Original Article
  • Super Duplex Stainless Steel Matrix Composites with High Strength and Favorable Ductility Achieved Through Laser Powder Bed Fusion and Powder Mixture

  • Yongjian Fang*, Yali Zhang*, Jonghwan Suhr*†

  • * School of Mechanical Engineering, Sungkyunkwan University, Suwon 16419, Korea

  • This article is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

:In order to evade the premature failure of super duplex stainless steels (SDSSs) in some harsh environments, the increase of their mechanical properties is a promising approach. In this study, based on the laser powder bed fusion (LPBF) technique, SDSS matrix composites without post heat treatment were fabricated by using the powder mixture of SDSSs, super austenitic stainless steels (SASSs) and micron-sized TiC particles. Many in-situ TiCxNy nanoparticles were found to be formed by using micron-sized TiC particles in as-built composites, and both fine ferrite and austenite grains were generated. The as-built composites exhibited an excellent combination of high ultimate tensile strength (UTS) (~1066 MPa) and good uniform elongation (UE) (~15.6%), showing a better mechanical property compared with other reported LPBF-fabricated SDSSs, which was mainly attributed to the fine grain, Orowan and dislocation strengthening mechanisms. In particular, the successful fabrication of SDSS matrix composites can set the stage for producing high-performance metallic parts via LPBF technique.


Keywords: Laser powder bed fusion, Super duplex stainless steels, Super austenitic stainless steels, Metal matrix composites, Mechanical properties

This Article

Correspondence to

  • Jonghwan Suhr

  • * School of Mechanical Engineering, Sungkyunkwan University, Suwon 16419, Korea

  • E-mail: suhr@skku.edu