Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 803, Issue -, Pages 30-41Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.06.289
Keywords
Selective laser melting; 17-4 PH stainless steel; Heat treatment; Tensile properties; Oxide dispersion strengthening
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Funding
- National Chung-Shan Institute of Science and Technology, Taiwan [NCSIST-201-V102(106)]
- Ministry of Science and Technology, Taiwan [MOST 107-3017-F-002-001]
- Advanced Research Center of Green Materials Science and Technology from The Featured Area Research Center Program within Ministry of Education, Taiwan [108L9006]
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Selective laser melting (SLM) process of 17-4 PH stainless steel has been a subject of research interest due to its complex microstructure-property correlation associated with SLM process. In this work, an oxide dispersion strengthened 17-4 PH stainless steel was successfully fabricated directly by SLM process with an oxygen content of 500 ppm in the chamber. It contained a matrix of ultrafine packet of martensite and reverted austenite with a dispersion of nano Mn-Si oxide particles that could provide strengthening by generation of geometrically necessary dislocations, making 17-4 PH an oxide dispersion strengthened material after the SLM process. Furthermore, post heat treatments could increase fractions of martensite and further induce either formation of ultrafine reverted austenite to promote significant transformation-induced plasticity during work hardening process or Cu-rich phase precipitation strengthening. This article not only describes a clear microstructure-property correlation for a SLM processed 17-4 PH, but also it shows the potential advantage of the SLM process in microstructure engineering. (C) 2019 Elsevier B.V. All rights reserved.
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