat preservation time is 1h, and the temperature of the sample is increased along with the furnace at a heating rate of 8 ℃/min. After the heat preservation is finished, the sample is cooled to 500 ℃ along with the furnace and then cooled to room temperature in the air, so that the purposes of spheroidizing carbide in the high-carbon chromium bearing steel and increasing the mechanical property of the high-carbon chromium bearing after quenching and tempering are realized.
Preferably, samples in the step (2) are sequentially polished by 100-2000 # sand paper, and are subjected to ultrasonic vibration cleaning in absolute ethanol solution for 15min at 25 ℃.
Preferably, in the step (3), the austenite temperature is 820 ℃, the temperature is kept for 15min, and the temperature of the sample is increased along with the furnace at a speed of 8 ℃/min. After the incubation, the sample was immediately cooled in quench oil.
Preferably, in the step (4), ultrasonic cleaning is performed by using an acetone solution, wherein the cleaning time is 15min, and the temperature is 25 ℃. The oxide skin on the surface of the sample is sequentially polished and removed by using 1000 # sand paper to 2000# sand paper.
Preferably, in the step (5), the tempering temperature is 160 ℃, the heat preservation time is 1h, and the temperature of the sample is increased along with the furnace at the rate of 8 ℃/min. After the incubation was completed, the sample was cooled to room temperature in air. The quenching stress is eliminated and deformation and cracking are avoided while the hardness of the rare earth high-carbon chromium bearing steel is not reduced, so that a tempered martensite structure is obtained.
The invention has the following beneficial effects:
according to the invention, the grain size of the high-carbon chromium bearing steel is thinned through the microalloying effect of La and Ce, wherein the grain size is thinned from 2.69 mu m to 2.15-2.58 mu m before rare earth addition.
The invention improves the impact toughness of the high-carbon chromium bearing steel by about 36.7 percent through the microalloying effect of La and Ce.
According to the invention, through the microalloying effect of La and Ce, the micro Vickers hardness of the high-carbon chromium bearing steel is improved from 530HV to 556.9HV.
According to the invention, through the microalloying effect of La and Ce, the corrosion resistance of the high-carbon chromium bearing steel in 0.1M chloride ion solution is improved. Wherein the corrosion current density is reduced by about 29%.
Drawings
FIG. 1 is an XRD pattern of a rare earth high carbon chromium bearing steel of the present invention;
FIG. 2 is a graph showing the distribution of the inverse pole pattern and grain size of the rare earth high carbon chromium bearing steel of the present invention;
FIG. 3 is a plot of tensile stress versus displacement at room temperature for a rare earth high carbon chromium bearing steel of the present invention;
FIG. 4 is a bar graph of the micro Vickers hardness of the rare earth high carbon chromium bearing steel of the present invention;
FIG. 5 is a bar graph of the room temperature impact absorption work of the rare earth high carbon chromium bearing steel of the present invention;
FIG. 6 is a polarization curve of the rare earth high carbon chromium bearing steel of the present invention in 0.1M NaCl solution;
Detailed Description
A rare earth microalloyed high carbon chromium bearing steel in accordance with the present invention is further described below in connection with specific examples and comparative examples. In the interest of brevity and clarity, not all of the features of the invention are described in the specification, the drawings show a very close relationship to the invention and do not provide further details. The scope of the invention is not limited to the examples.
Example 1
The rare earth microalloyed high carbon chromium bearing steel resistant to chloride ion corrosion comprises the following chemical elements in percentage by mass: 0.91% of C, 1.50% of Cr, 0.30% of Mn, 0.17% of Si, 0.002% of S, 0.002% of P, 0.003% of rare earth elements (La: ce=1:1), and the balance of Fe and unavoidable impurity elements. It should be noted that the above listed chemical composition ratios refer to the content of each element in the final high carbon chromium bearing steel.
The heat treatment method of the rare earth microalloyed high carbon chromium bearing steel comprises the following steps:
(1) Firstly, spheroidizing annealing treatment is carried out; the hot-rolled rare earth bearing steel blank is firstly subjected to spheroidizing annealing treatment so as to improve the processing plasticity and cutting performance of the steel. And heating the sample to 800 ℃ along with the furnace, and preserving heat at a heating rate of 8 ℃/min. After heat preservation for 1h, cooling the sample to 500 ℃ along with the furnace, discharging the sample, and air cooling to room temperature.
(2) Sequentially removing surface oxides of the sample by using 1000-2000 # abrasive paper, and ultrasonically oscillating and cleaning the surface of the sample by using an absolute ethyl alcohol solution for 15min at 25 ℃.
