CN116441565A - Heat treatment method for improving tensile property of TC4 titanium alloy - Google Patents
Heat treatment method for improving tensile property of TC4 titanium alloy Download PDFInfo
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- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 85
- 238000010438 heat treatment Methods 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 46
- 230000032683 aging Effects 0.000 claims abstract description 36
- 238000004321 preservation Methods 0.000 claims abstract description 35
- 238000001816 cooling Methods 0.000 claims abstract description 33
- 239000006104 solid solution Substances 0.000 claims abstract description 32
- 239000000654 additive Substances 0.000 claims abstract description 20
- 230000000996 additive effect Effects 0.000 claims abstract description 20
- 238000010791 quenching Methods 0.000 claims abstract description 15
- 230000000171 quenching effect Effects 0.000 claims abstract description 15
- 239000002131 composite material Substances 0.000 claims abstract description 14
- 230000007704 transition Effects 0.000 claims abstract description 9
- 230000008021 deposition Effects 0.000 claims abstract description 7
- 238000005096 rolling process Methods 0.000 claims abstract description 5
- 230000001360 synchronised effect Effects 0.000 claims abstract description 3
- 238000004519 manufacturing process Methods 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 4
- 238000000137 annealing Methods 0.000 abstract description 5
- 239000012071 phase Substances 0.000 description 24
- 244000137852 Petrea volubilis Species 0.000 description 23
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 23
- 229910010271 silicon carbide Inorganic materials 0.000 description 23
- 230000000052 comparative effect Effects 0.000 description 16
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 15
- 238000007789 sealing Methods 0.000 description 15
- 239000000203 mixture Substances 0.000 description 14
- 239000000243 solution Substances 0.000 description 9
- 239000000463 material Substances 0.000 description 7
- 230000009466 transformation Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 235000013339 cereals Nutrition 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000006911 nucleation Effects 0.000 description 2
- 238000010899 nucleation Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000011895 specific detection Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/60—Treatment of workpieces or articles after build-up
- B22F10/64—Treatment of workpieces or articles after build-up by thermal means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
- B33Y40/20—Post-treatment, e.g. curing, coating or polishing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention provides a heat treatment method for improving the tensile property of TC4 titanium alloy, which comprises the following steps: placing the treated TC4 titanium alloy sample into a heat treatment furnace, heating to a temperature below the beta phase transition temperature, and carrying out solid solution heat preservation; then cooling to a certain temperature according to a set cooling speed, and immediately performing water-cooling quenching; heating the quenched sample in a heat treatment furnace again to below the beta phase transition temperature, preserving heat for a period of time, and cooling; the TC4 titanium alloy sample is manufactured by plasma arc deposition composite synchronous rolling additive. In summary, the invention combines the characteristics of subcritical annealing regulation and control primary phase, large-scale microstructure, solid solution aging regulation and control secondary phase and small-scale microstructure, and after heat treatment, microstructure comprising equiaxial primary alpha, discontinuous grain boundary alpha, secondary phase and alpha/beta interface phase is obtained, and the tensile property of TC4 titanium alloy is obviously improved.
Description
Technical Field
The invention relates to the technical field of manufacturing TC4 titanium alloy by plasma arc additive, in particular to a heat treatment method for improving the tensile property of TC4 titanium alloy.
Background
Titanium alloys, particularly TC4, have excellent mechanical properties, such as higher specific strength than general steel and aluminum alloys, and therefore are widely used in aerospace fields where metal weight loss is of particular concern. Also, because of physical characteristics of titanium such as low thermal conductivity and high chemical activity, the tool cannot cut the titanium alloy rapidly, so that adhesion of the tool caused by heat accumulation is avoided, and the precision of parts is reduced. Therefore, the traditional forming method (plastic forming, mechanical processing and the like) has the characteristics of longer forming period, lower material utilization rate and higher production cost. The conventional method for forming titanium alloy is based on the idea of equal material or reduced material forming, so to avoid the drawbacks of the conventional method, additive manufacturing (Additive Manufacturing, AM) methods based on the idea of additive forming and rapid near net shape forming can be adopted. Arc additive manufacturing (Wire andArcAdditive Manufacturing, WAAM) is a technique in which wire material is melted by an arc heat source and deposited layer by layer in a given path to produce a solid part. However, the TC4 titanium alloy presents coarse columnar beta crystals and uneven microstructure characteristics due to repeated rapid thermal cycles including melting, solidification and alpha/beta solid phase transformation in the arc additive manufacturing process, and the defects of anisotropy of tensile property and lower elongation rate are caused. The common regulation and control methods are to optimize deposition parameters, design alloy components, compound other processes and perform post-deposition heat treatment.
