CN103712849B - A kind of method studying different-shape α phase content and Relationship between Mechanical in diphasic titanium alloy - Google Patents
A kind of method studying different-shape α phase content and Relationship between Mechanical in diphasic titanium alloy Download PDFInfo
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Abstract
The present invention relates to a kind of method studying different-shape α phase content and Relationship between Mechanical in diphasic titanium alloy, by the content adopting suitable Technology for Heating Processing to change different-shape α phase in alloy, and performance test is carried out to the sample obtained, α phase content data and performance data are carried out matching or interpolation processing in Three-dimensional triangle coordinate system, in Three-dimensional triangle coordinate, draw relevant performance surface, and the angle of utility curved surface level line and coordinate axis determines the Main Tissues factor affecting titanium alloy mechanical property.The invention has the beneficial effects as follows: by titanium alloy performance and its tissue content data matching in Three-dimensional triangle coordinate system, obtain the relation of titanium alloy mechanical property and different-shape α phase content; According to the angle of three coordinate axis in performance level line and trigonometric coordinates, find out the Main Tissues parameter affecting titanium alloy mechanical property.
Description
Technical field
The present invention relates to a kind of method studying titanium alloy structure property relation, particularly study the content of different-shape α phase and the method for its Relationship between Mechanical in diphasic titanium alloy.
Background technology
The microstructure of titanium alloy has important impact to its mechanical property, changes the marked change that microstructure can cause its mechanical property.Under room temperature state, diphasic titanium alloy is usually by α phase and β phase composition.Through two-phase region processing and after double annealing thermal treatment, α Entropy density deviation remains in β phase, and may present thick sheet, etc. the pattern such as axle and tiny sheet.Thick sheet α phase be titanium alloy through high temperature process or solid solution, then to be formed after high annealing (annealing temperature lower than processing or solid solubility temperature); Deng the result that axle α phase is the complete nodularization of thick sheet α phase; And tiny sheet α phase is mainly formed in process annealing process, generally itself and residual β phase are referred to as the β matrix of tiny sheet α phase ageing strengthening.
The change of different-shape α phase content can cause the change of titanium alloy performance.Such as, document 1 " Wang Jinyou; Fu Zuoyi; section Jun; Wang Xiaozhou; Hu great Wei. microstructure is on the impact [C] of Ti-1023 titanium alloy fracture toughness property. titanium science and technology: the 6th national titanium or titanium alloy seminar collected works (2), 1987:187-192 " disclose the relation of primary alpha phase content and tensile property and fracture toughness.This article points out the increase (the β matrix of tiny sheet α phase ageing strengthening simultaneously reduces) with primary alpha phase content, and the intensity of Ti-1023 alloy reduces, and plasticity and fracture toughness increase.But wherein organizational parameter only has two kinds (β matrixes of primary alpha phase and the ageing strengthening of tiny sheet α phase), one of them content increases, another content must reduce, therefore can not determine alloy strength reduction (or plasticity, toughness increase) mainly caused by increasing of primary alpha phase, or reduced by the β matrix of tiny sheet α phase ageing strengthening and cause.
Summary of the invention
The technical matters solved
In order to avoid the deficiencies in the prior art part, the present invention proposes a kind of method studying different-shape α phase content and Relationship between Mechanical in diphasic titanium alloy, to determine the relation of different-shape α phase content in the mechanical property of titanium alloy and its tissue, and find out the Main Tissues factor affecting its mechanical property.
