CN111534772A - Preparation method of TC4 titanium alloy finished bar with short process and low cost - Google Patents
Preparation method of TC4 titanium alloy finished bar with short process and low cost Download PDFInfo
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Abstract
The invention discloses a preparation method of a TC4 titanium alloy finished bar with short process and low cost, which comprises the steps of heating and insulating a TC4 titanium alloy ingot above a phase transformation point, performing one-fire-time multi-pass precision forging to cogging, blanking, heating below the phase transformation point, performing one-fire-time multi-pass machining to forge into an intermediate blank, and then heating below the phase transformation point, performing one-fire-time multi-pass rolling to obtain a finished product. The preparation method of the TC4 titanium alloy finished bar with short flow and low cost avoids the problems of multiple fire times, multiple polishing times, large intangible loss, high processing cost and long processing period of the traditional processing technique; meanwhile, by combining the precision forging and rolling technologies, the requirements on refining the surface and core tissues of the finished bar simultaneously are met, the tissues are fully crushed, the finished bar is fine and uniform, the processed bar tissue meets the requirements of ETTC 2A 6, the yield strength is more than or equal to 830MPa, the elongation is 15%, and the reduction of area is 35%.
Description
Technical Field
The invention belongs to the technical field of non-ferrous metal material processing technologies, and particularly relates to a short-process low-cost preparation method of a TC4 titanium alloy finished bar.
Background
The titanium alloy is an important structural metal developed in the 50 th century, and is widely applied in the fields of aerospace, marine chemical industry, biomedical treatment and the like due to the high strength, strong corrosion resistance, no magnetism, potential corrosion similar to that of composite materials and the like, wherein TC4 (including TC4, TC4ELI, TC4-DT, Ti6Al4V, Ti6Al4VELI and the like) is the titanium alloy with the largest finished product yield and the widest application. However, titanium alloy has poor plasticity and high temperature sensitivity, so that the processing window is narrow, the processing difficulty is high, multiple-fire free forging and polishing are needed after ingot casting cogging, the processing cost is high, the period is long, the material loss is large, and the comprehensive cost is high.
Disclosure of Invention
The invention aims to provide a short-flow low-cost preparation method of a TC4 titanium alloy finished bar, which solves the problems of long working procedure, high processing cost and low yield of the existing processing technology.
The technical scheme adopted by the invention is as follows: a short-process low-cost TC4 titanium alloy finished bar is prepared through heating TC4 titanium alloy ingot above phase transformation point, holding temp, forging to form blank, blanking, heating below phase transformation point, forging to form intermediate bar, and heating below phase transformation point.
The present invention is also characterized in that,
the method specifically comprises the following steps:
step 1, ingot heating
Selecting a TC4 titanium alloy ingot, heating to a temperature above a phase transition point by using a box-type heating furnace in an atmospheric atmosphere, and preserving heat;
step 2, ingot cogging and forging
Forging the TC4 titanium alloy ingot heated in the step 1 by using a precision forging machine, and air-cooling and blanking after forging to obtain a first bar blank;
step 3, heating the first bar blank
Heating the first bar blank obtained in the step (2) to a temperature below the phase change point by using a box type heating furnace in an atmospheric atmosphere and preserving heat;
step 4, forging the first bar blank
Forging the first bar blank heated in the step 3 by using a precision forging machine, and air-cooling and blanking after forging to obtain a second bar blank;
Heating the second bar blank obtained in the step (4) to a temperature below the phase change point by using a box type heating furnace in an atmospheric atmosphere and preserving heat;
step 6, rolling the second bar blank
Rolling the second bar stock heated in the step 5 by using a rolling mill, and then air-cooling to obtain a finished bar stock;
step 7, heat treatment of finished bar blank
And (4) carrying out heat treatment on the finished bar blank obtained in the step (6) in an atmosphere by using a heat treatment furnace to obtain the TC4 titanium alloy finished bar.
The TC4 titanium alloy ingot in the step 1 comprises one of TC4, TC4ELI, TC4-DT, Ti6Al4V or Ti6Al4 VELI; the specification of the TC4 titanium alloy ingot in the step 1 is phi 500-phi 950 mm.
The heating temperature of the titanium alloy ingot in the step 1 is Tβ+100～Tβ+250 ℃ wherein, TβIs TC4 titanium alloy phase-change point temperature; the heat preservation time is 4-12 h.
