CN103045979B - A kind of method preparing twin in TA1 tissue - Google Patents
A kind of method preparing twin in TA1 tissue Download PDFInfo
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- CN103045979B CN103045979B CN201210582294.4A CN201210582294A CN103045979B CN 103045979 B CN103045979 B CN 103045979B CN 201210582294 A CN201210582294 A CN 201210582294A CN 103045979 B CN103045979 B CN 103045979B
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- soaking time
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Abstract
The present invention relates to a kind of method preparing twin in TA1 tissue.Step of the present invention is as follows: TA1 test rod is put in 630 ~ 670 DEG C of air furnaces by the first step, and soaking time is greater than t, and described t should meet following formula: t=kD/ ⊿ T, and wherein: t is soaking time, unit is min; K is soaking time coefficient, gets 825; D is TA1 test rod diameter, and non-circular TA1 test rod gets minimum thickness, and unit is mm; ⊿ T is the temperature head that TA1 test rod bears, i.e. the difference of temperature and room temperature in air furnace; TA1 test rod takes out rapidly and is placed in 15 ~ 20 DEG C of room temperature air coolings by second step, is cooled to after room temperature again puts into the air furnace maintenance furnace temperature identical with the first step and soaking time until TA1 test rod; Namely first two steps as a cycle heat treatment cycle, more than 20 cycles of circulating are produced twin by the 3rd step in TA1 test rod tissue.Positively effect of the present invention is that preparation process is simple, easy to operate, produce twin ratio and can reach about 30%, and ratio is stablized.
Description
Technical field
The present invention relates to a kind of method preparing twin in TA1 tissue.
Background technology
The plastic deformation ability of metallic substance and slippage and twin closely related, slippage is as a kind of main mechanism of metal plastic deformation, when metal sliding deformation is obstructed, twin can play the effect regulating slip direction that slippage is proceeded, thus improves the plastic deformation ability of metallic substance.Carry out position by the twin in tissue to coordinate mutually, thus metal continuation distortion can be realized, improve the plastic deformation ability of metallic substance.TA1 is Patterns for Close-Packed Hexagonal Crystal structure, and during its distortion, slippage is few, is unfavorable for viscous deformation, but TA1 can be made to obtain larger deformability by the coordinative role of twin.
In metal, the mode of twin formation has three kinds usually, and one is by mechanical deformation, and two is formed when being grown up in gaseous state, liquid state, solid by crystal, and three is deformable metal recrystallization annealing.TA1 needs to carry out temperature by mechanical deformation generation twin to be needed to control, and can produce internal stress, tissue topography may change, and needs the thermal treatment process of follow-up complexity to eliminate, technological process more complicated after TA1 distortion in its tissue.TA1 crystal is grown up or recrystallization annealing produces twin, there is no detailed concrete technology at present.
Prepare twin in TA1 tissue and there is no concrete technology and parameter at present, this technique proposes the concrete grammar preparing twin in TA1 tissue first.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of method preparing twin in TA1 tissue, effectively can improve the plastic deformation ability of TA1.
For solving the problems of the technologies described above, the technical solution used in the present invention is as follows:
The present invention adopts step as follows:
(1) put in 630 ~ 670 DEG C of air furnaces by TA1 test rod, soaking time is greater than t, and described t should meet following formula: t=kD
/⊿ T,
Wherein: t is soaking time, unit is min;
K is soaking time coefficient, gets 825;
D is TA1 test rod diameter, and non-circular TA1 test rod gets minimum thickness, and unit is mm;
⊿ T is the temperature head that TA1 test rod bears, i.e. the difference of temperature and room temperature in air furnace;
(2) after step (1), TA1 test rod is taken out rapidly and be placed in 15 ~ 20 DEG C of room temperature air coolings, be cooled to until TA1 test rod and again put into air furnace after room temperature and keep the furnace temperature identical with step (1) and soaking time;
(3) be a cycle heat treatment cycle by step (1) and step (2), more than 20 cycles of circulating namely in TA1 test rod tissue, produce twin.
The beneficial effect adopting technique scheme to produce is that step is simple, easy to operate, produce twin ratio and can reach about 30%, and ratio is stablized by adopting the method for cycle heat treatment to prepare twin in TA1 tissue.
Accompanying drawing explanation
Accompanying drawing 1 is TA1 metallographic structure figure under the microscope before cycle heat treatment of the present invention.
Accompanying drawing 2 is TA1 metallographic structure figure under the microscope after cycle heat treatment of the present invention.
Accompanying drawing 3 is TA1 metallographic structure figure under transmission electron microscope before cycle heat treatment of the present invention.
Accompanying drawing 4 is TA1 metallographic structure figure under transmission electron microscope after cycle heat treatment of the present invention.
In accompanying drawing 2 and accompanying drawing 4, arrow points is the twin in crystal grain.