The composite other process control methods generally combine the deposition and plastic deformation processes, and have better effects on the equiaxed and grain refining effects of primary columnar beta grains than the optimization of deposition parameters and the design of alloy component methods. Wherein rolling is capable of producing a greater plastic deformation than ultrasonic impact. Although the homogenization of primary beta crystals is realized by the deposition and rolling of the composite plasma arc, a large regulating space exists for more than 80% of primary alpha dependence in room temperature tissues. On the other hand, in order to achieve the further improvement of the performance, it is also necessary to study a microstructure of a small scale: a secondary phase and an alpha/beta interfacial phase, which have an important influence on the improvement of tensile properties. Thus, the characteristics of the alpha phase determine the room temperature tensile properties of the TC4 titanium alloy. The patent with publication number CN108374136B discloses a heat treatment method for improving the strength and plasticity of TC4 titanium alloy, which adopts the method of solution treatment, deformation and aging treatment, and the method is based on the principle that nucleation power of secondary alpha is accumulated for the aging process through the cold deformation process, so that the finally obtained tissue is tiny and evenly distributed.
Heat treatment is an important way to regulate the structural properties of TC4 titanium alloy, enabling control of elemental diffusion processes and cooling rates. According to previous studies, the TC4 titanium alloy heat treatment has been provided with a standard heat treatment regime, and a common heat treatment regime is established on top of the TC4 titanium alloy wrought structure (binary or equiaxed structure). Because of the close relationship between the tissue properties and the initial structure after TC4 heat treatment, TC4 titanium alloys have unique tissue characteristics that are different from the as-forged or Wittig structures after composite additive manufacturing. Therefore, a heat treatment method suitable for manufacturing a unique microstructure of the TC4 titanium alloy by using the plasma arc composite additive is required to be designed, but the heat treatment method in the patent only aims at the secondary alpha and cannot be adjusted and controlled according to the alpha phase characteristics.
Disclosure of Invention
In view of this, the invention provides a heat treatment method for improving the tensile property of the TC4 titanium alloy, which adopts a method of combining subcritical annealing treatment and solution aging treatment, can regulate and control microstructure of the TC4 titanium alloy manufactured by plasma arc composite additive material, and improves the tensile property of the TC4 titanium alloy manufactured by plasma arc composite additive material.
The technical scheme of the invention is realized as follows:
the invention provides a heat treatment method for improving the tensile property of TC4 titanium alloy, which comprises the following steps:
s1, placing the treated TC4 titanium alloy sample into a heat treatment furnace, heating to a temperature below the beta phase transition temperature, and carrying out solid solution heat preservation;
s2, cooling the TC4 titanium alloy sample subjected to solid solution heat preservation to a certain temperature according to a set cooling speed, and immediately performing water cooling quenching;
s3, placing the TC4 titanium alloy sample after quenching treatment in a heat treatment furnace again, heating to the temperature below the beta phase transition temperature, aging, preserving heat, and finally cooling. In the present invention, the cooling temperature is 20-25 ℃.
Based on the above technical solution, preferably, in step 1, the method for processing the TC4 titanium alloy sample includes: the size is 12X 8X 5mm 3 The oxide layer of TC4 titanium alloy of (2) is removed by using 200# silicon carbide sand paper, and the silicon carbide sand paper is put into a quartz glass tube for sealing treatment. The TC4 titanium alloy sample is formed by the plasma arc deposition, the composite synchronous rolling and the additive manufacturing (hereinafter referred to as the plasma arc composite additive manufacturing TC4 titanium alloy).
