CN101942632B - Gas nitriding process of 00Ni18Co8Mo5AlTi high-strength maraging steel - Google Patents
Gas nitriding process of 00Ni18Co8Mo5AlTi high-strength maraging steel Download PDFInfo
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- CN101942632B CN101942632B CN2010102903315A CN201010290331A CN101942632B CN 101942632 B CN101942632 B CN 101942632B CN 2010102903315 A CN2010102903315 A CN 2010102903315A CN 201010290331 A CN201010290331 A CN 201010290331A CN 101942632 B CN101942632 B CN 101942632B
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- 238000005121 nitriding Methods 0.000 title claims abstract description 92
- 238000000034 method Methods 0.000 title claims abstract description 31
- 229910001240 Maraging steel Inorganic materials 0.000 title abstract 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 39
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 22
- 239000010959 steel Substances 0.000 claims abstract description 22
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 19
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 16
- 235000019270 ammonium chloride Nutrition 0.000 claims abstract description 10
- 239000007789 gas Substances 0.000 claims description 19
- 230000032683 aging Effects 0.000 claims description 17
- 238000005516 engineering process Methods 0.000 claims description 17
- 229910000734 martensite Inorganic materials 0.000 claims description 17
- 238000010494 dissociation reaction Methods 0.000 claims description 10
- 230000005593 dissociations Effects 0.000 claims description 10
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- 239000004576 sand Substances 0.000 claims description 5
- 239000000377 silicon dioxide Substances 0.000 claims description 5
- 238000009413 insulation Methods 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 3
- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- 239000012299 nitrogen atmosphere Substances 0.000 claims description 2
- 239000007858 starting material Substances 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 abstract description 10
- 238000004140 cleaning Methods 0.000 abstract description 2
- 238000000354 decomposition reaction Methods 0.000 abstract description 2
- 239000006004 Quartz sand Substances 0.000 abstract 1
- 238000001035 drying Methods 0.000 abstract 1
- 238000004321 preservation Methods 0.000 abstract 1
- 239000002994 raw material Substances 0.000 abstract 1
- 238000005488 sandblasting Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 11
- 238000009434 installation Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000007669 thermal treatment Methods 0.000 description 4
- 125000004433 nitrogen atom Chemical group N* 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000754 Wrought iron Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
The invention discloses a gas nitriding process of 00Ni18Co8Mo5AlTi high-strength maraging steel, which specifically comprises the following steps: carrying out solution treatment on the raw materials, and then processing the parts to the size of a finished product; laying ammonium chloride and quartz sand which are dried and uniformly mixed at the bottom of a nitriding tank; cleaning the 00Ni18Co8Mo5AlTi steel parts with oil stains and drying the parts; performing sand blasting treatment on the part before nitriding; introducing ammonia gas to drive the air in the box to the greatest extent after the parts are boxed and sealed, and raising the temperature along with the furnace when the ammonia decomposition rate in the box is zero to carry out nitriding treatment by a two-stage method; when the nitriding heat preservation is finished, the power supply of the heating furnace is disconnected, air is continuously supplied to maintain the positive pressure in the nitriding box, and the nitriding box is moved out of the heating furnace when the nitriding box is cooled to below 300 ℃ along with the temperature reduction of the furnace and is cooled in the air; and stopping gas supply and taking out the nitrided parts when the temperature of the nitriding box is reduced to below 150 ℃. By adopting the invention, the size and shape distortion of the nitriding part is small, the core part has excellent strength, plasticity and toughness, and the wear resistance and fatigue resistance of the surface are obviously improved.
Description
Technical field
The present invention relates to a kind of nitriding heat treatment process of high strength martensitic aging steel, particularly the gas nitriding technology of 00Ni18Co8Mo5AlTi material.
Background technology
Nitriding thermal treatment is that active nitrogen-atoms is infiltrated piece surface, forms the extremely hard alloy nitride of one deck, to improve hardness, wear resistance and the erosion resistance on top layer.The process method of nitriding mainly comprises gas nitriding, liquid nitriding and ionitriding etc., and wherein gas nitriding is occupied an leading position.Nitriding is handled and under 460～650 ℃, is carried out usually, and its biggest advantage is to ooze the back part to distort little.At present, the steel grade of nitriding processing mainly comprises structural alloy steel and various stainless steel.
