|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Additive Manufacturing of Metals: Establishing Location Specific, Processing-Microstructure-Property-Relationships III
||Microstructural Development in Heat-treated 17-4 PH Stainless Steel Parts Prepared by Selective Laser Melting
||Yu Sun, Mark Aindow, Rainer Hebert
|On-Site Speaker (Planned)
17-4PH stainless steel is a martensitic stainless steel containing approximately 3 wt.% Cu. The alloy is strengthened by the precipitation of highly dispersed FCC-Cu particles. While wrought 17-4PH usually has a fully martensitic microstructure, additively manufactured (AM) 17-4PH parts produced by Selective Laser Melting (SLM) exhibit non-uniform microstructures containing a substantial fraction of retained austenite, leading to highly anisotropic material properties. As such, heat treatment of as-built parts is required to eliminate such heterogeneities and to promote the precipitation of Cu particles. To help develop a better understanding of the microstructural development, we have conducted a series of detailed scanning and transmission electron microscopy investigations on AM 17-4PH test parts in the as-manufactured condition and after subsequent heat-treatment. Data on the phases present, grain morphologies and elemental distributions are compared with observations on conventionally processed 17-4PH bar stock, and the consequences for the process design of AM 17-4PH are discussed.
||Planned: Supplemental Proceedings volume