CN104213060A - Heat treating method of TC4-DT titanium alloy bar - Google Patents
Heat treating method of TC4-DT titanium alloy bar Download PDFInfo
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- CN104213060A CN104213060A CN201410489741.0A CN201410489741A CN104213060A CN 104213060 A CN104213060 A CN 104213060A CN 201410489741 A CN201410489741 A CN 201410489741A CN 104213060 A CN104213060 A CN 104213060A
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- titanium alloy
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- air cooling
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Abstract
The invention provides a heat treating method of a TC4-DT titanium alloy bar. The method comprises the steps that the TC4-DT titanium alloy bar is firstly subjected to air cooling after being subjected to heat preservation for 1-2h under the condition that the temperature is (TBeta+5) DEG C to (TBeta+50) DEG C, is then subjected to air cooling or furnace cooling after being subjected to heat preservation for 1-2h under the condition that the temperature is (TBeta-80) DEG C to (TBeta-10) DEG C, and is finally subjected to air cooling after being subjected to heat preservation for 4-8h under the condition that the temperature is 500-600 DEG C, wherein TBeta is the Beta phase inversion temperature of the TC4-DT titanium alloy bar, and the unit of TBeta is DEG C. Through performing a three-stage heat treating process, the alloy plasticity of the TC4-DT titanium alloy bar is improved while the alloy fracture toughness of theTC4-DT titanium alloy bar is increased, the performance can be further enhanced, and excellent matching among the alloy intensity, plasticity and fracture toughness is finally realized.
Description
Technical field
The invention belongs to titanium alloy material processing technique field, be specifically related to a kind of heat treating method of TC4-DT titanium alloy rod bar.
Background technology
The damage tolerance performance of material mainly characterizes by fracture toughness property and crack growth rate.Along with the development of fracture mechanics and damage tolerance theory, damage tolerance design philosophy is paid attention in material selection, and the alloy of high-fracture toughness and low crack growth rate is subject to extensive concern.Titanium alloy due to have a series of advantage by aerospace applications as preferred material.Numerous researchs show, the damage tolerance performance that titanium alloy laminated structure has had, and therefore, β forging or β thermal treatment process are used as the working method of high damage tolerance performance conventionally, but lamellar structure declines the plasticity of alloy owing to having thick crystal grain.Experiment shows, β crystal grain internal sheets layer thickness and colony size can affect the damage tolerance performance of alloy, lamellar spacing increase can cause crackle deflecting direction in expansion process, colony size and position are to changing the deflection that also can cause crackle, the deflection meeting of crackle in expansion process consumes more multipotency, therefore caused high fracture toughness property and low crack growth rate.Common engineering adopts β to forge or β thermal treatment improves the damage tolerance performance of alloy, but has higher over-all properties in order to ensure alloy, does not fall low-alloyed plasticity, and the present invention has designed a kind of new thermal treatment process, is suitable for diphasic titanium alloy.
In order to obtain high damage tolerance performance, the heat treating method of traditional TC4-DT titanium alloy rod bar is mainly that sample is carried out to solution treatment at β phase region, put forward heavy alloyed fracture toughness property by the lamellar structure obtaining, but thick lamellar structure can cause the obvious reduction of stretching plastic, causes the loss of material plasticity.
Therefore how to obtain desired microstructure by the thermal treatment process of optimizing TC4-DT titanium alloy rod bar, further realize the matched well of the over-all propertieies such as alloy strength, plasticity, fracture toughness property, become the important component part of TC4-DT titanium alloy processing key technology.
Summary of the invention
Technical problem to be solved by this invention is, for above-mentioned the deficiencies in the prior art, to provide a kind of heat treating method of TC4-DT titanium alloy rod bar.The method, by carrying out three stage thermal treatment techniques, can make TC4-DT titanium alloy rod bar in improving alloy fracture toughness, improves the plasticity of alloy, and can further strengthen performance, finally realizes the matched well of alloy strength, plasticity, fracture toughness property.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of heat treating method of TC4-DT titanium alloy rod bar, it is characterized in that, and the method is: be first (T in temperature by TC4-DT titanium alloy rod bar
β+ 5) DEG C～(T
β+ 50) under condition DEG C, being incubated air cooling after 1h～2h, is then (T in temperature
β-80) DEG C～(T
β-10) under condition DEG C, be incubated after 1h～2h air cooling or stove cold, finally under temperature is the condition of 500 DEG C～600 DEG C, be incubated 4h～8h after air cooling, wherein T
βfor the β phase transition temperature of TC4-DT titanium alloy rod bar, T
βunit be DEG C.