In the step 2, the pass of forging by using the precision forging machine is 3-7 passes, the specification of the first bar blank obtained by forging is phi 350mm, the pass deformation is 30-200 mm, and the precision forging accumulated deformation is 51.0-86.4%.
The heating temperature of the first bar blank in the step 3 is Tβ-150～Tβ-30 ℃ of which T isβIs TC4 titanium alloy phase-change point temperature; the heat preservation time is 3-10 h.
In the step 4, the pass of forging by using the precision forging machine is 3-5 passes, the specification of the second bar blank obtained by forging is phi 160mm, the pass deformation is 20-100 mm, and the precision forging accumulated deformation is 79.1%.
The heating temperature of the second bar blank in the step 5 is Tβ-150～Tβ-30 ℃ of which T isβIs TC4 titanium alloy phase-change point temperature; the heat preservation time is 2-8 h.
And 6, rolling by using a rolling mill for 6-16 passes, wherein the size of the finished bar blank obtained by rolling is phi 50-phi 100mm, and the rolling accumulated deformation is 60.9-90.2%.
And (4) performing heat treatment on the finished bar blank in the step (7), wherein the heat preservation temperature is 700-800 ℃, and the heat preservation time is 1-2 hours.
The invention has the beneficial effects that: the preparation method of the TC4 titanium alloy finished bar with short flow and low cost avoids the problems of multiple fire times, multiple polishing times, large intangible loss, high processing cost and long processing period of the traditional processing technique; meanwhile, through the combination of the precision forging and rolling technologies, the requirements of simultaneously refining the surface and core tissues of the finished bar are met, the tissues are fully crushed, and the finished bar is processed uniformly, wherein the processed bar tissues meet ETTC 2A 6, the yield strength is not less than 830MPa, the elongation is 15%, the reduction of area is 35%, and the standard requirements of AMS4928, ISO5832, GB/T2965, GB/T13810 and the like are met.
Drawings
FIG. 1 is a low-magnification diagram of the transverse structure of a finished bar of TC4 with a diameter of 100mm prepared in example 1 of the preparation method of a short-flow low-cost TC4 titanium alloy finished bar of the present invention;
FIG. 2 is a high-magnification diagram of the transverse structure of a finished bar of TC4 with a diameter of 100mm prepared in example 1 of the preparation method of a short-flow low-cost TC4 titanium alloy finished bar of the present invention;
FIG. 3 is a cross-sectional microstructure low-magnification view of a phi 50mm Ti6Al4V bar prepared by the short-process low-cost TC 4-type titanium alloy finished bar prepared by the method of example 2;
FIG. 4 is a high magnification view of the transverse structure of a phi 50mm Ti6Al4V bar prepared by the short-process low-cost TC4 titanium alloy finished bar preparation method of example 2 of the present invention;
fig. 5 is a diagram of mechanical properties of the TC4 titanium alloy bars in an annealed state at room temperature, which are respectively prepared in examples 1, 2 and 3 of a short-flow low-cost TC4 titanium alloy finished bar according to the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention provides a preparation method of a TC4 titanium alloy finished bar with a structure meeting ETTC 2A 6, a yield strength of more than or equal to 830MPa, an elongation of 15% and a reduction of area of 35%, which has a short process and low cost, and is implemented according to the following steps:
step 1, ingot casting heating:
selecting an ingot with the specification of (phi 500-phi 950) mmTC4, heating to the temperature of (100-250) DEG C above the phase transition point, namely T, by using a box type heating furnace in an atmospheric atmosphereβHeating to 100-250 deg.C, and keeping the temperature for 4-12 h;
step 2, ingot cogging and forging
Forging the titanium alloy ingot heated in the step 1 by using a precision forging machine, wherein the forging pass is 3-7 passes, the specification phi of the forged ingot is 350mm, the pass deformation (30-200) mm, the precision forging accumulated deformation is 51.0-86.4%, and blanking is performed after forging;
step 3, heating the blank
Heating the bar blank processed in the step 2 by adopting a box type heating furnace in an atmosphere, wherein the temperature is below (30-150) DEG C (namely T) of the phase transition pointβAnd (5) keeping the temperature at minus 30-150 ℃ for 3-10 hours after the temperature is raised.
