|
|
Effects of different types of twinning on microstructure and mechanical properties of a strongly textured TA2 commercially pure titanium alloy subjected to rolling at ambient and cryogenic temperatures |
Jin-ru Luo1 Xiao Song2 Mao-yin Wang1 |
1 Institute of Materials, China Academy of Engineering Physics, Mianyang 621908, Sichuan, China 2 State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China |
|
|
Abstract Strongly textured commercially pure titanium alloy TA2 plates with different initial textures have been rolled at cryogenic and ambient temperatures to 4% reduction and then post-annealed at 50 ?C for 12 h. Microstructures of the samples were investigated using electron backscatter diffraction. The mechanical property of the sheets was tested via quasi-static uniaxial tensile tests along the rolling direction at room temperature. The effects of initial texture and rolling temperature on twin activity and mechanical property have been investigated. Twinning is very active in TA2 titanium during rolling at either room or cryogenic temperature. (1122) contraction twins can be observed in all the sheets and are the dominant twin mode for the sheets with an initial texture having c-axes parallel to the normal direction (ND). Extension twins have rarely been seen in sheets having an initial texture with c-axes parallel to ND, but play quite an important role in the sheets having an initial texture with c-axes perpendicular to ND. The initial texture of the sheet is considered to determine the twin mode while the cryogenic rolling temperature is found to increase the numbers of twins. Post-annealing does not change obviously the rolled microstructure. After annealing, the strength decreases and elongation to fracture slightly increases. The cryorolled sample has the better strength with little loss in elongation, and this mechanical enhancement is attributed to massive twinning.
|
|
|
|
|
[1] |
SUN Bin��YOU Hong-guang��HAO Ming-xin. Kinetics of high temperature oxidation of 0.09C-0.5Mn-0.22/1.9Si steel[J]. , 2018, 53(9): 53-56. |
[2] |
MA Li-dong����HUANG Qing-xue����CHEN Shuo��MA Hao-xi. Optimization of varying curvature profile of two-roll bar straightener[J]. , 2018, 53(9): 45-52. |
[3] |
ZHAO Jun-pu ����LIU Liu��RAO Jin-yuan. Effect of solidification reduction process on center compactness of continuous casting bloom[J]. , 2018, 53(9): 30-36. |
[4] |
MIAO Zhi-qi��CHENG Guo-guang��LI Shi-jian��CHEN Lie��LIU Zhi-quan��LI Cheng-wei. Mathematical model of electrode immersing depth in industrial electroslag remelting process and application[J]. , 2018, 53(9): 25-29. |
[5] |
GAO Jian-bing��CHANG Peng-fei��ZHANG Bin-bin��JIANG Zhou-hua��LI Hua-bing. Effect of Ce on inclusion modification in a new type super duplex stainless steel 2707HD[J]. , 2018, 53(9): 37-44. |
[6] |
LI Chen-xiao����WANG Shu-huan����XUE Yue-kai����ZHAO Ding-guo����ZHANG Ming-bo��HAN Yu. Experiment on gasification dephosphorization with coke powder reducing converter molten slag[J]. , 2018, 53(9): 20-24. |
|
|
|
|