(3) After spheroidizing annealing, the sample is put into a muffle furnace for austenitizing, so that the sample structure is transformed into austenite, the austenitizing temperature is 820 ℃, and the heat preservation time is 15min. The sample is heated up along with the furnace, and the heating rate is 8 ℃/min. And after the heat preservation is finished, immediately placing the sample into quenching oil for cooling, so that the tissue of the sample is transformed into martensite.
(4) After the quenching sample is cooled, an acetone solution is adopted to ultrasonically clean the quenching oil remained on the surface of the sample, and 1000 # to 2000# abrasive paper is sequentially used for polishing to remove surface oxide skin;
(5) And (3) immediately tempering after the sample is quenched, wherein the tempering temperature is 160 ℃, and the heat preservation time is 1h. The sample is heated up along with the furnace, and the heating rate is 8 ℃/min.
Example 2
The rare earth microalloyed high carbon chromium bearing steel resistant to chloride ion corrosion comprises the following chemical elements in percentage by mass: 0.98% of C, 1.52% of Cr, 0.31% of Mn, 0.17% of Si, 0.002% of S, 0.002% of P, 0.003% of rare earth elements (La: ce=1.5:1), and the balance of Fe and unavoidable impurity elements. It should be noted that the above listed chemical composition ratios refer to the content of each element in the final high carbon chromium bearing steel.
The heat treatment method of the rare earth microalloyed high carbon chromium bearing steel comprises the following steps:
(1) Firstly, spheroidizing annealing treatment is carried out; the hot-rolled rare earth bearing steel blank is firstly subjected to spheroidizing annealing treatment so as to improve the processing plasticity and cutting performance of the steel. And heating the sample to 800 ℃ along with the furnace, and preserving heat at a heating rate of 8 ℃/min. After heat preservation for 1h, cooling the sample to 500 ℃ along with the furnace, discharging the sample, and air cooling to room temperature.
(2) Sequentially removing surface oxides of the sample by using 1000-2000 # abrasive paper, and ultrasonically oscillating and cleaning the surface of the sample by using an absolute ethyl alcohol solution for 15min at 25 ℃.
(3) After spheroidizing annealing, the sample is put into a muffle furnace for austenitizing, so that the sample structure is transformed into austenite, the austenitizing temperature is 820 ℃, and the heat preservation time is 15min. The sample is heated up along with the furnace, and the heating rate is 8 ℃/min. And after the heat preservation is finished, immediately placing the sample into quenching oil for cooling, so that the tissue of the sample is transformed into martensite.
(4) After the quenching sample is cooled, an acetone solution is adopted to ultrasonically clean the quenching oil remained on the surface of the sample, and 1000 # to 2000# abrasive paper is sequentially used for polishing to remove surface oxide skin;
(5) And (3) immediately tempering after the sample is quenched, wherein the tempering temperature is 160 ℃, and the heat preservation time is 1h. The sample is heated up along with the furnace, and the heating rate is 8 ℃/min.
Example 3
The rare earth microalloyed high carbon chromium bearing steel resistant to chloride ion corrosion comprises the following chemical elements in percentage by mass: 0.97% of C, 1.50% of Cr, 0.30% of Mn, 0.18% of Si, less than or equal to 0.002% of S, less than or equal to 0.002% of P, 0.003% of rare earth element (La: ce=0.8:1) and the balance of Fe and unavoidable impurity elements. It should be noted that the above listed chemical composition ratios refer to the content of each element in the final high carbon chromium bearing steel.
The heat treatment method of the rare earth microalloyed high carbon chromium bearing steel comprises the following steps:
(1) Firstly, spheroidizing annealing treatment is carried out; the hot-rolled rare earth bearing steel blank is firstly subjected to spheroidizing annealing treatment so as to improve the processing plasticity and cutting performance of the steel. And heating the sample to 800 ℃ along with the furnace, and preserving heat at a heating rate of 8 ℃/min. After heat preservation for 1h, cooling the sample to 500 ℃ along with the furnace, discharging the sample, and air cooling to room temperature.
(2) Sequentially removing surface oxides of the sample by using 1000-2000 # abrasive paper, and ultrasonically oscillating and cleaning the surface of the sample by using an absolute ethyl alcohol solution for 15min at 25 ℃.
