Microstructure and mechanical properties of TC21 titanium alloy after heat treatment

作者：Shi, Zhi-feng^*; Guo, Hong-zhen; Han, Jin-yang; Yao, Ze-kun

来源：Transactions of Nonferrous Metals Society of China, 2013, 23(10): 2882-2889.

DOI：10.1016/S1003-6326(13)62810-1

• TC21 titanium alloy
• heat treatment
• microstructure
• mechanical properties

Microstructure evolutions during different heat treatments and influence of microstructure on mechanical properties of TC21 titanium alloy were investigated. The results indicate that the excellent mechanical properties can be obtained by adopting air cooling after forging followed by heat treatment of (900 degrees C, 1 h, AC)+(590 degrees C, 4 h, AC). Deformation in single beta field produces pan-like prior beta grains, while annealing in single beta field produces equiaxed prior beta grains. Cooling rate after forging or annealing in single beta field and the subsequent annealing on the top of alpha+beta field determine the content and morphology of coarse a plates. During aging or the third annealing, fine secondary a plates precipitate. Both ultimate strength and yield strength decrease with the content increase of coarse alpha plates. Decreasing effective slip length and high crack propagation resistance increase the plasticity. The crisscross coarse alpha plates with large thickness are helpful to enhance the fracture toughness.

• 出版日期2013-10
• 单位西北工业大学