Mechanical property evaluation of a SLMed martensitic stainless steel

Yun Shi, Xiaojing Xiong, Zhengwu Liu, Yi Yang, Juan Hou, Songquan Wu, Jeremy H. Rao, Kai Zhang, Aijun Huang

Research output: Contribution to journalArticleResearchpeer-review

Abstract

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.

Original languageEnglish
Pages (from-to)1466–1476
Number of pages11
JournalActa Metallurgica Sinica (English Letters)
Volume33
Issue number11
DOIs
Publication statusPublished - Nov 2020

Keywords

  • Electron backscattered diffraction (EBSD)
  • Martensitic steel
  • Microstructures
  • Selective laser melting
  • Tensile testing

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