Mechanical Property Evaluation of a SLMed Martensitic Stainless Steel
来源期刊：Acta Metallurgica Sinica2020年第11期
论文作者：Yun Shi Zhengwu Liu Yi Yang Juan Hou Songquan Wu Jeremy H. Rao Kai Zhang Aijun Huang
文章页码：1466 - 1476
摘 要：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.
Yun Shi1,2，Zhengwu Liu1,2，Yi Yang4，Juan Hou4，Songquan Wu4，Jeremy H. Rao5，Kai Zhang4,6，Aijun Huang6
1. Shanghai Aerospace Equipments Manufacturer Co.,Ltd2. Shanghai Research Center of Complex Metal Parts by Additive Manufacturing4. School of Materials Science and Engineering , University of Shanghai for Science and Technology5. Future Industries Institute , University of South Australia6. Monash Centre for Additive Manufacturing (MCAM) , Monash University
摘 要：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.
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