Mechanical Property Evaluation of a SLMed Martensitic Stainless Steel

• 作 者: Yun Shi Xiaojing Xiong Zhengwu Liu Yi Yang Juan Hou Songquan Wu Jeremy H.Rao Kai Zhang Aijun Huang
• 机 构: Shanghai Aerospace Equipments Manufacturer Co., Ltd,Shanghai 200245, China;Shanghai Research Center
• 出 处: 金属学报（英文版）
• 发表日期: 2020年11期
• 关键词: Selective laser melting Microstructures Tensile testing Electron backscattered d

A martensitic stainless steel AISI420 fabricated by selective laser melting (SLM) and post-processed by austenitizing and tempering heat treatment was investigated in this study.The as-fabricated SLMed AISI420 showed a strong mechanical property anisotropy and low ductility in the longitudinal direction.Detailed microstructural characterization revealed the presence of austenite and a relatively sharp solidification texture in the as-fabricated state,while the sharp texture was considered as the cause for the mechanical property anisotropy.In contrast,a fully martensitic microstructure with a very weak texture was achieved after the austenitizing and tempering heat treatment.The mechanical property anisotropy was also fully eliminated,witnessing a significant improvement in the ductility,and thus,comparable mechanical performance with the wrought product was achieved in this study.