Static Coarsening Behavior of Laser Powder Directed Energy Deposited Ti-6.5Al-3.5Mo-1.5Zr-0.3Si Titanium Alloy  

作　　者：Yong Xie Zhenyu Yan Qingjun Zhou Jiaming Cao Xiaokang Liang Peng Dong Jiangtao Ni Fude Wang Guoqing Wang 

机构地区：[1]Capital Aerospace Machinery Corporation Limited,Beijing,100076,China [2]Wuhan National Laboratory for Optoelectronics(WNLO),Huazhong University of Science and Technology,Wuhan,430074,China [3]China Aerospace Science and Technology Corporation,Beijing,100076,China

出　　处：《Additive Manufacturing Frontiers》2024年第4期209-222,共14页增材制造前沿(英文)

基　　金：supported by National Key Research and Development Program of China(Grant No.2022YFB4602205).

摘　　要：The static coarsening behavior of laser powder directed energy deposited Ti-6.5Al-3.5Mo-1.5Zr-0.3Si titanium alloy and its effects on the alloy’s tensile properties were investigated.The static coarsening kinetics of the crab-like primary α(α_(P))and secondary α(α_(s))were satisfied by the Lifshitz-Slyozov-Wagner relationships.For the coarsening of the crab-like𝛼P,the coarsening efficiency(n)was satisfied at 0.25-0.35 for 910℃,whereas it was satisfied at 0.45-0.50 for 950 and 990℃.For the coarsening of the α_(s),the n was satisfied at 0.45-0.50 for 950℃ and 990℃.Compared to the as-built sample,the samples heat-treated at 910℃/2 h/air cooled and 950℃/2 h/air cooled exhibited good yield strength(930-1005.5 MPa),the highest elongation(14.5%-16.6%),and the lowest anisotropic ductility(0.6%)among all samples.The crab-like α_(P) and α_(s) increased the crack growth resistance and decreased the fracture difference in two different directions in the samples.

关 键 词：Laser powder directed energy deposition Titanium alloy Static coarsening Heat treatment 

分 类 号：TG1[金属学及工艺—金属学]