Step 4, blank forging
Forging the bar blank heated in the step 3 by using a precision forging machine, wherein the forging pass is 3-5 passes, the specification phi is 160mm after forging, the pass deformation (20-100) mm, the precision forging accumulated deformation is 79.1%, and blanking is performed after forging;
Heating the bar blank processed in the step 4 by adopting a box type heating furnace in the atmosphere, wherein the temperature is below (30-150) DEG C (namely T) of the phase transition pointβThe temperature is controlled to be (30-150) DEG C, and the temperature is kept for 2-8 hours after the temperature is raised;
step 6, rolling finished products
Rolling the bar stock heated in the step 5 by using a rolling mill, wherein the size of the rolled bar stock is phi 50-phi 100mm, the rolling pass is 6-16, and the accumulated rolling deformation is 60.9-90.2%;
step 7, heat treatment of finished product
And (4) carrying out heat treatment on the finished bar blank rolled in the step (6) by using a heat treatment furnace, wherein the heat preservation temperature is 700-800 ℃, and the heat treatment is carried out in the atmosphere for 1-2 h.
Through the way, the preparation method of the short-flow low-cost TC4 (containing TC4, TC4ELI, TC4-DT, Ti6Al4V, Ti6Al4VELI and the like) titanium alloy finished bar with the structure meeting the grade of ETTC 2A 6, the yield strength being more than or equal to 830MPa, the elongation being 15% and the reduction of area being 35% is characterized in that a TC4 cast ingot is heated to the phase transformation point (T) by a box furnaceβ) Keeping the temperature for a certain time, discharging the blank from the furnace, performing precision forging and cogging by adopting a precision forging machine to obtain an intermediate blank with a certain specification, heating the blank below a phase change point after downward cutting, performing precision forging and rolling to obtain a finished product, wherein the obtained finished product has good batch consistency and stability; and the process flow is simple, the processing period is short, and the material utilization rate is high.
Example 1
Step 1, ingot casting heating:
selecting cast ingot with the specification of phi 950mmTC4ELI, heating to the temperature of 250 ℃ above the phase transition point, namely T, by adopting a box type heating furnace in atmospheric atmosphereβ+250 ℃, and keeping the temperature for 12 hours after reaching the temperature;
step 2, ingot cogging and forging
Forging the titanium alloy ingot heated in the step 1 by using a precision forging machine, wherein the forging pass is 7 passes, the specification phi of the forged ingot is 350mm, the pass deformation is 200mm, 100mm, 80 mm, 50mm, 40 mm and 30mm in sequence, the accumulated precision forging deformation is 86.4%, and blanking is performed after forging;
step 3, heating the blank
Heating the bar blank processed in the step 2 by adopting a box type heating furnace in the atmosphere, wherein the heating temperature is 30 ℃ below the phase transition point, namely TβKeeping the temperature for 10 hours after reaching the temperature of minus 30 ℃;
step 4, blank forging
Forging the bar stock heated in the step 3 by using a precision forging machine, wherein the forging pass is 5 passes, the forged specification phi is 160mm, the pass deformation is 100mm, 30mm, 20mm and 20mm in sequence, the precision forging accumulated deformation is 79.1 percent, and blanking is performed after forging;
Heating the bar blank processed in the step 4 by adopting a box type heating furnace in the atmosphere, wherein the temperature is 30 ℃ below the phase transition point, namely TβKeeping the temperature for 8 hours after the temperature reaches minus 30 ℃;
step 6, rolling finished products
Rolling the bar stock heated in the step 5 by using a rolling mill, wherein the size of the rolled bar stock is phi 100mm, and the accumulated rolling deformation is 60.9% in 6 passes;
step 7, heat treatment of finished product
And (4) carrying out heat treatment on the finished bar blank rolled in the step (6) by using a heat treatment furnace, wherein the heat preservation temperature is 800 ℃, the heat treatment is carried out in the atmosphere, and the heat preservation time is 2 hours.
