Selective laser melting of near-α titanium alloy Ti-6Al-2Zr-1Mo-1V:Parameter optimization,heat treatment and mechanical performance

• 作者: Chao Cai Xu Wu Wan Liu Wei Zhu Hui Chen Jasper Chua Dong Qiu Chen-Nan Sun Jie Liu Qingsong Wei Yusheng Shi
• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2020,（22）
• 页码范围: 51-64
• 页数: 14页
• 语种: 英文

摘要

This paper presents a comprehensive study conducted to optimize the selective laser melting (SLM)parameters and subsequent heat-treatment temperatures for near-α high-temperature titanium alloy Ti-6Al-2Zr-1Mo-1 V (TA15),which is widely used in the aerospace industry.Based on the surface mor-phology and relative density analysis,the optimized process parameters were:laser power from 230 W to 380W,scan speed from 675mm/s to 800mm/s,scan spacing of 0.12 mm,and layer thickness of 0.03 mm.The effects of the laser power and the layer thickness on the phase constitutions,microstruc-ture features,as well as room-temperature and high-temperature (500 ℃) tensile properties,were then studied to obtain an in-depth understanding of SLM-built TA15.Six typical temperatures (650,750,850,950,1000 and 1100℃) covering three representative temperature ranges,i.e.,martensite partial decomposition temperature range,martensite complete decomposition temperature range and above β transus temperature,were subsequently selected as heat-treatment temperatures.The heat treatment-microstructure-mechanical property relationships of SLM-built TA15 were elucidated in detail.These results provide valuable information on the development of SLM-built TA15 alloy for industrial appli-cations,and these findings are also beneficial to additive manufacturing of other near-α Ti alloys with desirable high-temperature properties.