Characterization of nano-scale oxides in austenitic stainless steel processed by powder bed fusion

Fuyao Yan*, Wei Xiong, Eric Faierson, Gregory B. Olson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

51 Scopus citations

Abstract

Nano-scale MnSiO3 Rhodonite particles were observed in 316L stainless steel fabricated by selective laser melting (SLM). These oxide particles act as Zener-pinning particles providing dragging force to retard grain growth, and enhance strength through the comparison of Hall-Petch effects between SLM 316L and commercial wrought 316L under 1200 °C isothermal heat treatment. The metastable Rhodonite particles were observed to in-situ convert to stable MnCr2O4 Spinel particles at 1200 °C, as predicted by computational thermodynamics. This work introduces nano-scale oxides, which are normally detrimental inclusions, as a new type of particle for grain refinement and strengthening through their refinement in additive manufacturing.

Original languageEnglish (US)
Pages (from-to)104-108
Number of pages5
JournalScripta Materialia
Volume155
DOIs
StatePublished - Oct 2018

Keywords

  • Additive manufacturing
  • Austenitic stainless steel
  • Oxide

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

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