Example 2
Step 1, ingot casting heating:
selecting cast ingot with specification of phi 500mmTC4, heating to 100 ℃ above the phase transition point by a box type heating furnace in atmospheric atmosphere, namely Tβ+100 ℃, and keeping the temperature for 4 hours after reaching the temperature;
step 2, ingot cogging and forging
Forging the titanium alloy ingot heated in the step 1 by using a precision forging machine, wherein the forging pass is 3 passes, the specification phi of the forged ingot is 350mm, the pass deformation is 80 mm, 40 mm and 30mm in sequence, the precision forging accumulated deformation is 51.0 percent, and blanking is performed after forging;
step 3, heating the blank
Heating the bar blank processed in the step 2 by adopting a box type heating furnace in the atmosphere, wherein the temperature is 30 ℃ below the phase transition point, namely TβKeeping the temperature for 3h after reaching the temperature of 150 ℃ below zero;
step 4, blank forging
Forging the bar stock heated in the step 3 by using a precision forging machine, wherein the forging pass is 3 passes, the forged specification phi is 160mm, the pass deformation is 100mm, 70 mm and 20mm in sequence, the precision forging accumulated deformation is 79.1 percent, and blanking is performed after forging;
Heating the bar blank processed in the step 4 by adopting a box type heating furnace in the atmosphere, wherein the temperature is 150 ℃ below the phase transition point, namely TβKeeping the temperature for 2h after reaching the temperature of 150 ℃ below zero;
step 6, rolling finished products
Rolling the bar stock heated in the step 5 by using a rolling mill, wherein the size of the rolled bar stock is phi 50mm, the rolling pass is 16, and the accumulated rolling deformation is 90.2%;
step 7, heat treatment of finished product
And (4) carrying out heat treatment on the finished bar blank rolled in the step (6) by using a heat treatment furnace, wherein the heat preservation temperature is 700 ℃, the heat treatment is carried out in the atmosphere, and the heat preservation time is 1 h.
Example 3
Step 1, ingot casting heating:
selecting cast ingots with the specification of phi 700mmTi6Al4V, and heating the cast ingots to the temperature of 170 ℃ above the phase transformation point, namely T, by adopting a box type heating furnace in atmospheric atmosphereβ+170 ℃, and keeping the temperature for 8 hours after reaching the temperature;
step 2, ingot cogging and forging
Forging the titanium alloy ingot heated in the step 1 by using a precision forging machine, wherein the forging pass is 5 passes, the specification phi of the forged ingot is 350mm, the pass deformation is 200mm, 40 mm and 30mm in sequence, the accumulated precision forging deformation is 75.0%, and blanking is performed after forging;
step 3, heating the blank
The bar stock processed by the step 2 is put in the atmosphereHeating with box-type heating furnace at 90 deg.C below phase transition point, i.e. TβKeeping the temperature for 6h after reaching the temperature of minus 90 ℃;
step 4, blank forging
Forging the bar stock heated in the step 3 by using a precision forging machine, wherein the forging pass is 5 passes, the forged specification phi is 160mm, the pass deformation is 100mm, 30mm, 20mm and 20mm in sequence, the precision forging accumulated deformation is 79.1 percent, and blanking is performed after forging;
Heating the bar blank processed in the step 4 by adopting a box type heating furnace in the atmosphere, wherein the temperature is 90 ℃ below the phase transition point, namely TβKeeping the temperature for 5 hours after the temperature reaches 90 ℃ below zero;
step 6, rolling finished products
Rolling the bar stock heated in the step 5 by using a rolling mill, wherein the size of the rolled bar stock is phi 75mm, the rolling pass is 10, and the accumulated rolling deformation is 78.0%;
step 7, heat treatment of finished product
And (4) carrying out heat treatment on the finished bar blank rolled in the step (6) by using a heat treatment furnace, wherein the heat preservation temperature is 750 ℃, the heat treatment is carried out in the atmosphere, and the heat preservation time is 1.5 h.
Example 4
Step 1, ingot casting heating:
selecting cast ingots with the specification of phi 950mmTi6Al4VELI, heating the cast ingots to the temperature of more than 100 ℃ of the phase transformation point, namely T, by adopting a box type heating furnace in atmospheric atmosphereβ+100 ℃, and keeping the temperature for 4 hours after reaching the temperature;
step 2, ingot cogging and forging
Forging the titanium alloy ingot heated in the step 1 by using a precision forging machine, wherein the forging pass is 3 passes, the specification phi of the forged ingot is 350mm, the pass deformation is 200mm, 200mm and 200mm in sequence, and the precision forging accumulated deformation is 86.4 percent;
step 3, heating the blank
Heating the bar blank processed in the step 2 by adopting a box type heating furnace in the atmosphere, wherein the temperature is 150 ℃ below the phase transition point, namely TβKeeping the temperature for 10 hours after reaching the temperature of 150 ℃ below zero;
step 4, blank forging
Forging the bar stock heated in the step 3 by using a precision forging machine, wherein the forging pass is 3 passes, the forged specification phi is 160mm, the pass deformation is 70 mm, 60mm and 60mm in sequence, the precision forging accumulated deformation is 79.1 percent, and blanking is performed after forging;
Heating the bar blank processed in the step 4 by adopting a box type heating furnace in the atmosphere, wherein the temperature is 30 ℃ below the phase transition point, namely TβKeeping the temperature for 2h after reaching the temperature of minus 30 ℃;
step 6, rolling finished products
Rolling the bar stock heated in the step 5 by using a rolling mill, wherein the size of the rolled bar stock is phi 100mm, and the accumulated rolling deformation is 60.9% in 6 passes;
step 7, heat treatment of finished product
And (4) carrying out heat treatment on the finished bar blank rolled in the step (6) by using a heat treatment furnace, wherein the heat preservation temperature is 700 ℃, the heat treatment is carried out in the atmosphere, and the heat preservation time is 2 hours.