The heat treating method of above-mentioned a kind of TC4-DT titanium alloy rod bar, is characterized in that, the method is: be first (T in temperature by TC4-DT titanium alloy rod bar
β+ 20) DEG C～(T
β+ 40) under condition DEG C, being incubated air cooling after 1h～2h, is then (T in temperature
β-40) DEG C～(T
β-20) under condition DEG C, be incubated after 1h～2h air cooling or stove cold, finally under temperature is the condition of 500 DEG C～600 DEG C, be incubated 5h～7h after air cooling.
The heat treating method of above-mentioned a kind of TC4-DT titanium alloy rod bar, is characterized in that, the method is: be first (T in temperature by TC4-DT titanium alloy rod bar
β+ 30) under condition DEG C, being incubated air cooling after 1.5h, is then (T in temperature
β-30) under condition DEG C, be incubated after 1.5h air cooling or stove cold, finally under temperature is the condition of 550 DEG C, be incubated 6h after air cooling.
The present invention compared with prior art has the following advantages:
1, the present invention adopts three stage thermal treatment techniques, wherein, the thermal treatment of first stage more than beta transformation point temperature 5～50 DEG C, air cooling processing after insulation 1h～2h, to ensure to obtain lamellar structure; The thermal treatment process of subordinate phase is air cooling or stove deepfreeze after 10～80 DEG C of insulation 1h～2h under beta transformation point, can make the lamella α alligatoring in β crystal grain, crackle can change extensions path during through the lamella α of alligatoring, thereby effectively put forward heavy alloyed toughness, can also improve the plasticity of alloy simultaneously; Finally, carry out air cooling ageing treatment at 500～600 DEG C of insulation 4～8h, also play assisted and strengthened effect with stabilizing tissue.
2, the present invention adopts three stage thermal treatment techniques, wherein the first stage more than beta transformation point processes and can obtain the lamellar structure that high-fracture toughness requires, in addition, first stage below beta transformation point processes, can make lamella α and the lamella boundling thickness of β intracrystalline increase, crackle in expansion process, runs into thicker lamella or boundling changes extensions path, consume more energy simultaneously, therefore fracture toughness property increases, the simultaneously generation of secondary α can cause the raising of alloy plasticity, further stabilizing tissue strengthen performance of final ageing treatment.By three stage thermal treatment techniques of the present invention, can make TC4-DT titanium alloy rod bar in improving alloy fracture toughness, improve the plasticity of alloy, and can further strengthen performance, finally realize the matched well of alloy strength, plasticity, fracture toughness property.
Below in conjunction with drawings and Examples, the present invention is described in further detail.
Brief description of the drawings
Fig. 1 is the metallographic structure figure of the TC4-DT titanium alloy rod bar after the embodiment of the present invention 1 thermal treatment.
Fig. 2 is the metallographic structure figure of the TC4-DT titanium alloy rod bar after comparative example 1 thermal treatment of the present invention.
Fig. 3 is the metallographic structure figure of the TC4-DT titanium alloy rod bar after comparative example 2 thermal treatments of the present invention.
Embodiment
Embodiment 1
The heat treating method of the present embodiment TC4-DT titanium alloy rod bar is:
Be (T by TC4-DT titanium alloy rod bar in temperature
β+ 30) under condition DEG C, being incubated air cooling after 1.5h, is then (T in temperature
β-30) after being incubated 1.5h under condition DEG C, stove is cold, finally under temperature is the condition of 550 DEG C, be incubated 6h after air cooling; Described T
βfor the β phase transition temperature of TC4-DT titanium alloy rod bar, T
βunit be DEG C.
Fig. 1 is shown in the metallographic structure of the TC4-DT titanium alloy rod bar after the present embodiment thermal treatment.The performance test data of the TC4-DT titanium alloy rod bar after the present embodiment thermal treatment is in table 1.
Embodiment 2
The heat treating method of the present embodiment TC4-DT titanium alloy rod bar is:
Be (T by TC4-DT titanium alloy rod bar in temperature
β+ 20) under condition DEG C, being incubated air cooling after 2h, is then (T in temperature
β-20) under condition DEG C, be incubated air cooling after 2h, finally under temperature is the condition of 500 DEG C, be incubated 5h after air cooling; Described T
βfor the β phase transition temperature of TC4-DT titanium alloy rod bar, T
βunit be DEG C.