Embodiment
The step of embodiment 1 is as follows:
(1) be that the TA1 pole of 10mm is put in 650 DEG C of air furnaces by diameter, soaking time should be greater than 13.1min as calculated;
(2) after step (1), TA1 pole is taken out rapidly and be placed in 18 DEG C of room temperature air coolings, be cooled to after room temperature until TA1 pole and again put into air furnace, keep the furnace temperature identical with step (1) and soaking time;
(3) be a cycle heat treatment cycle by step (1) and step (2), more than 20 cycles of circulating namely in TA1 tissue, produce twin.
The step of embodiment 2 is as follows:
(1) be that the TA1 pole of 10mm is put in 670 DEG C of air furnaces by diameter, soaking time should be greater than 12.6min as calculated;
(2) after step (1), TA1 is taken out rapidly and be placed in 15 DEG C of room temperature air coolings, be cooled to after room temperature until TA1 and again put into air furnace, keep the furnace temperature identical with step (1) and soaking time;
(3) be a cycle heat treatment cycle by step (1) and step (2), more than 20 cycles of circulating namely in TA1 tissue, produce twin.
The step of embodiment 3 is as follows:
(1) be that the TA1 pole of 10mm is put in 630 DEG C of air furnaces by diameter, soaking time should be greater than 13.6min as calculated;
(2) after step (1), TA1 is taken out rapidly and be placed in 20 DEG C of room temperature air coolings, be cooled to after room temperature until TA1 and again put into air furnace, keep the furnace temperature identical with step (1) and soaking time;
(3) be a cycle heat treatment cycle by step (1) and step (2), more than 20 cycles of circulating namely in TA1 tissue, produce twin.
The twin effect that embodiment 1-embodiment 3 produces is see Fig. 1-Fig. 4.
In the present invention, the mechanism of twin formation is: to METAL HEATING PROCESS process peripheral metal prior to interior metal expanded by heating, interior metal can form tensile stress to external metallization; Meeting cold events to TA1 process of cooling peripheral metal prior to interior metal, external metallization produces stress to interior metal.Like this in constantly cycle heat treatment process, in metal structure, internal stress can be formed owing to colding and heat succeed each other.Because TA1 belongs to hexagonal close packed lattice structure, itself slip system is few, and deformability is poor.The slippage release be released through between atom solid matter face of internal stress is easily obstructed, and after slippage is obstructed, between lattice, position adjustment gradually of meeting is beneficial to slippage and proceeds, and lattice position adjusts mutually and can form contraction brilliant position phase, thus forms twin in the tissue.Therefore twin can be prepared in TA1 tissue after adopting this technique.
Claims (1)
1. in TA1 tissue, prepare a method for twin, it is characterized in that its step is as follows:
(1) put in 630 ~ 670 DEG C of air furnaces by TA1 test rod, soaking time is greater than t, and described t should meet following formula: t=kD/ ⊿ T,
Wherein: t is soaking time, unit is min;
K is soaking time coefficient, gets 825;
D is TA1 test rod diameter, and non-circular TA1 test rod gets minimum thickness, and unit is mm;
⊿ T is the temperature head that TA1 test rod bears, i.e. the difference of temperature and room temperature in air furnace;
(2) after step (1), TA1 test rod is taken out rapidly and be placed in 15 ~ 20 DEG C of room temperature air coolings, be cooled to until TA1 test rod and again put into air furnace after room temperature and keep the furnace temperature identical with step (1) and soaking time;
(3) be a cycle heat treatment cycle by step (1) and step (2), more than 20 cycles of circulating namely in TA1 test rod tissue, produce twin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210582294.4A CN103045979B (en) | 2012-12-28 | 2012-12-28 | A kind of method preparing twin in TA1 tissue |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210582294.4A CN103045979B (en) | 2012-12-28 | 2012-12-28 | A kind of method preparing twin in TA1 tissue |
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| CN103045979A CN103045979A (en) | 2013-04-17 |
| CN103045979B true CN103045979B (en) | 2015-09-30 |
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| CN201210582294.4A Expired - Fee Related CN103045979B (en) | 2012-12-28 | 2012-12-28 | A kind of method preparing twin in TA1 tissue |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101701330A (en) * | 2009-12-01 | 2010-05-05 | 西部超导材料科技有限公司 | Heat treatment method of medical titanium alloy small-sized bar |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63241149A (en) * | 1987-03-30 | 1988-10-06 | Toshiba Corp | Molybdenum macrocrystalline grain or single crystal and its production |
| JPH03249157A (en) * | 1990-02-27 | 1991-11-07 | Mitsubishi Heavy Ind Ltd | Method for vacuum heat treatment of active metal |
| JPH08209314A (en) * | 1994-10-28 | 1996-08-13 | Kazuhiro Otsuka | Production of shape memory alloy with high-temperature phase-transferring function |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101701330A (en) * | 2009-12-01 | 2010-05-05 | 西部超导材料科技有限公司 | Heat treatment method of medical titanium alloy small-sized bar |
Non-Patent Citations (1)
| Title |
|---|
| 彭超群."循环热处理对TiAl基合金组织与性能的影响".《中国优秀博硕士学位论文全文数据库(博士),工程科技Ⅰ辑,2002年第01期》.2002, * |
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