Oxide Dispersion Strengthened (ODS) SS316L Prepared by Laser Powder Bed Fusion (L-PBF): Analysis of Microstructure and Hardness Properties

Access full-text files

Date

2023

Authors

Ma, Changyu
Lin, Yu-Keng
Zheng, Tianqi
Mallory, Phillip
Zhu, Jianhao
Morris Wang, Y.
Li, Xiaochun
Kang, Bruce
Li, Bingbing

Journal Title

Journal ISSN

Volume Title

Publisher

University of Texas at Austin

Abstract

In this paper, dense oxide dispersion-strengthened (ODS) SS316L with 0.5 wt.% Y2O3 was fabricated using nano-Y2O3-embedded spherical SS316L powder via laser powder bed fusion (LPBF). The molten pool, oxide dispersion, cellular structure, and microhardness of the as-printed ODS SS316L were investigated through optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive X-Ray Spectroscopy (EDX), and Vickers hardness testing, respectively. The results reveal a uniform dispersion of Y-rich nanoparticles in as-printed ODS SS316L, contributing to the development of a fine-grain structure in the as-printed ODS SS316L. A wide and shallow molten pool was observed in as-printed ODS SS316L, and enhanced microhardness was observed in ODS SS316L compared to pristine SS316L. The effects of Y2O3 on microstructure evolution and reinforcing mechanisms of microhardness are discussed.

Description

LCSH Subject Headings

Citation