00Ni18Co8Mo5AlTi is a kind of high strength martensitic aging steel, and it has good mechanical property, and after the solution treatment, its microstructure is Ultra-low carbon, nickelic single-phase martensite; After the ageing treatment, separate out in the intermetallic compound of martensitic range deposition, refinement and disperse, make material be able to strengthen, its intensity, plasticity and toughness good match are mainly used in essential industry fields such as aerospace, petrochemical complex and nuclear power.Blemish in an otherwise perfect thing be that the same with other plow-steels, the fatigue strength of this material is on the low side.In recent years, the research that is intended to improve surperficial fatigue resistance concentrates on mainly that shot blasting on surface is handled and aspect such as surface-treated thermal treatment.Wherein, Nitriding is handled and is undoubtedly a kind of selection preferably, but because the surface of this material has one deck to hinder the passive film that activated nitrogen atom infiltrates, adopts the nitriding method of routine; Can't form effective nitrided case, the gas nitriding technology that is used for the 00Ni18Co8Mo5AlTi material still belongs to blank.
Summary of the invention
In order to adopt surface-treated thermal treatment to improve the surperficial fatigue resistance of high strength martensitic aging steel; The gas nitriding technology that the purpose of this invention is to provide a kind of 00Ni 18Co8Mo5AlTi high strength martensitic aging steel; Adopt this gas nitriding technology; The distortion of nitriding accessory size and shape is little, and heart portion has good intensity, plasticity and toughness, and significantly improves the wear resistance and the fatigue resistence on surface.
The objective of the invention is to realize through following technical scheme:
A kind of gas nitriding technology of 00Ni18Co8Mo5AlTi high strength martensitic aging steel is characterized in that this technology follows these steps to carry out:
1) starting material are carried out solution treatment, then with part processing to final dimension;
2) at the bottom of the nitriding case, spread through ammonium chloride and silica sand dry and that mix;
3) the 00Ni18Co8Mo5AlTi steel components is cleaned greasy dirt and dry up;
4) part before the nitriding being carried out blast handles;
5) the logical ammonia in part vanning sealing back is caught up with air in the most case, when the ammonia dissociation rate in the case is " zero ", heats up with stove, carries out the two-phase method nitriding and handles;
6) nitriding insulation is at the end broken off the process furnace power supply, continues air feed and keeps malleation in the nitriding case, and when being cooled to below 300 ℃ with the stove cooling, the nitriding case is shifted out process furnace, in air, cools off; When the temperature of treating the nitriding case is reduced to below 150 ℃, stop air feed and take out the nitriding part.
Step 2 of the present invention) in, the ratio of ammonium chloride and silica sand can be 1: 5, and ammonium chloride placement amount is calculated by the long-pending 100～150g/m3 of nitriding casing.In the step 3), the 00Ni18Co8Mo5AlTi steel components is cleaned greasy dirt with gasoline and acetone and dried up.In the step 4); Control air pressure is not more than 0.15MPa, the part before using 200～250 purpose emergies to nitriding carries out blast and handles; Part behind the blast should be cased immediately and forbid and directly touched with hand, and the timed interval of blast and vanning must not be above 1 hour.
Need before the nitriding of the present invention carry out solution treatment to material in advance, then with part processing to final dimension, adopt common chamber type electric resistance furnace as heating installation, carry out the two-phase method nitriding at aging temp interval (480～510 ℃) and handle.
Carrying out the two-phase method nitriding by following processing parameter handles:
(1) holding temperature: 500 ± 5 ℃, be incubated 3～4.5 hours, ammonia dissociation rate: 20～30%
(2) holding temperature: 505 ± 5 ℃, be incubated 45～75 hours, ammonia dissociation rate: 65～85%.
In the nitriding process, the unimpeded of intake and exhaust pipeline be should remain, temperature, gaseous tension and an ammonia dissociation rate whenever measured at a distance from 30 minutes.
Nitriding insulation of the present invention at the end behind the disconnection process furnace power supply, continues logical ammonia or feeds nitrogen atmosphere in the case is replaced, and keeps malleation in the nitriding case, to prevent the part oxidation.
Because the 00Ni18Co8Mo5AlTi material is prone to form fine and close passive film under normal conditions, hinders the infiltration of activated nitrogen atom.The present invention takes before nitriding, part to be carried out the method that blast is handled, in nitriding process, added ammonium chloride, urges the effect of oozing to promote surface active and to reach.
Adopt the gas nitriding technology of 00Ni18Co8Mo5AlTi high strength martensitic aging steel of the present invention, the distortion of nitriding accessory size and shape is little, and heart portion has good intensity, plasticity and toughness, and significantly improves the wear resistance and the fatigue resistence on surface.Nitrided case depth is 0.08～0.20mm, and layer surface hardness is not less than 700HV, and centre hardness is 49～52HRC, and its performance satisfies the demand of some Aeronautics and Astronautics with high strength driving shaft and gear.