It is further preferable that the solid solution temperature is 10 to 20 ℃ below the beta phase transition temperature, and not too low, which results in less transformation of the alpha phase into the beta phase upon solid solution. In the invention, the temperature of solid solution heat preservation is 940-950 ℃, and the time of solid solution heat preservation is 1.5-3h.
Based on the technical scheme, in the step 2, the cooling speed is preferably lower than the common furnace cooling speed, and is set to be 0.5-1 ℃/min, and the quenching temperature is preferably 900 ℃. Further preferably, the cooling rate is set to 0.8-0.9 ℃/min.
Based on the above technical scheme, preferably, in step 3, the temperature during aging heat preservation is below the beta phase transition temperature, changes around the alpha phase transition temperature, and is 550-860 ℃, and the time of aging heat preservation is 1.5-3h. Further preferably, the temperature at which the aging is maintained is 600 to 720 ℃.
The principle of the invention is as follows:
the method aims at manufacturing TC4 titanium alloy by plasma arc composite additive, and combines two heat treatment systems for the excellent microstructure obtained after subcritical annealing and solid solution aging; in order to obtain discontinuous grain boundaries alpha to improve plasticity, solid solution is carried out at subcritical high temperature to consume a large amount of primary grain boundaries alpha, secondary grain boundary alpha particles are formed among primary grain boundary alpha particles during cooling, and the whole grain boundary alpha shape is discontinuous;
in order to obtain equiaxed primary alpha, furnace cooling is carried out during cooling, so that the secondary alpha phase can be ensured to be separated out and slowly grow on the remaining lamellar alpha phase, and the equiaxed alpha is promoted to be formed;
in order to obtain a large amount of dispersed secondary alpha and alpha/beta interface phases, the ageing temperature is raised as much as possible in the ageing stage to promote the complete decomposition of martensite alpha and the formation of alpha/beta interface phases, but the ageing temperature cannot exceed 860 ℃, above which the alpha and beta contents change drastically.
Compared with the prior art, the heat treatment method has the following beneficial effects:
1. since the initial microstructure to be heat treated has a great influence on the structural properties after heat treatment, the same heat treatment method is applied to TC4 titanium alloys with different microstructure characteristics, and the finally generated structural properties are different, so that the method is used for heat treatment of TC4 titanium alloys for manufacturing plasma arc composite additive materials, and the formed microstructure has the characteristics of cast or forged microstructure.
2. Aiming at the characteristics and properties of TC4 titanium alloy manufactured by plasma arc composite additive, a subcritical annealing treatment and solid solution aging treatment compounding method is adopted, and the principle of the method is that the characteristics of a primary phase and a large-scale microstructure regulated by subcritical annealing, a secondary phase regulated by solid solution aging and a small-scale microstructure are combined to obtain the microstructure with equiaxial primary alpha, discontinuous grain boundary alpha, secondary phase and alpha/beta interface phase; therefore, the method can regulate and control all alpha phase characteristics, realize the transformation from lamellar primary alpha phase to equiaxial primary alpha phase and the transformation from discontinuous grain boundary alpha to continuous grain boundary alpha, and obtain a dispersed secondary phase and a small-scale alpha/beta interface phase. The method does not need additional deformation treatment, and can utilize heat treatment accumulation to generate nucleation power of a required tissue, so that the process operation is more coherent and is convenient to control.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a microstructure photograph of TC4 titanium alloy in example 1 of the present invention;
FIG. 2 is a graph showing tensile properties of TC4 titanium alloy in example 1 of the present invention;
FIG. 3 is a microstructure photograph of TC4 titanium alloy in example 2 of the present invention;
FIG. 4 is a graph showing tensile properties of TC4 titanium alloy in example 2 of the present invention;
FIG. 5 is a microstructure photograph of TC4 titanium alloy in example 3 of the present invention;
FIG. 6 is a graph showing tensile properties of TC4 titanium alloy in example 3 of the present invention;
FIG. 7 is a microstructure photograph of TC4 titanium alloy in example 4 of the present invention;
FIG. 8 is a graph showing tensile properties of TC4 titanium alloy in example 4 of the present invention.