(3) After spheroidizing annealing, the sample is put into a muffle furnace for austenitizing, so that the sample structure is transformed into austenite, the austenitizing temperature is 820 ℃, and the heat preservation time is 15min. The sample is heated up along with the furnace, and the heating rate is 8 ℃/min. And after the heat preservation is finished, immediately placing the sample into quenching oil for cooling, so that the tissue of the sample is transformed into martensite.
(4) After the quenching sample is cooled, an acetone solution is adopted to ultrasonically clean the quenching oil remained on the surface of the sample, and 1000 # to 2000# abrasive paper is sequentially used for polishing to remove surface oxide skin;
(5) And (3) immediately tempering after the sample is quenched, wherein the tempering temperature is 160 ℃, and the heat preservation time is 1h. The sample is heated up along with the furnace, and the heating rate is 8 ℃/min.
Comparative example 1
The chemical element composition of the comparative example is basically the same as that of the example, and comprises the following chemical element compositions in percentage by mass: 0.92% of C, 1.49% of Cr, 0.29% of Mn, 0.16% of Si, less than or equal to 0.002% of S, less than or equal to 0.002% of P, and the balance of Fe and unavoidable impurity elements. The difference is that rare earth elements La and Ce are not added. It should be noted that the above listed chemical composition ratios refer to the content of each element in the final high carbon chromium bearing steel.
The heat treatment steps of the high carbon chromium bearing steel in comparative example 1 were the same as those in the examples, including the steps of:
(1) Firstly, spheroidizing annealing treatment is carried out; the hot-rolled rare earth bearing steel blank is firstly subjected to spheroidizing annealing treatment so as to improve the processing plasticity and cutting performance of the steel. And heating the sample to 800 ℃ along with the furnace, and preserving heat at a heating rate of 8 ℃/min. After heat preservation for 1h, cooling the sample to 500 ℃ along with the furnace, discharging the sample, and air cooling to room temperature.
(2) Sequentially removing surface oxides of the sample by using 1000-2000 # abrasive paper, and ultrasonically oscillating and cleaning the surface of the sample by using an absolute ethyl alcohol solution for 15min at 25 ℃.
(3) After spheroidizing annealing, the sample is put into a muffle furnace for austenitizing, so that the sample structure is transformed into austenite, the austenitizing temperature is 820 ℃, and the heat preservation time is 15min. The sample is heated up along with the furnace, and the heating rate is 8 ℃/min. And after the heat preservation is finished, immediately placing the sample into quenching oil for cooling, so that the tissue of the sample is transformed into martensite.
(4) After the quenching sample is cooled, an acetone solution is adopted to ultrasonically clean the quenching oil remained on the surface of the sample, and 1000 # to 2000# abrasive paper is sequentially used for polishing to remove surface oxide skin;
(5) And (3) immediately tempering after the sample is quenched, wherein the tempering temperature is 160 ℃, and the heat preservation time is 1h. The sample is heated up along with the furnace, and the heating rate is 8 ℃/min.
Experimental example
The examples and comparative examples were subjected to the relevant performance test, and the specific test methods and test results are as follows:
(1) Test method
Micro vickers hardness test: hardness testing was performed using an HXD-1000TMSL/LCD micro Vickers hardness tester. Before testing, the sample is sequentially ground by using 1000-2000 # sand paper, and then the surface of the sample is polished by using 1 mu m SiC polishing paste. When the hardness was measured, a load of 100gf was applied for 15s. To ensure the accuracy and repeatability of the test, the hardness values of the examples and comparative examples were calculated as averages after 5 hardness tests, respectively.
Room temperature tensile strength test: room temperature tensile test with WDW-200D-200KN universal tester at a tensile rate of 1X 10 -4 s -1 . The tensile specimen was a standard tensile specimen (GB/T228-2010) having a diameter of 5 mm. Before the test, the test specimen is ground by using 1000-2000 # sand paper, and the machining trace on the surface of the test specimen and the oxide skin remained in the heat treatment process are removed. To ensure accuracy of the test data, the examples and comparative examples were each subjected to 3-fold room temperature tensile tests.
Room temperature impact toughness test: and (5) using a JB-30B Charpy pendulum impact tester to test the room temperature impact absorption power. The test specimen was an unopened specimen with dimensions of 10mm X55 mm (GB/T229-2007). To ensure the accuracy of the data, the examples and comparative examples were repeatedly tested 3 times, respectively, and the average value was calculated and used as the room temperature impact absorption power value.
