CN111690889A - Method for regulating TC4 titanium alloy phase ratio through heat treatment - Google Patents

Method for regulating TC4 titanium alloy phase ratio through heat treatment Download PDF

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Publication number
CN111690889A
CN111690889A CN202010649453.2A CN202010649453A CN111690889A CN 111690889 A CN111690889 A CN 111690889A CN 202010649453 A CN202010649453 A CN 202010649453A CN 111690889 A CN111690889 A CN 111690889A
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titanium alloy
heat treatment
phase
alpha
regulating
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周舸
刘超
王鑫
门月
张浩宇
陈立佳
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Shenyang University of Technology
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Shenyang University of Technology
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
    • C22F1/18—High-melting or refractory metals or alloys based thereon
    • C22F1/183—High-melting or refractory metals or alloys based thereon of titanium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum

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  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Engineering & Computer Science (AREA)
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  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
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Abstract

The invention discloses a method for regulating and controlling TC4 titanium alloy phase ratio through heat treatment, which is characterized in that the ratio range of alpha phase and beta phase can be accurately and effectively regulated and controlled, and the method specifically comprises the following steps: firstly, sanding TC4 titanium alloy with sand paper to remove an oxide layer on the surface of the titanium alloy, and preventing the oxide layer on the surface from interfering the heat treatment effect in the subsequent heat treatment process; secondly, carrying out heat treatment on the TC4 titanium alloy polished by the sand paper, and selecting a corresponding heat treatment mode according to the obtained alpha phase proportion interval value; and finally, sequentially grinding, mechanically polishing, performing metallographic corrosion on the surface of the TC4 sample subjected to heat treatment, observing the metallographic structure of the corroded surface, and performing statistical analysis on the coloring alpha phase in the metallographic diagram to obtain the alpha phase ratio.

