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Subgrain-controlled grain growth in the laser-melted 316 L promoting strength at high temperatures
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0003-4888-6237
2018 (English)In: Royal Society Open Science, E-ISSN 2054-5703, Vol. 5, no 5, article id 172394Article in journal (Refereed) Published
Abstract [en]

Stainless steel 316 L prepared by laser melting consisted of a hierarchical austenitic microstructure with micrometresized (10–25 µm) grains containing fine 1 µm subgrains with a cellular structure. At high-temperature thermal treatments (greater than or equal to 1100°C), merging and growth of the 1 µm subgrains into bigger subgrains restricted the rapid grain growth and microstructure coarsening. Partial phase transformation of austenite to ferrite at temperatures greater than or equal to 1100°C, in combination with gradual and steady growth of subgrains inside the micrometre-sized grains and nucleation of the sigma phase, has promoted the tensile strength of stainless steel 316 L to 300 MPa at 1100°C compared with that of conventionally made 316 L counterparts (approx. 40 MPa). The grain growth mechanism of the laser-melted microstructure can change the application criteria for 316 L and expand the application fields for 316 L.

Place, publisher, year, edition, pages
Royal Society Publishing , 2018. Vol. 5, no 5, article id 172394
Keywords [en]
selective laser melting, thermal treatment, grain growth, mechanical properties
National Category
Metallurgy and Metallic Materials Other Materials Engineering
Research subject
Engineering Materials
Identifiers
URN: urn:nbn:se:ltu:diva-68816DOI: 10.1098/rsos.172394ISI: 000433498000084PubMedID: 29892424Scopus ID: 2-s2.0-85046652071OAI: oai:DiVA.org:ltu-68816DiVA, id: diva2:1208927
Note

Validerad;2018;Nivå 2;2018-05-21 (andbra)

Available from: 2018-05-21 Created: 2018-05-21 Last updated: 2018-06-28Bibliographically approved

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