The performance test data of the TC4-DT titanium alloy rod bar after the present embodiment thermal treatment is in table 1.
Embodiment 3
The heat treating method of the present embodiment TC4-DT titanium alloy rod bar is:
Be (T by TC4-DT titanium alloy rod bar in temperature
β+ 40) under condition DEG C, being incubated air cooling after 1h, is then (T in temperature
β-40) after being incubated 1h under condition DEG C, stove is cold, finally under temperature is the condition of 600 DEG C, be incubated 7h after air cooling; Described T
βfor the β phase transition temperature of TC4-DT titanium alloy rod bar, T
βunit be DEG C.
The performance test data of the TC4-DT titanium alloy rod bar after the present embodiment thermal treatment is in table 1.
Embodiment 4
The heat treating method of the present embodiment TC4-DT titanium alloy rod bar is:
Be (T by TC4-DT titanium alloy rod bar in temperature
β+ 5) under condition DEG C, being incubated air cooling after 2h, is then (T in temperature
β-80) under condition DEG C, be incubated air cooling after 2h, finally under temperature is the condition of 500 DEG C, be incubated 8h after air cooling; Described T
βfor the β phase transition temperature of TC4-DT titanium alloy rod bar, T
βunit be DEG C.
The performance test data of the TC4-DT titanium alloy rod bar after the present embodiment thermal treatment is in table 1.
Embodiment 5
The heat treating method of the present embodiment TC4-DT titanium alloy rod bar is:
Be (T by TC4-DT titanium alloy rod bar in temperature
β+ 50) under condition DEG C, being incubated air cooling after 1h, is then (T in temperature
β-10) after being incubated 1h under condition DEG C, stove is cold, finally under temperature is the condition of 600 DEG C, be incubated 4h after air cooling; Described T
βfor the β phase transition temperature of TC4-DT titanium alloy rod bar, T
βunit be DEG C.
The performance test data of the TC4-DT titanium alloy rod bar after the present embodiment thermal treatment is in table 1.
Comparative example 1
This comparative example adopts common two-phase region thermal treatment process.The heat treating method of this comparative example TC4-DT titanium alloy rod bar is: be (T by TC4-DT titanium alloy rod bar in temperature
β-30) after being incubated 1.5h under condition DEG C, stove is cold.Fig. 2 is shown in metallographic structure through this comparative example TC4-DT titanium alloy rod bar after treatment, and performance test data is in table 1.
Comparative example 2
This comparative example adopts common β phase region thermal treatment process.The heat treating method of this comparative example TC4-DT titanium alloy rod bar is: be (T by TC4-DT titanium alloy rod bar in temperature
β+ 50) under condition DEG C, be incubated air cooling after 1.5h.Fig. 3 is shown in metallographic structure through this comparative example TC4-DT titanium alloy rod bar after treatment, and performance test data is in table 1.
The performance test data of the TC4-DT titanium alloy rod bar of table 1 after thermal treatment of the present invention
From Fig. 1, Fig. 2, Fig. 3 and table 1, compare through conventional two-phase region performance test after treatment with comparative example 1, the performance that adopts the present invention TC4-DT titanium alloy rod bar after treatment changes little in the situation that in intensity and plasticity, and fracture toughness property is improved significantly.Compare through conventional β phase region performance test after treatment with comparative example 2, although adopt the present invention's TC4-DT titanium alloy rod bar after treatment intensity slightly to reduce, plasticity and fracture toughness property are all significantly improved.Therefore, adopt thermal treatment process of the present invention to heat-treat TC4-DT titanium alloy rod bar, can obtain the matched well of the strength of materials, plasticity, fracture toughness property.
The above, be only preferred embodiment of the present invention, not the present invention imposed any restrictions.Every any simple modification of above embodiment being done according to invention technical spirit, change and equivalence change, and all still belong in the protection domain of technical solution of the present invention.
Claims (3)
1. a heat treating method for TC4-DT titanium alloy rod bar, is characterized in that, the method is: be first (T in temperature by TC4-DT titanium alloy rod bar
β+ 5) DEG C～(T
β+ 50) under condition DEG C, being incubated air cooling after 1h～2h, is then (T in temperature
β-80) DEG C～(T
β-10) under condition DEG C, be incubated after 1h～2h air cooling or stove cold, finally under temperature is the condition of 500 DEG C～600 DEG C, be incubated 4h～8h after air cooling, wherein T
βfor the β phase transition temperature of TC4-DT titanium alloy rod bar, T
βunit be DEG C.