Detailed Description
The following description of the embodiments of the present invention will clearly and fully describe the technical aspects of the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present invention.
Example 1
(1) The size is 12X 8X 5mm 3 TC4 titanium alloy of (C) by mesh numberAnd removing an oxide layer of 200# silicon carbide sand paper, and putting the silicon carbide sand paper into a quartz glass tube for sealing treatment. And (3) placing the treated sample in a heat treatment furnace, heating to 940 ℃, and carrying out solid solution heat preservation for 2 hours.
(2) After the heat preservation time is reached, the set cooling speed is 0.8 ℃/min, the quenching temperature is 900 ℃, and the water cooling quenching is immediately carried out after the temperature is reached;
(3) And removing an oxide layer of the quenched sample by using 200# silicon carbide sand paper, and placing the sample into a quartz glass tube for sealing treatment. Then the mixture is put into a heat treatment furnace again to be heated to 600 ℃, the aging heat preservation time is 1.7h, and then the mixture is taken out and put into the air to be cooled.
The TC4 titanium alloy of this example had a yield strength of 970MPa, a tensile strength of 1062MPa, and an elongation of 12.4%.
Example 2
(1) The size is 12X 8X 5mm 3 The oxide layer of TC4 titanium alloy of (2) is removed by using 200# silicon carbide sand paper, and the silicon carbide sand paper is put into a quartz glass tube for sealing treatment. And (3) placing the treated sample in a heat treatment furnace, heating to 950 ℃, and carrying out solid solution heat preservation for 2.5 hours.
(2) After the heat preservation time is reached, the set cooling speed is 0.9 ℃/min, the quenching temperature is 900 ℃, and the water cooling quenching is immediately carried out after the temperature is reached;
(3) And removing an oxide layer of the quenched sample by using 200# silicon carbide sand paper, and placing the sample into a quartz glass tube for sealing treatment. Then the mixture is put into a heat treatment furnace again to be heated to 720 ℃, the aging heat preservation time is 2 hours, and then the mixture is taken out and put into the air to be cooled.
The TC4 titanium alloy of this example had a yield strength of 926MPa, a tensile strength of 1023MPa, and an elongation of 12.1%.
Example 3
(1) The size is 12X 8X 5mm 3 The oxide layer of TC4 titanium alloy of (2) is removed by using 200# silicon carbide sand paper, and the silicon carbide sand paper is put into a quartz glass tube for sealing treatment. And (3) placing the treated sample in a heat treatment furnace, heating to 950 ℃, and carrying out solid solution heat preservation for 1.5 hours.
(2) After the heat preservation time is reached, the set cooling speed is 0.5 ℃/min, the quenching temperature is 900 ℃, and the water cooling quenching is immediately carried out after the temperature is reached;
(3) And removing an oxide layer of the quenched sample by using 200# silicon carbide sand paper, and placing the sample into a quartz glass tube for sealing treatment. Then the mixture is put into a heat treatment furnace again to be heated to 550 ℃, the aging heat preservation time is 1.5h, and then the mixture is taken out and put into the air to be cooled.
The TC4 titanium alloy of this example had a yield strength of 902MPa, a tensile strength of 1005MPa, and an elongation of 14.1%.
Example 4
(1) The size is 12X 8X 5mm 3 The oxide layer of TC4 titanium alloy of (2) is removed by using 200# silicon carbide sand paper, and the silicon carbide sand paper is put into a quartz glass tube for sealing treatment. And (3) placing the treated sample in a heat treatment furnace, heating to 940 ℃, and carrying out solid solution heat preservation for 3 hours.
(2) After the heat preservation time is reached, the set cooling speed is 1 ℃/min, the quenching temperature is 900 ℃, and water cooling quenching is immediately carried out after the temperature is reached;
(3) And removing an oxide layer of the quenched sample by using 200# silicon carbide sand paper, and placing the sample into a quartz glass tube for sealing treatment. Then the mixture is put into a heat treatment furnace again to be heated to 860 ℃, the aging heat preservation time is 3 hours, and then the mixture is taken out and put into the air to be cooled.