Description

Method for regulating TC4 titanium alloy phase ratio through heat treatment
Technical Field
The invention belongs to the technical field of titanium alloy material processing, and particularly relates to a method for regulating and controlling TC4 titanium alloy phase proportion through heat treatment.
Background
The TC4(Ti-6Al-4V) titanium alloy belongs to (alpha + beta) type dual-phase alloy, and has the advantages of good high-temperature performance, stable structure, good welding performance, good corrosion resistance of the alpha type titanium alloy and good thermal stability of the beta type titanium alloy, and the TC4 titanium alloy also has good properties of structure stability, toughness, plasticity and the like, so that the titanium alloy can be subjected to hot working well, but the titanium alloy has more types of microstructures due to the complexity of phase change of the titanium alloy and the diversity of the hot working process. However, for the most widely used two-phase titanium alloys, the four major categories of widmannstatten, basket, duplex and equiaxed structures can be generalized.
The final properties of the titanium alloy are mainly determined by the structure composition, the structure of the titanium alloy is changed when the titanium alloy is subjected to superplastic deformation, crystal grains grow continuously along with the increase of the deformation degree in the plastic deformation process of the titanium alloy, the titanium alloy is equiaxial under a small deformation amount, the crystal grains slide along the grain boundary in the process, the crystal grains rotate, and the phenomena of intra-crystal slip, dynamic recrystallization, dislocation density change and the like exist along with the growth of the crystal grains.
At present, the method for improving the superplasticity of the TC4 titanium alloy at home and abroad is mainly to refine the TC4 titanium alloy grains, so that the deformation potential of the material is greatly improved, and on the other hand, the changes are closely related to alpha and beta phases in the TC4 titanium alloy. Therefore, different grain sizes and comparative examples have great influence on the superplasticity of the titanium alloy, but the research on the TC4 titanium alloy at present mostly focuses on improving the plasticity of the titanium alloy by means of grain refinement, and does not fully exert the coordination effect of the alpha phase and the beta phase in the TC4 superplastic deformation period, so that the TC4 dual-phase titanium alloy fully exerts the effect of the alpha-beta phase ratio in the superplastic deformation process, can well combine the grain size of the TC4 titanium alloy with the comparative example, and achieves the effect of improving the superplasticity of the TC4 alloy, and therefore the technology for regulating and controlling the phase ratio in the TC4 titanium alloy at present has great practical significance.
Disclosure of Invention
Aiming at the defects of the existing technology for regulating the phase ratio of the TC4 titanium alloy, the invention completely describes and experiments the alpha phase and the beta phase of the TC4 titanium alloy, and provides a reliable method for regulating the phase ratio of the TC4 titanium alloy through heat treatment.
The technical scheme adopted by the invention is as follows:
the method comprises the steps of preliminarily constructing a proportional range interval of alpha and beta phases of the TC4 titanium alloy, drawing initial heat treatment test parameters according to the TC4 titanium alloy phase transition temperature aiming at the different range interval, carrying out metallographic analysis on a sample subjected to heat treatment with the drawn parameters, carrying out statistical analysis on coloring alpha phase in a metallographic diagram through image pro plus software, and finally obtaining heat treatment parameters matched with the expected alpha phase proportional range interval through continuously adjusting the initial test parameters. The calculation method of the β -phase ratio range section is 100% to α -phase ratio range section, and the β -phase ratio range section is obtained.
A method for regulating and controlling TC4 phase ratio through heat treatment specifically comprises the following steps:
step 1: the TC4 titanium alloy is ground by abrasive paper, an oxide layer on the surface of the titanium alloy is removed, and the oxide layer on the surface is prevented from interfering the heat treatment effect in the subsequent heat treatment process;
step 2: and carrying out heat treatment on the ground TC4 titanium alloy by adopting a box-type resistance furnace or a vacuum heat treatment furnace to enable the alpha phase ratio in the TC4 titanium alloy to reach a required interval value.
The method for regulating and controlling the phase ratio of TC4 through heat treatment comprises the following steps:
in the step 2, T is adoptedαNormalizing for 4h at the temperature of 4 ℃ to obtain a phase proportion interval of α in the TC4 alloy, wherein the proportion interval is more than or equal to 80% and less than 90%;
by (T)αNormalizing at +30) deg.C for 4h to obtain α phase proportion range greater than 70% and less than 80%;
by TβNormalizing for 2h at the temperature of 2 ℃ to obtain a phase proportion interval of α in the TC4 alloy, wherein the proportion interval is more than or equal to 50% and less than 60%;
by (T)βNormalizing at +30) deg.C for 2h to obtain TC4 alloy with α phase proportion interval of 40% or more and 50% or less;
by (T)βNormalizing at +70) deg.C for 2h to obtain TC4 alloy with α phase proportion interval of more than 30% and less than 40%;
the T isαRefers to the phase transition temperature of α phase in TC4 titanium alloyβRefers to the phase transition temperature of β phase in the TC4 titanium alloy.
And sequentially grinding, mechanically polishing and metallographic corroding the surface of the TC4 sample subjected to heat treatment, observing the metallographic structure of the corroded surface, and statistically analyzing the coloring alpha phase in the metallographic diagram through image pro plus software to obtain an alpha phase ratio, wherein the error of the alpha phase area ratio is +/-1%.
The invention has the beneficial effects that:
the scheme of the invention greatly improves the control of the alpha and beta phase transformation degree in the heat treatment process of the TC4 titanium alloy, and provides a reliable technical scheme for obtaining different alpha and beta phase proportion of the TC4 titanium alloy.
In addition, the solution and aging method is often adopted for the heat treatment method of TC4 in the prior art, but the controllability of the alpha-phase and beta-phase ratio is not high and the process is complicated. The method of the invention eliminates the aging process, adopts the normalizing heat treatment mode, and has simple steps compared with the traditional solid solution and aging heat treatment mode.
Drawings
FIG. 1 is a metallographic microstructure of a TC4 titanium alloy obtained by heat treatment according to example 1 of the present invention.
FIG. 2 is a metallographic microstructure of TC4 titanium alloy obtained by heat treatment in example 1 of the present invention, showing coloring of alpha phase (white) and statistics of alpha phase ratio.