Example 5
Step 1, ingot casting heating:
selecting cast ingot with specification of phi 500mmTC4-DT, heating to 250 ℃ above the transformation point, namely T, in atmospheric atmosphere by adopting a box type heating furnaceβ+250 ℃, and keeping the temperature for 12 hours after reaching the temperature;
step 2, ingot cogging and forging
Forging the titanium alloy ingot heated in the step 1 by using a precision forging machine, wherein the forging pass is 5 passes, the specification phi of the forged ingot is 350mm, the pass deformation is 30mm, 30mm and 30mm in sequence, the precision forging accumulated deformation is 51.0 percent, and blanking is performed after forging;
step 3, heating the blank
Heating the bar blank processed in the step 2 by adopting a box type heating furnace in the atmosphere, wherein the temperature is 30 ℃ below the phase transition point, namely TβKeeping the temperature for 3 hours after reaching the temperature of minus 30 ℃;
step 4, blank forging
Forging the bar stock heated in the step 3 by using a precision forging machine, wherein the forging pass is 5 passes, the forged specification phi is 160mm, the pass deformation is 80 mm, 40 mm, 30mm, 20mm and 20mm in sequence, the precision forging accumulated deformation is 79.1 percent, and blanking is performed after forging;
Heating the bar blank processed in the step 4 by adopting a box type heating furnace in the atmosphere, wherein the temperature is 150 ℃ below the phase transition point, namely TβKeeping the temperature for 8h after the temperature reaches 150 ℃ below zero;
step 6, rolling finished products
Rolling the bar stock heated in the step 5 by using a rolling mill, wherein the size of the rolled bar stock is phi 50mm, the rolling pass is 16, and the accumulated rolling deformation is 90.2%;
step 7, heat treatment of finished product
And (4) carrying out heat treatment on the finished bar blank rolled in the step (6) by using a heat treatment furnace, wherein the heat preservation temperature is 800 ℃, the heat treatment is carried out in the atmosphere, and the heat preservation time is 1 h.
Analysis of results
Fig. 1 and fig. 2 are sequentially a macroscopic view and a macroscopic view of a transverse structure of a Φ 100mm tc4ELI bar prepared in example 1 of the present invention, and it can be seen from the drawings that the transverse macroscopic structure of the bar is uniform, has no clear crystal, is an equiaxial and/or elongated primary α on a transition β matrix at a high magnification, and has no continuous α network on an original β crystal boundary, thereby satisfying the requirements of corresponding standards. Fig. 3 and 4 are sequentially a macroscopic view and a macroscopic view of a transverse structure of a phi 50mmTC4 bar prepared in example 2 of the present invention, and it can be seen from the macroscopic view that the transverse macroscopic view of the bar is uniform, has no clear crystal, is an equiaxial and/or elongated primary α on a transformed β matrix at a high magnification, and has no continuous α network on an original β crystal boundary, thereby satisfying the requirements of corresponding standards. Fig. 5 shows the annealed room temperature mechanical properties of TC 4-based bars respectively prepared in example 1, example 2 and example 3 of the present invention, and it can be seen that the mechanical properties are consistent and stable, and meet the requirements of the corresponding standards.
Claims (10)
1. A preparation method of a TC4 titanium alloy finished bar with short process and low cost is characterized in that a TC4 titanium alloy ingot is heated above a phase transformation point and is kept warm, then the ingot is subjected to one-fire-time multi-pass fine forging and cogging, blanking, then the ingot is heated below the phase transformation point, subjected to one-fire-time multi-pass processing and fine forging to form an intermediate blank, and then the intermediate blank is heated below the phase transformation point, subjected to one-fire-time multi-pass rolling and is rolled to a finished product.
