Mechanical performance and deformation mechanisms at cryogenic temperatures of 316L stainless steel processed by laser powder bed fusion: in situ neutron diffraction

Lei Tang, Oxana V. Magdysyuk, Fuqing Jiang, Yiqiang Wang, Alexander Dominic Evans, Saurabh Kabra, Biao Cai

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Abstract

Manufacturing austenitic stainless steels (ASSs) using additive manufacturing is of great interest for cryogenic applications. Here, the mechanical and microstructural responses of a 316L ASS built by laser powder bed fusion were revealed by performing in situ neutron diffraction tensile tests at the low-temperature range (from 373 to 10 K). The stacking fault energy almost linearly decreased from 29.2 ± 3.1 mJm−2 at 373 K to 7.5 ± 1.7 mJm−2 at 10 K, with a slope of 0.06 mJm−2K−1, leading to the transition of the dominant deformation mechanism from strain-induced twinning to martensite formation. As a result, excellent combinations of strength and ductility were achieved at the low-temperature range.
Original languageEnglish
Article number114806
JournalScripta Materialia
Volume218
DOIs
Publication statusPublished - 19 May 2022

Keywords

  • Additive manufacturing
  • Austenitic stainless steel
  • Cryogenic deformation
  • Neutron diffraction

ASJC Scopus subject areas

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

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