Technical scheme
Study a method for different-shape α phase content and Relationship between Mechanical in diphasic titanium alloy, it is characterized in that step is as follows:
Step 1, selection and technological preparation: select original structure by etc. the diphasic titanium alloy that forms of the β matrix strengthened of axle α phase and tiny sheet α phase, and can ensure that original structure is being heated to transformation temperature T
βa certain temperature T below
0time, tiny sheet α phase disappears completely, and α phase is only to wait form of axle to exist; If meet this condition, known this titanium alloy of working as is heated to T
0~ T
βduring interval a certain temperature, α phase only exists with equiaxed form; Described T
0with T
βhaving enough intervals, is T
β≤ T
0+ 40 DEG C;
Step 2, thermal treatment: at (T
0, T
β) temperature range gets n the temperature spot at equitemperature interval, is designated as T respectively from low to high
1, T
2, T
3t
n; Get (n+1) (n+2)/2 group sample, in two-phase region, triple annealing thermal treatment is carried out to (n+1) (n+2)/2 group sample; First two steps annealing in process system is T
x, Xh/AC+T
y, Yh/OQ, its first time annealing temperature T
x, second time annealing temperature T
yvalue provided by following table; Annealing in process system is T for the third time
a, Zh/AC; Described first time annealing time X will ensure that the tiny sheet α phase in original structure disappears completely, n≤1;
Step 3, Mechanics Performance Testing: carrying out Mechanics Performance Testing to often organizing sample, obtaining the data of ultimate strength, yield strength, extensibility, reduction of area and fracture toughness;
Step 4, measure the content of different-shape α phase: the sample through Mechanics Performance Testing to be ground, polishing and corrosion treatment, then under optical microscope or electron microscope, gather the microstructure picture of alloy, image analysis software is adopted to measure the microstructure of alloy, obtain the content data of the β matrix that alloy medium axle α phase, thick sheet α phase and tiny sheet α phase are strengthened, and by the content of each group of sample with coordinate (a, b, c) be labeled in triangular coordinate system;
Step 5, set up structure property relation curved surface: by three kinds of α phase content data (a, b, c) matching or interpolation calculation is carried out with performance data, draw titanium alloy mechanical property and different-shape α phase content relation in tissue, and in 3-D triangle coordinate system, be vertical shaft data with mechanical property, obtain the performance surface of studied alloy;
Step 6, affect the determination of performance Main Tissues factor: any point (a on calculated performance curved surface, b, c, m) in contour plane along the angle of isocontour tangent line and three coordinate axis, if be less than 30 ° with one of them coordinate axis angle, then illustrate that any point (a, b, c) place affects the tissue topography of Main Tissues factor representated by this coordinate axis corresponding vertex of alloy property; The institute meeting this condition a little forms a region under triangular coordinate system, then, in this region, the Main Tissues factor affecting alloy mechanical property is above-mentioned tissue topography.
When the original structure of the diphasic titanium alloy that described step 1 is selected does not meet the condition of step 1, by adopting heat processing technique to be met to the diphasic titanium alloy selected.
Described temperature interval is greater than 10 DEG C.
Mechanics Performance Testing in described step 3 is carried out repeatedly, and to results averaged repeatedly, as the mechanical performance data of alloy under this condition.
Beneficial effect
A kind of method studying different-shape α phase content and Relationship between Mechanical in diphasic titanium alloy that the present invention proposes, by the content adopting suitable Technology for Heating Processing to change different-shape α phase in alloy, and performance test is carried out to the sample obtained, α phase content data and performance data are carried out matching or interpolation processing in Three-dimensional triangle coordinate system, in Three-dimensional triangle coordinate, draw relevant performance surface, and the angle of utility curved surface level line and coordinate axis determines the Main Tissues factor affecting titanium alloy mechanical property.
The invention has the beneficial effects as follows: by titanium alloy performance and its tissue content data matching in Three-dimensional triangle coordinate system, obtain the relation of titanium alloy mechanical property and different-shape α phase content; According to the angle of three coordinate axis in performance level line and trigonometric coordinates, find out the Main Tissues parameter affecting titanium alloy mechanical property.
Accompanying drawing explanation
Fig. 1 is TC21 titanium alloy original structure of the present invention: wait the β matrix that axle α phase is strengthened with tiny sheet α phase;
Fig. 2 is the trigonometric coordinates system that the different α phase content of the present invention three kinds is formed;
Fig. 3 is the Main Tissues parameter affecting TC21 titanium alloy ultimate strength in trigonometric coordinates system of the present invention.
Embodiment
Now in conjunction with the embodiments, the invention will be further described for accompanying drawing:
Following examples are with reference to accompanying drawing 1 ~ 3.