Embodiment
A kind of gas nitriding technology of 00Ni18Co8Mo5AlTi high strength martensitic aging steel of the present invention is that the gear of 00Ni18Co8Mo5AlTi carries out nitriding and handles to material, and during production, by every batch of 20 gears, 3 totally batches are carried out nitriding respectively and handle:
1, get the rod iron that same buying batch, material are 00Ni18Co8Mo5AlTi (φ 35mm * 200mm), carry out solution treatment:
Heating installation: chamber type electric resistance furnace Heating temperature: 820 ± 10 ℃
Soaking time: 70～90 minutes types of cooling: air cooling
2, with all Gear Processing to final dimension, other learnt from else's experience material of solid solution, every lots processed is used for 2 of the thermal treatment test specimens of stove nitriding, test specimen is of a size of: φ 32mm * φ 15mm * 10mm (external diameter * internal diameter * highly).
3, be ready to heating installation and nitriding case, nitriding process furnace (chamber type electric resistance furnace) should be equipped with temperature and regulate registering instrument and warning device automatically, and instrument, instrument and thermopair should be at accreditation in the phases.Before the nitriding, reply nitriding process furnace, nitriding case and intake and exhaust pipeline are cleared up, and get rid of dirt and lime-ash.
4, get a cleaning, exsiccant nitriding case for every batch, chemical pure anhydrous ammonium chloride of 10g and 50g are carried out thorough mixing through the silica sand of oven dry processing, and be layered on nitriding case bottom equably.
5, successively clean greasy dirt and dry up with every batch gear with stove nitriding test specimen with gasoline and acetone; Control air pressure is not more than 0.15MPa, uses 200～250 purpose emergies that it is carried out the blast processing; Part behind the blast and test specimen should be cased immediately and forbid and directly touched with hand, and the timed interval of blast and vanning must not be above 1 hour.
6, part vanning sealing back feeds ammonia, when the ammonia dissociation rate in the case is measured as " zero ", the nitriding case is packed into heat up with stove in the process furnace, and the gear of each batch carries out two-phase method nitriding processing by the processing parameter of table 1:
Each batch of table 1 Nitriding on Gear treatment process parameter
7, in the nitriding process, the ammonium chloride of use is through heating, when decomposition is discharged by exhaust passage, being attached on the tube wall because pipe temperature reduces generation chemical reaction formation powder in the nitriding case, and the easy blocking gas exhaust duct is so answer the unimpeded of constantly checked gas exhaust duct.In addition, whenever did the inspection of a project such as temperature, gaseous tension and ammonia dissociation rate, and carry out associated note at a distance from 30 minutes.
8, nitriding insulation is at the end broken off the process furnace power supply, continues logical ammonia keeping malleation in the nitriding case, and with stove cooling cooling.When under protection of ammonia, being cooled to below 300 ℃, the nitriding case is shifted out process furnace, in air, cool off (continue keep malleation in the case this moment, to prevent the part oxidation).When the temperature of treating the nitriding case is reduced to below 150 ℃, stop to supply ammonia and take out nitriding gear and test specimen.
So far, the gas nitriding that the 00Ni18Co8Mo5AlTi gear is carried out disposes, and after to nitriding, tests with the stove test specimen, produces a desired effect, and the assay of each batch gear is as shown in table 2:
Each batch of table 2 Nitriding on Gear result
The present invention only need adopt common chamber type electric resistance furnace as heating installation, and practicality is good, process method is simple, is easy to promote, and goes for other high strength martensitic aging steels.During application, can select different parameter, satisfy corresponding heat treatment technics requirement according to concrete material.
Claims (6)
1. the gas nitriding technology of a 00Ni18Co8Mo5AlTi high strength martensitic aging steel is characterized in that this technology follows these steps to carry out:
1) starting material are carried out solution treatment, then with part processing to final dimension;
2) at the bottom of the nitriding case, spread through ammonium chloride and silica sand dry and that mix;
3) the 00Ni18Co8Mo5AlTi steel components is cleaned greasy dirt and dry up;
4) part before the nitriding being carried out blast handles;
5) the logical ammonia in part vanning sealing back is caught up with air in the most case, when the ammonia dissociation rate in the case is " zero ", heats up with stove, carries out the two-phase method nitriding and handles; Carrying out the two-phase method nitriding by following processing parameter handles:
(1) holding temperature: 500 ± 5 ℃, be incubated 3～4.5 hours, ammonia dissociation rate: 20～30%
(2) holding temperature: 505 ± 5 ℃, be incubated 45～75 hours, ammonia dissociation rate: 65～85%;
6) nitriding insulation is at the end broken off the process furnace power supply, continues air feed and keeps malleation in the nitriding case, and when being cooled to below 300 ℃ with the stove cooling, the nitriding case is shifted out process furnace, in air, cools off; When the temperature of treating the nitriding case is reduced to below 150 ℃, stop air feed and take out the nitriding part.