2. The method for preparing the short-flow low-cost TC4 titanium alloy finished bar according to claim 1, which comprises the following steps:
step 1, ingot heating
Selecting a TC4 titanium alloy ingot, heating to a temperature above a phase transition point by using a box-type heating furnace in an atmospheric atmosphere, and preserving heat;
step 2, ingot cogging and forging
Forging the TC4 titanium alloy ingot heated in the step 1 by using a precision forging machine, and air-cooling and blanking after forging to obtain a first bar blank;
step 3, heating the first bar blank
Heating the first bar blank obtained in the step (2) to a temperature below the phase change point by using a box type heating furnace in an atmospheric atmosphere and preserving heat;
step 4, forging the first bar blank
Forging the first bar blank heated in the step 3 by using a precision forging machine, and air-cooling and blanking after forging to obtain a second bar blank;
step 5, heating the second bar blank
Heating the second bar blank obtained in the step (4) to a temperature below the phase change point by using a box type heating furnace in an atmospheric atmosphere and preserving heat;
step 6, rolling the second bar blank
Rolling the second bar stock heated in the step 5 by using a rolling mill, and then air-cooling to obtain a finished bar stock;
step 7, heat treatment of finished bar blank
And (4) carrying out heat treatment on the finished bar blank obtained in the step (6) in an atmosphere by using a heat treatment furnace to obtain the TC4 titanium alloy finished bar.
3. The method for preparing the finished bar of the TC4 titanium alloy with short process and low cost as claimed in claim 2, wherein the TC4 titanium alloy ingot in the step 1 comprises one of the titanium alloy ingots with the brand numbers of TC4, TC4ELI, TC4-DT, Ti6Al4V or Ti6Al4 VELI; the specification of the TC4 titanium alloy ingot in the step 1 is phi 500-phi 950 mm.
4. The method for preparing the TC4 titanium alloy finished bar in the short-flow and low-cost manner as claimed in claim 2, wherein the heating temperature of the titanium alloy ingot in the step 1 is Tβ+100～Tβ+250 ℃ wherein, TβIs TC4 titanium alloy phase-change point temperature; the heat preservation time is 4-12 h.
5. The method for preparing the short-flow low-cost TC4 titanium alloy finished bar according to claim 2, wherein the forging pass in the step 2 is 3-7 passes, the first bar blank obtained by forging has a specification of phi 350mm, the pass deformation is 30-200 mm, and the accumulated deformation of the finish forging is 51.0-86.4%.
6. The method for preparing the short-flow low-cost TC4 titanium alloy finished bar as claimed in claim 2, wherein the heating temperature of the first bar blank in the step 3 is Tβ-150～Tβ-30 ℃ of which T isβIs TC4 titanium alloy phase-change point temperature; the heat preservation time is 3-10 h.
7. The method for preparing the short-process low-cost TC4 titanium alloy finished bar according to claim 2, wherein the forging pass in the step 4 is 3-5 passes, the second bar blank obtained by forging has a specification of phi 160mm, the pass deformation is 20-100 mm, and the accumulated finish forging deformation is 79.1%.
8. The method for preparing the short-flow low-cost TC4 titanium alloy finished bar as claimed in claim 2, wherein the heating temperature of the second bar blank in the step 5 is Tβ-150～Tβ-30 ℃ of which T isβIs TC4 titanium alloy phase-change point temperature; the heat preservation time is 2-8 h.
9. The method for preparing the short-process low-cost TC4 titanium alloy finished bar as claimed in claim 2, wherein the rolling mill is used for 6 to 16 rolling passes in the step 6, the size of the rolled finished bar is phi 50 to phi 100mm, and the rolling accumulated deformation is 60.9 to 90.2 percent.
10. The method for preparing the short-process low-cost TC4 titanium alloy finished bar according to claim 2, wherein the heat treatment temperature of the finished bar blank in the step 7 is 700-800 ℃, and the heat preservation time is 1-2 h.
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| CN114752877A (en) * | 2022-05-30 | 2022-07-15 | 西部超导材料科技股份有限公司 | Preparation method of Ti6Al4V alloy bar with high sound velocity uniformity |
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