Effect of thermal deformation on microstructure and properties of TC18 titanium alloy produced by laser additive manufacturing

• 作者: Chang-yue Qiu Dong-dong Zheng Hong-fang Wang Shu-quan Zhang Xiao-dong Li Yan-yan Zhu Yu-ting Liu
• 来源期刊: 钢铁研究学报（英文版）
• 年，卷（期）: 2020,（12）
• 所属期刊栏目: ORIGINAL PAPERS
• 页码范围: 1476-1484
• 页数: 9页
• 语种: 英文

摘要

Grain boundary of α phase damaged ductility of laser melting-deposited TC18 titanium alloy and grain boundary of α phases were difficult to break by nominal heat treatment. An extra thermal deformation was introduced to break the grain boundary of α phase with the improved mechanical property of TC18 titanium alloy fabricated by laser melting deposition technique.Results indicated that after thermal deformation, β grains in alloy seriously elongated. When sample was deformed at temperatures from 750 to 850 ℃, α phase exhibited both rod and irregular morphologies with discontinuous distribution at grain boundary, and the subsequent heat treatment would lead to spheroidization of the α phase. However, after deformation at 900 ℃, α phase transferred into β phase and the subsequent heat treatment would make continuous grain boundary of α phase reappear. The suitable hot deformation can effectively break the continuous grain boundary in laser melting-deposited TC18 alloy with respected improved ductility.