2. the gas nitriding technology of 00Ni18Co8Mo5AlTi high strength martensitic aging steel according to claim 1 is characterized in that: step 2) in, the ratio of ammonium chloride and silica sand is 1: 5, ammonium chloride placement amount is by the long-pending 100～150g/m of nitriding casing
3Calculate.
3. the gas nitriding technology of 00Ni18Co8Mo5AlTi high strength martensitic aging steel according to claim 1 is characterized in that; In the step 3), the 00Ni18Co8Mo5AlTi steel components is cleaned greasy dirt with gasoline and acetone and dried up.
4. the gas nitriding technology of 00Ni18Co8Mo5AlTi high strength martensitic aging steel according to claim 1; It is characterized in that: in the step 4); Control air pressure is not more than 0.15MPa, the part before using 200～250 purpose emergies to nitriding carries out blast and handles; Part behind the blast should be cased immediately and forbid and directly touched with hand, and the timed interval of blast and vanning must not be above 1 hour.
5. the gas nitriding technology of 00Ni18Co8Mo5AlTi high strength martensitic aging steel according to claim 1; It is characterized in that: in the step 5); In the nitriding process, remain the unimpeded of intake and exhaust pipeline, whenever measured temperature, gaseous tension and an ammonia dissociation rate at a distance from 30 minutes.
6. the gas nitriding technology of 00Ni18Co8Mo5AlTi high strength martensitic aging steel according to claim 1 is characterized in that: in the step 6), continue logical ammonia or feed nitrogen atmosphere in the case is replaced, to keep malleation in the nitriding case.
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| CN102517541B (en) * | 2011-12-19 | 2013-07-10 | 台州市百达热处理有限公司 | Gas nitriding treatment method of 11Cr17 stainless steel slip sheet |
| CN103774086A (en) * | 2014-01-16 | 2014-05-07 | 燕山大学 | Two-section rapid gas nitriding method for middle-carbon and low-carbon alloy structural steel |
| CN104250720B (en) * | 2014-09-15 | 2016-07-27 | 哈尔滨汽轮机厂有限责任公司 | A kind of method shortening the structural alloy steel gas nitriding technique time |
| CN108747233B (en) * | 2018-05-04 | 2019-11-08 | 宁波市鄞州兴韩机械实业有限公司 | A kind of processing technology of mechanical main shaft |
| CN109338280B (en) * | 2018-11-21 | 2021-11-05 | 中国航发哈尔滨东安发动机有限公司 | Nitriding method after third-generation carburizing steel |
| CN109182696B (en) * | 2018-11-21 | 2021-11-05 | 中国航发哈尔滨东安发动机有限公司 | Nitriding surface modification method for third-generation carburized steel material |
| CN109778108B (en) * | 2019-01-31 | 2020-09-29 | 中国航发动力股份有限公司 | Nitriding method for Fe-Ni-Cr series high-temperature alloy |
| CN111500969A (en) * | 2020-04-30 | 2020-08-07 | 海门金锋盛厨房设备有限公司 | Nitriding treatment system and nitriding treatment method for oil-stain-resistant stainless steel |
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| JPH05222512A (en) * | 1991-09-05 | 1993-08-31 | Aimetsukusu Kk | Method for high temperature nitriding treatment by which wear resistance in austenitic stainless steel improves and its application |
| CN1073490A (en) * | 1991-12-19 | 1993-06-23 | 航空航天工业部南方动力机械公司 | A kind of no nitride layer (bright layer) gas nitriding technology |
| JP2916751B2 (en) * | 1995-09-08 | 1999-07-05 | 鹿児島県 | Method for nitriding surface of austenitic stainless steel |
| CN100392143C (en) * | 2005-09-29 | 2008-06-04 | 上海汽轮机有限公司 | Nitriding heat treatment process of high temperature alloy material |
| CN101649441B (en) * | 2008-08-12 | 2011-07-27 | 贵州红林机械有限公司 | Process method for nitriding austenitic stainless steel material |
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