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Mechanical Property Evaluation of a SLMed Martensitic Stainless Steel

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Acta Metallurgica Sinica (English Letters) Aims and scope

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.

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Acknowledgements

This work was supported by the National Key R&D Program of China (Grant No. 2018YFB1106100), the Shanghai Science and Technology Talents Program Fund (No. 19XD1431600) and the Shanghai Research Center of Complex Metal Parts by Additive Manufacturing (No. 14DZ2253600).

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Correspondence to Kai Zhang.

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Available online at http://link.springer.com/journal/40195.

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Shi, Y., Xiong, X., Liu, Z. et al. Mechanical Property Evaluation of a SLMed Martensitic Stainless Steel. Acta Metall. Sin. (Engl. Lett.) 33, 1466–1476 (2020). https://doi.org/10.1007/s40195-020-01128-7

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  • DOI: https://doi.org/10.1007/s40195-020-01128-7

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