Mechanical Property Evaluation of a SLMed Martensitic Stainless Steel
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Mechanical Property Evaluation of a SLMed Martensitic Stainless Steel Yun Shi1,2 · Xiaojing Xiong3 · Zhengwu Liu1,2 · Yi Yang4 · Juan Hou4 · Songquan Wu4 · Jeremy H. Rao5 · Kai Zhang4,6 · Aijun Huang6 Received: 17 April 2020 / Revised: 11 August 2020 / Accepted: 11 August 2020 / Published online: 4 September 2020 © The Chinese Society for Metals (CSM) and Springer-Verlag GmbH Germany, part of Springer Nature 2020
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. Keywords Selective laser melting · Microstructures · Tensile testing · Electron backscattered diffraction (EBSD) · Martensitic steel
1 Introduction Due to the high strength and excellent corrosion resistance, martensitic stainless steels (MSSs) with the chromium (Cr) content of more than 11 wt% have been widely used for components such as steam generators, offshore petroleum Yun Shi and Xiaojing Xiong have contributed equally to this work. Available online at http://link.springer.com/journal/40195. * Kai Zhang [email protected] 1
Shanghai Aerospace Equipments Manufacturer Co., Ltd, Shanghai 200245, China
2
Shanghai Research Center of Complex Metal Parts by Additive Manufacturing, Shanghai 200245, China
3
Monash (Suzhou) Engineering Technology Co., Ltd, Suzhou 215123, China
4
School of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
5
Future Industries Institute, University of South Australia, Mawson Lakes, SA 5095, Australia
6
Monash Centre for Additive Manufacturing (MCAM), Monash University, Clayton, VIC 3800, Australia
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platforms, valve seats and stem rods in petrochemical, marine and aerospace industries [1, 2]. Fully martensitic microstructures could be achieved through austenitizing heat treatment followed by quenching, while the ductility could be restored after subsequent tempering heat treatment [3]. Through the manipulation of the heat treatment process, the mechanical properties of MSSs could be tailored accordingly [3]. However, the fabrication methods of MSSs are mostly limited to cutting and machining [4], making the manufacturing of complex MSS components with internal channels extre
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