FIG. 3 is a metallographic microstructure of a TC4 titanium alloy obtained by heat treatment according to example 2 of the present invention.
FIG. 4 is a metallographic microstructure of TC4 titanium alloy obtained by heat treatment in example 2 of the present invention, showing coloring of alpha phase (white) and statistics of alpha phase ratio.
FIG. 5 is a metallographic microstructure of a TC4 titanium alloy obtained by heat treatment according to example 3 of the present invention.
FIG. 6 is a metallographic microstructure of TC4 titanium alloy obtained by heat treatment in example 3 of the present invention, showing coloring of alpha phase (white) and statistics of alpha phase ratio.
FIG. 7 is a metallographic microstructure of a TC4 titanium alloy obtained by heat treatment according to example 4 of the present invention.
FIG. 8 is a metallographic microstructure of TC4 titanium alloy obtained by heat treatment in example 4 of the present invention, showing coloring of alpha phase (white) and statistics of alpha phase ratio.
FIG. 9 is a metallographic microstructure of a TC4 titanium alloy obtained by heat treatment according to example 5 of the present invention.
FIG. 10 is a metallographic microstructure of a TC4 titanium alloy obtained by heat treatment in example 5 of the present invention, showing coloring of alpha phase (white) and a statistical alpha phase ratio.
FIG. 11 is a metallographic microstructure of a TC4 titanium alloy obtained by heat treatment according to example 6 of the present invention.
FIG. 12 is a metallographic microstructure of a TC4 titanium alloy obtained by heat treatment in example 6 of the present invention, showing coloring of alpha phase (white) and a statistical alpha phase ratio.
FIG. 13 is a metallographic microstructure of a TC4 titanium alloy obtained by heat treatment according to example 7 of the present invention.
FIG. 14 is a metallographic microstructure of a TC4 titanium alloy obtained by heat treatment in example 7 of the present invention, showing coloring of alpha phase (white) and a statistical alpha phase ratio.
FIG. 15 is a metallographic microstructure of the original TC4 titanium alloy used in examples 1-7 of the present invention.
Detailed Description
Metallographic microstructure of the original TC4 titanium alloy used in examples 1-5 is shown in FIG. 15, with grain sizes ranging from 0.5 to 6 microns; the heat treatment furnace used in the heat treatment process can be a box-type resistance furnace or a vacuum heat treatment furnace.
Example 1
A method for regulating and controlling the phase ratio of TC4 titanium alloy through heat treatment is operated according to the following steps:
step 1: the TC4 titanium alloy is ground by abrasive paper, an oxide layer on the surface of the titanium alloy is removed, and the oxide layer on the surface is prevented from interfering the heat treatment effect in the subsequent heat treatment process;
step 2, putting the polished TC4 titanium alloy into a box-type resistance furnace with the furnace temperature reaching a set temperature, and adopting a α phase transition temperature TαNext, the normalizing treatment was carried out for 4 hours.
And sequentially grinding, mechanically polishing and metallographic corroding the surface of the TC4 sample subjected to heat treatment, observing the metallographic structure of the corroded surface, and statistically analyzing the coloring alpha phase in a metallographic diagram through image pro plus software to confirm that the alpha phase proportion and the beta phase proportion in the TC4 titanium alloy subjected to heat treatment are 85.8% and 14.2%, respectively. The metallographic microstructure of the TC4 titanium alloy obtained by the heat treatment is shown in fig. 1, and the metallographic microstructure is colored in an alpha phase (white) and the alpha phase accounts for the statistics shown in fig. 2.
Example 2:
the operation procedure of this example is the same as example 1, wherein (T) is adopted for TC4 titanium alloyαThe normalizing treatment mode is carried out for 4 hours at +30) DEG C, the TC4 titanium alloy with α phase proportion of 77.3 percent and β phase proportion of 22.7 percent is obtained, the metallographic microstructure diagram of the TC4 titanium alloy obtained by the heat treatment is shown in figure 3, the metallographic microstructure diagram is α phase (white) coloring and the statistic α phase accounts for example in figure 4.
Example 3:
the operation steps of the embodiment are the same as those of embodiment 1, wherein the phase transition temperature T of β is adopted for the TC4 titanium alloyβThe normalizing treatment mode is carried out for 2h, and the TC4 titanium alloy with α phase proportion of 52.7% and β phase proportion of 47.3% is obtained, the metallographic microstructure diagram of the TC4 titanium alloy obtained by the heat treatment is shown in FIG. 5, and the metallographic microstructure diagram α (white) coloring and the statistical α phase proportion are shown in FIG. 6.
Example 4:
the operation procedure of this example is the same as example 1, wherein (T) is adopted for TC4 titanium alloyβThe normalizing treatment mode is carried out for 2 hours at +30) DEG C, the TC4 titanium alloy with α phase proportion of 45.3 percent and β phase proportion of 54.7 percent is obtained, the metallographic microstructure diagram of the TC4 titanium alloy obtained by the heat treatment is shown in FIG. 7, the metallographic microstructure diagram is α phase (white) coloring and the statistic α phase accounts for example in FIG. 8.
Example 5:
the operation procedure of this example is the same as example 1, wherein (T) is adopted for TC4 titanium alloyβNormalizing at +70) deg.C for 2 hr to obtain TC4 titanium alloy with α phase ratio of 35.7% and β phase ratio of 64.3%, and metallographic microstructure of TC4 titanium alloy obtained by heat treatmentFig. 9 shows the (white) coloration of the α phase microstructure and the statistics of the α phase content in fig. 10.
Example 6:
the operation procedure of this example is the same as example 1, wherein T is adopted for TC4 titanium alloyαThe normalizing treatment mode is carried out for 4h at the temperature of 4 ℃, so that the TC4 titanium alloy with α phase proportion of 81.2 percent and β phase proportion of 18.8 percent is obtained, the metallographic microstructure diagram of the TC4 titanium alloy obtained by the heat treatment is shown in FIG. 11, the metallographic microstructure diagram is α phase (white) coloring, and the α phase accounts for the ratio shown in FIG. 12.
Example 7:
the operation steps of the embodiment are the same as those of embodiment 1, wherein the phase transition temperature T of β is adopted for the TC4 titanium alloyβThe normalizing treatment mode is carried out for 2h, and the TC4 titanium alloy with α phase proportion of 57.6% and β phase proportion of 42.4% is obtained, the metallographic microstructure diagram of the TC4 titanium alloy obtained by the heat treatment is shown in FIG. 13, and the metallographic microstructure diagram α phase (white) coloring and the statistic α phase account for the ratio shown in FIG. 14.
The results of the above examples further prove that the method of the invention can regulate and control the alpha phase proportion interval in the TC4 titanium alloy.

