Selective laser melting and heat treatment of precipitation hardening stainless steel with a refined microstructure and excellent mechanical properties. (15th March 2020)

• Record Type: Journal Article
• Authors: Nong, X.D.; Zhou, X.L.; Li, J.H.; Wang, Y.D.; Zhao, Y.F.; Brochu, M.
• Is Part Of: Scripta materialia. Number 178(2020)
• Page Start: 7
• Page End: 12
• Publication Date: 2020-03-15
• Subjects: Selective laser melting -- Retained austenite -- 15-5PH -- Microstructure -- Mechanical properties; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2019.10.040
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: In this study, we concentrated on the microstructural characteristics and mechanical properties of precipitation hardening (PH) stainless steel 15-5PH via Selective laser melting (SLM). A large amount of retained austenite was observed in the as-built samples which contribute to excellent ductility. The amount of retained austenite reduced greatly after heat treatment and the remaining minor retained austenite completely transformed to martensite during tensile process. A finer grain structure and a concentration of dislocations around the inclusions and at the submicron grain boundaries following heat treatment promoted SLM 15-5PH to demonstrate a higher strength than those of wrought samples. Graphical abstract: Image, graphical abstract