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Unique bottom-up microstructure hierarchy and improved mechanical properties in stainless steel formed by selective laser melting
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
(English)Article in journal (Refereed) Submitted
Abstract [en]

Selective laser melting was used for production of 316L stainless steel. The SLM 316L steel shows unique structural hierarchies from the macro-scale melt pools down to the submicron/nano scale intragranular cellular sub-grains. The Structural hierarchies and heterogeneities and associated dislocations increased the mechanical strength and hardness of the laser melted stainless steel samples to 700 MPa and 325HV. The small sized confined intragranular subgrains and multi scale interlocking of the subgrains ensured high yield strength of 456 MPa and good ductility. The mechanical properties are considerably higher than a fully densified HIP316L and conventional 316L steel and comparable to dual phase stainless steel.

Keyword [en]
laser processing, stainless steel, hierarchies, microstructure, hardness, mechanical properties
National Category
Materials Chemistry
Research subject
Materials Chemistry
Identifiers
URN: urn:nbn:se:su:diva-126540OAI: oai:DiVA.org:su-126540DiVA: diva2:901037
Available from: 2016-02-05 Created: 2016-02-05 Last updated: 2016-03-30Bibliographically approved

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Saeidi, KamranShen, Zhijian
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Department of Materials and Environmental Chemistry (MMK)
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