Characterization of nano-scale oxides in austenitic stainless steel processed by powder bed fusion. (October 2018)

• Record Type: Journal Article
• Authors: Yan, Fuyao; Xiong, Wei; Faierson, Eric; Olson, Gregory B.
• Is Part Of: Scripta materialia. Number 155(2018)
• Page Start: 104
• Page End: 108
• Publication Date: 2018-10
• Subjects: Additive manufacturing -- Austenitic stainless steel -- Oxide; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2018.06.011
• Languages: English
• ISSNs: 1359-6462

Abstract

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 MnCr2 O4 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. Graphical abstract: Unlabelled Image