2. the heat treating method of a kind of TC4-DT titanium alloy rod bar according to claim 1, is characterized in that, the method is: be first (T in temperature by TC4-DT titanium alloy rod bar
β+ 20) DEG C～(T
β+ 40) under condition DEG C, being incubated air cooling after 1h～2h, is then (T in temperature
β-40) DEG C～(T
β-20) under condition DEG C, be incubated after 1h～2h air cooling or stove cold, finally under temperature is the condition of 500 DEG C～600 DEG C, be incubated 5h～7h after air cooling.
3. the heat treating method of a kind of TC4-DT titanium alloy rod bar according to claim 2, is characterized in that, the method is: be first (T in temperature by TC4-DT titanium alloy rod bar
β+ 30) under condition DEG C, being incubated air cooling after 1.5h, is then (T in temperature
β-30) under condition DEG C, be incubated after 1.5h air cooling or stove cold, finally under temperature is the condition of 550 DEG C, be incubated 6h after air cooling.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107099764A (en) * | 2017-04-25 | 2017-08-29 | 西北有色金属研究院 | A kind of Technology for Heating Processing for improving titanium alloy forging damage tolerance performance |
| CN107385371A (en) * | 2017-08-08 | 2017-11-24 | 西北有色金属研究院 | The processing method for obtaining the metastable beta titanium alloy of corynebacterium primary alpha phase tissue |
| CN108754370A (en) * | 2018-05-18 | 2018-11-06 | 中航金属材料理化检测科技有限公司 | A kind of heat treatment method of TC4-DT titanium alloys |
| CN111826594A (en) * | 2020-07-30 | 2020-10-27 | 北京理工大学 | Heat treatment method for manufacturing high-strength titanium alloy through electric arc additive manufacturing and reinforced high-strength titanium alloy |
| CN113088848A (en) * | 2021-04-20 | 2021-07-09 | 重庆大学 | Heat treatment method for simultaneously improving strength and plasticity of TC4 titanium alloy deposited by laser cladding |
| CN114182187A (en) * | 2021-12-14 | 2022-03-15 | 长沙理工大学 | Heat treatment method for improving toughness of titanium alloy pipe for oil gas |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107099764A (en) * | 2017-04-25 | 2017-08-29 | 西北有色金属研究院 | A kind of Technology for Heating Processing for improving titanium alloy forging damage tolerance performance |
| CN107385371A (en) * | 2017-08-08 | 2017-11-24 | 西北有色金属研究院 | The processing method for obtaining the metastable beta titanium alloy of corynebacterium primary alpha phase tissue |
| CN107385371B (en) * | 2017-08-08 | 2019-03-19 | 西北有色金属研究院 | The processing method for obtaining the metastable beta titanium alloy of corynebacterium primary alpha phase tissue |
| CN108754370A (en) * | 2018-05-18 | 2018-11-06 | 中航金属材料理化检测科技有限公司 | A kind of heat treatment method of TC4-DT titanium alloys |
| CN108754370B (en) * | 2018-05-18 | 2019-10-11 | 中航金属材料理化检测科技有限公司 | A kind of heat treatment method of TC4-DT titanium alloy |
| CN111826594A (en) * | 2020-07-30 | 2020-10-27 | 北京理工大学 | Heat treatment method for manufacturing high-strength titanium alloy through electric arc additive manufacturing and reinforced high-strength titanium alloy |
| CN111826594B (en) * | 2020-07-30 | 2021-09-28 | 北京理工大学 | Heat treatment method for manufacturing high-strength titanium alloy through electric arc additive manufacturing and reinforced high-strength titanium alloy |
| CN113088848A (en) * | 2021-04-20 | 2021-07-09 | 重庆大学 | Heat treatment method for simultaneously improving strength and plasticity of TC4 titanium alloy deposited by laser cladding |
| CN113088848B (en) * | 2021-04-20 | 2022-01-25 | 重庆大学 | Heat treatment method for simultaneously improving strength and plasticity of TC4 titanium alloy deposited by laser cladding |
| CN114182187A (en) * | 2021-12-14 | 2022-03-15 | 长沙理工大学 | Heat treatment method for improving toughness of titanium alloy pipe for oil gas |
| CN114182187B (en) * | 2021-12-14 | 2022-12-23 | 长沙理工大学 | Heat treatment method for improving toughness of titanium alloy pipe for oil gas |
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Application publication date: 20141217 |