The present embodiment is a kind of method studying diphasic titanium alloy TC21 alloy ultimate strength and different-shape α phase content relation, be characterized in comprising selection and technological preparation, thermal treatment, Mechanics Performance Testing, the mensuration of different-shape α phase content, the foundation of structure property relation and affect the determination of performance Main Tissues factor, specific as followsly state step:
Step 1, selection and technological preparation: TC21 titanium alloy, its original structure forms (as shown in Figure 1) by the β matrix waiting axle α phase and tiny sheet α phase to strengthen, and measuring transformation temperature is 960 DEG C, and the temperature that tiny sheet α phase disappears completely is 900 DEG C.
Step 2, thermal treatment: get in (900 DEG C, 960 DEG C) temperature range 3 temperature spots that temperature interval is 15 DEG C, be respectively 915 DEG C, 930 DEG C, 945 DEG C.Get 10 groups of samples, according to the form below carries out triple annealing thermal treatment to often organizing TC21 titanium alloy sample respectively.
Step 3, Mechanics Performance Testing: carry out room temperature tensile properties test to often organizing sample according to GB/T228.1-2010, averages to 4 test results often organizing sample, obtains the ultimate strength data of TC21 titanium alloy;
Step 4, the mensuration of different-shape α phase content: the TC21 titanium alloy sample tested through room temperature tensile properties is ground, polishing, the process such as corrosion.Gather the microstructure picture of alloy under an optical microscope, the microstructure of Image-ProPlus software alloy is adopted to carry out statistical survey, obtain the content of the β matrix waiting axle α phase, thick sheet α phase and tiny sheet α phase to strengthen, and by the content of each group with coordinate (a, b, c) be labeled in (as shown in Figure 2) in triangular coordinate system.
Step 5, the foundation of structure property relation: TC21 titanium alloy three kinds of α phase content data (a, b, c) and ultimate strength data are carried out interpolation calculation, in 3-D triangle coordinate system, is vertical shaft data with ultimate strength, draws out ultimate strength curved surface;
Step 6, affects the determination of performance Main Tissues factor: on calculating limit yield surface every bit (a, b, c, m) in contour plane along the angle of isocontour tangent line and three coordinate axis; By tangent line and wait axle α corresponding coordinate axis angle to be less than 30 ° institute a little (a, b, c) in trigonometric coordinates system, mark (as shown in Figure 3) with region C, the Main Tissues factor affecting alloy ultimate strength this region in is the content of phase such as α such as axle such as grade; Corresponding with thick sheet α for tangent line coordinate axis angle is less than 30 ° institute a little (a, b, c) in trigonometric coordinates system, mark (as shown in Figure 3) with region A, the Main Tissues factor affecting alloy ultimate strength in this region is the content of thick sheet α phase; Institute a little (a that the β matrix respective coordinates axle clamp angle of tangent line and tiny sheet α phase being strengthened is less than 30 °, b, c) mark (as shown in Figure 3) with region B in trigonometric coordinates system, the Main Tissues factor affecting alloy ultimate strength in this region is the content of the β matrix that tiny sheet α phase is strengthened.