Corrosion resistance test: electrokinetic polarization curve testing was performed using a versatat 3F electrochemical workstation. The platinum sheet, silver-silver chloride (KCl saturated) electrode, and the samples in the examples and comparative examples were the counter electrode, the reference electrode, and the working electrode, respectively. The electrolyte was 0.1M NaCl solution and the test temperature was room temperature. The potential range of the potentiodynamic polarization curve test is-0.8V to-0.3V vs. Ag-AgCl, and the scanning speed is 1mV s -1 。
(2) Test results
The crystal structures of the samples of examples and comparative examples were measured using a Ultima IV X-ray diffractometer. The XRD patterns of the samples of the examples and comparative examples are shown in FIG. 1. The results show that the samples of example 1, example 2 and example 3 and the sample of comparative example 1 are single phase BCC crystal structures, indicating that the addition of rare earth elements does not cause new phases to be generated.
The microstructure and grain size distribution of the examples and comparative examples were calibrated and collected using a Zeiss Auriga FIB scanning electron microscope and an equipped xford C-Swift EBSD probe. Fig. 2 is a picture quality diagram (IQ diagram) and a grain size distribution histogram of comparative example 1 and examples 1 to 3. FIGS. 2 (a), (c), (e) and (g) show typical tempered martensite microstructure morphologies. The grain size distribution histogram shows that the addition of rare earth elements refines the grain size of the high-carbon chromium bearing steel, and the area grain size is reduced from 2.69 mu m to 2.15 mu m.
FIG. 3 shows the room temperature tensile stress displacement curves of the samples of the examples and the comparative examples. From the results, it can be seen that the samples of examples 1 to 3 have similar shapes as the comparative samples, indicating that the samples all have similar mechanical responses. It is also known from FIG. 3 that the addition of rare earth elements can increase the tensile strength of carbon-chromium bearing steel (sample tensile strength, comparative example 1:2102MPa, example 1:2103MPa, example 2:2160MPa, example 3:2203 MPa), and that the elongation thereof is also improved to some extent (displacement, comparative example 1:2.58mm, example 1:3.22mm, example 3:3.05 mm).
FIG. 4 is a bar graph showing the room temperature micro Vickers hardness of the test samples of the comparative example and the example. As can be seen, the rare earth microalloyed high carbon chromium bearing steel samples in examples 1-3 have higher hardness values than the comparative example 1 (comparative example 1:530hv, example 1:540.7hv, example 2:545hv, example 3:556.9 hv), indicating that the rare earth elements increase the micro vickers hardness values of the high carbon chromium bearing steel.
FIG. 5 is a bar graph showing the room temperature impact absorption power of the samples of comparative example 1 and examples 1 to 3. As shown in the figure, the room-temperature impact absorption power of the rare earth microalloyed high carbon chromium bearing steel is greatly improved compared with that of the sample in comparative example 1, and the improvement range is about 31% -36.7%. This suggests that the rare earth element has a beneficial effect on the room temperature impact toughness of high carbon chromium bearing steels.
The corrosion performance test was performed in 0.1M NaCl solution at room temperature. Electrokinetic polarization curves of examples 1-3 and comparative example 1, respectively, were tested using an Ametek versatat 3F electrochemical workstation, and the results are shown in fig. 6. From the curves, the samples in examples 1 to 3 have a higher corrosion potential and a lower corrosion current density than the sample in comparative example 1, indicating that the addition of the rare earth element increases the corrosion resistance of the high carbon chromium bearing steel in 0.1M NaCl solution. After fitting, example 1 is over-heatedThe corrosion potential of the rare earth microalloyed high carbon chromium bearing steel sample in 3 is-553.2 mV, -543.3mV, -538.2mV vs. Ag-AgCl respectively, and compared with the sample in comparative example 1, the corrosion potential of the rare earth microalloyed high carbon chromium bearing steel sample in 3 is greatly improved (-584.1 mV vs. Ag-AgCl). Meanwhile, the corrosion current density of the rare earth microalloyed high carbon chromium bearing steel in examples 1 to 3 is obviously reduced compared with that of the sample in comparative example 1 (comparative example 1:6.82 mu A cm -2 Example 1:5.35 mu A cm -2 Example 2:4.80 mu A cm -2 Example 3:5.11 mu A cm -2 )。
In summary, compared with comparative example 1, examples 1 to 3 have improved strength, hardness and toughness and improved comprehensive properties of high-carbon chromium bearing steel after rare earth elements are added; has higher corrosion potential and lower corrosion current density in 0.1M NaCl solution, and shows better corrosion resistance to chloride ions.