The TC4 titanium alloy of this example had a yield strength of 909MPa, a tensile strength of 1002MPa, and an elongation of 15.7%.
As can be seen from the four examples, the TC4 titanium alloy prepared by the method has yield strength of 902MPa or more, tensile strength of 1002MPa or more and elongation of 12.1% or more. Therefore, the TC4 titanium alloy obtained by the heat treatment method has better yield strength and tensile strength, and can obtain excellent strength and elongation matching performance.
Comparative example 1
Ion arc composite additive without any heat treatment produces TC4 titanium alloy.
Comparative example 2 sample difference
The sample was changed to cast TC4 titanium alloy based on example 1, and the other steps were the same.
Comparative example 3 exchange of step two for the treatment mode in the prior art
Step two is replaced on the basis of the embodiment 1; the specific steps after replacement are as follows:
(1) The size is 12X 8X 5mm 3 The oxide layer of TC4 titanium alloy of (2) is removed by using 200# silicon carbide sand paper, and the silicon carbide sand paper is put into a quartz glass tube for sealing treatment. And (3) placing the treated sample in a heat treatment furnace, heating to 940 ℃, and carrying out solid solution heat preservation for 2 hours.
(2) Cooling the sample subjected to solid solution heat preservation to room temperature, and carrying out 5% cold plastic deformation on the cooled TC4 titanium alloy;
(3) And removing an oxide layer of the quenched sample by using 200# silicon carbide sand paper, and placing the sample into a quartz glass tube for sealing treatment. Then the mixture is put into a heat treatment furnace again to be heated to 600 ℃, the aging heat preservation time is 1.7h, and then the mixture is taken out and put into the air to be cooled.
Comparative example 4 solid solution temperature adjustment
On the basis of example 2, the solid solution temperature was adjusted to: 980 ℃.
Comparative example 5 solid solution temperature adjustment
On the basis of example 2, the solid solution temperature was adjusted to: 920 ℃.
Comparative example 6 different ageing temperatures
On the basis of example 1, the aging temperature was adjusted to: 450 ℃.
Comparative example 7 different ageing temperatures
On the basis of example 1, the aging temperature was adjusted to: 880 ℃.
Comparative example 8 samples were different and the solution temperature was adjusted
Based on example 1, the sample was changed to as cast TC4 titanium alloy while the solution temperature was adjusted to: 920 ℃; the other steps are the same.
Comparative example 9 samples were different and the ageing temperature was adjusted
Based on example 1, the samples were changed to as cast TC4 titanium alloy while the aging temperature was adjusted to: 880 ℃; the other steps are the same.
Comparative example 10 samples were different and the solution temperature and aging temperature were adjusted
Based on example 1, the sample was changed to as cast TC4 titanium alloy while the solution temperature was adjusted to: the aging temperature is adjusted to be: 880 ℃; the other steps are the same.
Comparative example 11 solid solution temperature and aging temperature adjustment
On the basis of example 2, the solid solution temperature was adjusted to: 980 ℃, the aging temperature is adjusted to be: 880 ℃. Comparative example 12 step two was replaced with a treatment in the prior art and the solution temperature was adjusted
Step two is replaced on the basis of the embodiment 1; the specific steps after replacement are as follows:
(1) The size is 12X 8X 5mm 3 The oxide layer of TC4 titanium alloy of (2) is removed by using 200# silicon carbide sand paper, and the silicon carbide sand paper is put into a quartz glass tube for sealing treatment. And (3) placing the treated sample in a heat treatment furnace, heating to 980 ℃, and carrying out solid solution heat preservation for 2 hours.
(2) Cooling the sample subjected to solid solution heat preservation to room temperature, and carrying out 5% cold plastic deformation on the cooled TC4 titanium alloy;
(3) And removing an oxide layer of the quenched sample by using 200# silicon carbide sand paper, and placing the sample into a quartz glass tube for sealing treatment. Then the mixture is put into a heat treatment furnace again to be heated to 600 ℃, the aging heat preservation time is 1.7h, and then the mixture is taken out and put into the air to be cooled.