Claims (4)
1. study a method for different-shape α phase content and Relationship between Mechanical in diphasic titanium alloy, it is characterized in that step is as follows:
Step 1, selection and technological preparation: select original structure by etc. the diphasic titanium alloy that forms of the β matrix strengthened of axle α phase and tiny sheet α phase, and can ensure that original structure is being heated to transformation temperature T
βa certain temperature T below
0time, tiny sheet α phase disappears completely, and α phase is only to wait form of axle to exist; If meet this condition, known this titanium alloy of working as is heated to T
0~ T
βduring interval a certain temperature, α phase only exists with equiaxed form; Described T
0with T
βhaving enough intervals, is T
β≤ T
0+ 40 DEG C;
Step 2, thermal treatment: at (T
0, T
β) temperature range gets n the temperature spot at equitemperature interval, is designated as T respectively from low to high
1, T
2, T
3t
n; Get (n+1) (n+2)/2 group sample, in two-phase region, triple annealing thermal treatment is carried out to (n+1) (n+2)/2 group sample; First two steps annealing in process system is T
x, Xh/AC+T
y, Yh/OQ, its first time annealing temperature T
x, second time annealing temperature T
yvalue provided by following table; Annealing in process system is T for the third time
a, Zh/AC; Described first time annealing time X will ensure that the tiny sheet α phase in original structure disappears completely, n≤1;
Step 3, Mechanics Performance Testing: carrying out Mechanics Performance Testing to often organizing sample, obtaining the data of ultimate strength, yield strength, extensibility, reduction of area and fracture toughness;
Step 4, measure the content of different-shape α phase: the sample through Mechanics Performance Testing to be ground, polishing and corrosion treatment, then under optical microscope or electron microscope, gather the microstructure picture of alloy, image analysis software is adopted to measure the microstructure of alloy, obtain the content data of the β matrix that alloy medium axle α phase, thick sheet α phase and tiny sheet α phase are strengthened, and by the content of each group of sample with coordinate (a, b, c) be labeled in triangular coordinate system;
Step 5, set up structure property relation curved surface: by the content data (a of the β matrix that medium for alloy axle α phase, thick sheet α phase and tiny sheet α phase are strengthened, b, c) matching or interpolation calculation is carried out with performance data, draw titanium alloy mechanical property and different-shape α phase content relation in tissue, and in 3-D triangle coordinate system, be vertical shaft data with mechanical property, obtain the performance surface of studied alloy;
Step 6, affect the determination of performance Main Tissues factor: any point (a on calculated performance curved surface, b, c, m) in contour plane along the angle of isocontour tangent line and three coordinate axis, if be less than 30 ° with one of them coordinate axis angle, then illustrate that any point (a, b, c) place affects the tissue topography of Main Tissues factor representated by this coordinate axis corresponding vertex of alloy property; The institute meeting this condition a little forms a region under triangular coordinate system, then, in this region, the Main Tissues factor affecting alloy mechanical property is above-mentioned tissue topography.
2. the method for different-shape α phase content and Relationship between Mechanical in research diphasic titanium alloy according to claim 1, it is characterized in that: when the original structure of the diphasic titanium alloy that described step 1 is selected does not meet the condition of step 1, by adopting heat processing technique to be met to the diphasic titanium alloy selected.
3. the method for different-shape α phase content and Relationship between Mechanical in research diphasic titanium alloy according to claim 1, is characterized in that: described temperature interval is greater than 10 DEG C.
4. the method for different-shape α phase content and Relationship between Mechanical in research diphasic titanium alloy according to claim 1, it is characterized in that: the Mechanics Performance Testing in described step 3 is carried out repeatedly, and to results averaged repeatedly, as the mechanical performance data of alloy under this condition.
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| CN109030551A (en) * | 2017-06-12 | 2018-12-18 | 深圳市爱能森科技有限公司 | A kind of method of quick searching ternary molten salt system minimum fusing point |
| CN108760784B (en) * | 2018-04-03 | 2021-04-09 | 安徽大学 | Quantitative analysis method for metallographic volume fraction gradient distribution of surface layer of cutting processing of dual-phase titanium alloy |
| CN109283205B (en) * | 2018-10-19 | 2021-03-26 | 中国航发北京航空材料研究院 | Method for measuring volume fraction of primary alpha phase in titanium alloy structure |
| CN113624793B (en) * | 2020-05-07 | 2023-09-26 | 中国航发商用航空发动机有限责任公司 | Method for judging whether beta spot defect exists in near beta titanium alloy |
| CN112258603B (en) * | 2020-10-30 | 2021-09-21 | 西南石油大学 | Three-axis layout drawing method for analyzing rule of three-factor composite influence and application thereof |
| CN113889195A (en) * | 2021-08-24 | 2022-01-04 | 中国科学院金属研究所 | Method for predicting alpha-sub-phase morphology through titanium alloy beta parent phase crystal orientation |
| CN114561533B (en) * | 2022-04-08 | 2024-03-12 | 攀钢集团研究院有限公司 | Processing method of crystal flowers on surface of pure titanium sheet |
| CN116005090A (en) * | 2023-01-06 | 2023-04-25 | 中国航空制造技术研究院 | Heat treatment process for improving toughness of 1500 MPa-level titanium alloy |
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