Claims (5)

1. A method for regulating and controlling the phase ratio of TC4 titanium alloy through heat treatment is characterized by comprising the following steps:
step 1: sanding TC4 titanium alloy to remove an oxide layer on the surface of the titanium alloy;
step 2: the ground TC4 titanium alloy is at TαNormalizing for 4h at the temperature of 4 ℃ to obtain the TC4 alloy with the proportion range of α phases of 80 percent or more and 90 percent or less.
2. A method for regulating and controlling the phase ratio of TC4 titanium alloy through heat treatment is characterized by comprising the following steps:
step 1: sanding TC4 titanium alloy to remove an oxide layer on the surface of the titanium alloy;
step 2: the ground TC4 titanium alloy is (T)αNormalizing at +30) deg.C for 4h to obtain TC4 alloy with α phase proportion range greater than 70%At a rate of 80%.
3. A method for regulating and controlling the phase ratio of TC4 titanium alloy through heat treatment is characterized by comprising the following steps:
step 1: sanding TC4 titanium alloy to remove an oxide layer on the surface of the titanium alloy;
step 2: the ground TC4 titanium alloy is at TβNormalizing for 2h at the temperature of 2 ℃ to obtain the TC4 alloy with the proportion range of α phases of more than or equal to 50 percent and less than 60 percent.
4. A method for regulating and controlling the phase ratio of TC4 titanium alloy through heat treatment is characterized by comprising the following steps:
step 1: sanding TC4 titanium alloy to remove an oxide layer on the surface of the titanium alloy;
step 2: the ground TC4 titanium alloy is (T)βNormalizing at +30) deg.C for 2h to obtain TC4 alloy with α phase proportion range of 40% or more and 50% or less.
5. A method for regulating and controlling the phase ratio of TC4 titanium alloy through heat treatment is characterized by comprising the following steps:
step 1: sanding TC4 titanium alloy to remove an oxide layer on the surface of the titanium alloy;
step 2: the ground TC4 titanium alloy is (T)βNormalizing at +70) deg.C for 2h to obtain the TC4 alloy in which the ratio of α phase is more than 30% and less than 40%.
CN202010649453.2A 2020-07-08 2020-07-08 Method for regulating TC4 titanium alloy phase ratio through heat treatment Pending CN111690889A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116145065A (en) * 2023-02-27 2023-05-23 沈阳工业大学 Multistage heat treatment method for improving vickers hardness of TC4 titanium alloy additive components

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Publication number Priority date Publication date Assignee Title
CN105483587A (en) * 2016-01-18 2016-04-13 合肥工业大学 Circulating thermo-hydrogenation treatment technology for improving room temperature plasticity of TC4 titanium alloy
WO2017191246A1 (en) * 2016-05-04 2017-11-09 Universite Libre De Bruxelles Method for manufacturing ti alloys with enhanced strength-ductility balance
CN109352279A (en) * 2018-11-14 2019-02-19 中国航发动力股份有限公司 A kind of die-forging forming method of TC4 titanium alloy circle-T shape Forging

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105483587A (en) * 2016-01-18 2016-04-13 合肥工业大学 Circulating thermo-hydrogenation treatment technology for improving room temperature plasticity of TC4 titanium alloy
WO2017191246A1 (en) * 2016-05-04 2017-11-09 Universite Libre De Bruxelles Method for manufacturing ti alloys with enhanced strength-ductility balance
CN109352279A (en) * 2018-11-14 2019-02-19 中国航发动力股份有限公司 A kind of die-forging forming method of TC4 titanium alloy circle-T shape Forging

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116145065A (en) * 2023-02-27 2023-05-23 沈阳工业大学 Multistage heat treatment method for improving vickers hardness of TC4 titanium alloy additive components
CN116145065B (en) * 2023-02-27 2024-06-11 沈阳工业大学 Multistage heat treatment method for improving vickers hardness of TC4 titanium alloy additive components

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