Claims (12)
1. The rare earth microalloyed high carbon chromium bearing steel resistant to chloride ion corrosion is characterized by comprising, by mass, 0.91-1.02% of C, 1.49-1.60% of Cr, 0.28-0.45% of Mn, 0.17-0.34% of Si, less than or equal to 0.003% of S, less than or equal to 0.003% of P, 0.003% of rare earth elements, and the balance of Fe and unavoidable impurity elements in sequence;
the added rare earth elements are La and Ce, and the proportion of La is: ce=0.8: 1-1.5: 1.
2. the rare earth microalloyed high carbon chromium bearing steel resistant to corrosion by chloride ions according to claim 1, wherein the heat treatment condition is a quenched, low temperature tempered condition, wherein the quenching temperature is 820 ℃, the tempering temperature is 160 ℃, and the tempering time is 1h.
3. The rare earth micro-alloyed high-carbon chromium bearing steel resistant to chloride ion corrosion according to claim 1, wherein the rare earth high-carbon chromium bearing steel has a fine grain size of 2.15-2.58 μm.
4. The rare earth micro-alloyed high-carbon chromium bearing steel resistant to corrosion by chlorine ions according to claim 1, wherein the rare earth high-carbon chromium bearing steel has a higher micro vickers hardness and a hardness value of 556.9HV.
5. The rare earth micro-alloyed high-carbon chromium bearing steel resistant to corrosion by chlorine ions according to claim 1, wherein the rare earth high-carbon chromium bearing steel has higher room-temperature impact toughness and has an impact absorption power of 99.3J.
6. The rare earth micro-alloyed high-carbon chromium bearing steel resistant to corrosion by chlorine ions according to claim 1, wherein the rare earth high-carbon chromium bearing steel has a Cl of 0.1M - In solution, the bearing steel has higher corrosion potential and lower corrosion current density compared with bearing steel without rare earth.
7. The rare earth micro-alloyed high-carbon chromium bearing steel resistant to corrosion by chlorine ions according to any one of claims 1-6, wherein the heat treatment process route of the rare earth micro-alloyed high-carbon chromium bearing steel is as follows:
(1) Before quenching the sample, spheroidizing annealing treatment is carried out firstly;
(2) Removing surface oxide by using sand paper, and cleaning the surface of a sample by adopting ultrasonic vibration;
(3) Putting the sample into a muffle furnace for austenitizing quenching;
(4) Cleaning the quenching oil remained on the surface of the sample, and removing surface oxide skin;
(5) Tempering is carried out immediately after quenching is completed.
8. The rare earth microalloyed high carbon chromium bearing steel resistant to corrosion by chloride ions according to claim 7, wherein in the step (1), the sample is heated up along with the furnace at a heating rate of 8 ℃/min, the temperature is raised to 800 ℃, the temperature is kept for 1h, and after the temperature is kept, the sample is cooled down to 500 ℃ along with the furnace and then is cooled down to room temperature.
9. The rare earth microalloyed high carbon chromium bearing steel resistant to chloride ion corrosion according to claim 7, wherein in the step (2), samples are polished sequentially by 100-2000 # sand paper, and are subjected to ultrasonic vibration cleaning in an absolute ethanol solution for 15min at a temperature of 25 ℃.
10. The rare earth microalloyed high carbon chromium bearing steel according to claim 7, wherein in the step (3), the austenitizing temperature is 820 ℃, the sample is heated along with the furnace, the heating rate is 8 ℃/min, the temperature is kept for 15min, and after the temperature is kept, the sample is immediately cooled and quenched by quenching oil.
11. The rare earth microalloyed high carbon chromium bearing steel resistant to chloride ion corrosion according to claim 7, wherein in the step (4), an acetone solution is used for ultrasonic cleaning of a sample for 15min at a temperature of 25 ℃, and oxide skin on the surface of the sample is sequentially polished and removed by using 1000-2000 # abrasive paper.
12. The rare earth microalloyed high carbon chromium bearing steel resistant to corrosion by chloride ions according to claim 7, wherein in the step (5), the tempering temperature is 160 ℃, the heat preservation time is 1h, the sample is heated along with the furnace, the heating rate is 8 ℃/min, and after the heat preservation is finished, the sample is cooled to room temperature in air.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211388606.8A CN115558867B (en) | 2022-11-08 | 2022-11-08 | Rare earth microalloyed high carbon chromium bearing steel resistant to chloride ion corrosion |
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| CN104032221B (en) * | 2014-03-18 | 2016-07-06 | 北京科技大学 | A kind of Nb-microalloying high-carbon-chromium bearing steel and hot rolling production method thereof |
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