Comparative example 13 step two was replaced with a treatment in the prior art and the ageing temperature was adjusted
Step two is replaced on the basis of the embodiment 1; the specific steps after replacement are as follows:
(1) The size is 12X 8X 5mm 3 The oxide layer of TC4 titanium alloy of (2) is removed by using 200# silicon carbide sand paper, and the silicon carbide sand paper is put into a quartz glass tube for sealing treatment. And (3) placing the treated sample in a heat treatment furnace, heating to 940 ℃, and carrying out solid solution heat preservation for 2 hours.
(2) Cooling the sample subjected to solid solution heat preservation to room temperature, and carrying out 5% cold plastic deformation on the cooled TC4 titanium alloy;
(3) And removing an oxide layer of the quenched sample by using 200# silicon carbide sand paper, and placing the sample into a quartz glass tube for sealing treatment. Then the mixture is put into a heat treatment furnace again to be heated to 450 ℃, the aging heat preservation time is 1.7h, and then the mixture is taken out and put into the air to be cooled.
The TC4 titanium alloy prepared in the comparative example is subjected to performance detection, and specific detection results are shown in Table 1.
Table 1 results of performance tests of TC4 titanium alloys prepared in examples and comparative examples
As can be seen from the performance detection results of the TC4 titanium alloy prepared by the comparative example, the tensile property of the TC4 titanium alloy prepared by the heat treatment method is obviously improved, and therefore, the TC4 titanium alloy has excellent tensile property.
In addition, the microstructure suitable for the heat treatment method provided by the invention is wide in variety, is especially suitable for the microstructure of the TC4 titanium alloy manufactured by arc additive, and has applicability to the microstructure of the TC4 titanium alloy manufactured by laser and electron beam additive.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (10)
1. A heat treatment method for improving the tensile properties of TC4 titanium alloy, comprising the steps of:
s1, placing the treated TC4 titanium alloy into a heat treatment furnace, heating to a temperature below the beta phase transition temperature, and carrying out solid solution heat preservation;
s2, cooling the TC4 titanium alloy subjected to solid solution heat preservation to a certain temperature according to a set cooling speed, and immediately performing water cooling quenching;
s3, placing the TC4 titanium alloy subjected to quenching treatment in a heat treatment furnace again, heating to a temperature below the beta-phase transition temperature, aging, preserving heat, and finally cooling;
the TC4 titanium alloy is formed for additive manufacturing of plasma arc deposition composite synchronous rolling.
2. The heat treatment method for improving the tensile properties of TC4 titanium alloy according to claim 1, wherein: the TC4 titanium alloy treatment method comprises the following steps: the size is 12X 8X 5mm 3 The oxide layer was removed with 200# grit sandpaper and then sealed.
3. The heat treatment method for improving the tensile properties of TC4 titanium alloy according to claim 1, wherein: in the step S1, the temperature in the solid solution heat preservation process is 940-950 ℃.
4. The heat treatment method for improving the tensile properties of a TC4 titanium alloy according to claim 3, wherein: in the step S1, the solid solution heat preservation time is 1.5-3h.
5. The heat treatment method for improving the tensile properties of TC4 titanium alloy according to claim 1, wherein: in the step S2, the cooling speed is 0.5-1 ℃/min.
6. The heat treatment method for improving the tensile properties of a TC4 titanium alloy according to claim 5, wherein: in the step S2, the cooling speed is 0.8-0.9 ℃/min.
7. The heat treatment method for improving the tensile properties of TC4 titanium alloy according to claim 1, wherein: in the step S2, the quenching temperature is 900 ℃.
8. The heat treatment method for improving the tensile properties of TC4 titanium alloy according to claim 1, wherein: in the step S3, the temperature during aging heat preservation is 550-860 ℃.
9. The heat treatment method for improving the tensile properties of TC4 titanium alloy according to claim 8, wherein: in the step S3, the temperature of the aging heat preservation is 600-720 ℃.
10. The heat treatment method for improving the tensile properties of TC4 titanium alloy according to claim 1, wherein: in the step S3, the time of aging heat preservation is 1.5-3h.
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2023
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