Structural evolution during nanostructuring of additive manufactured 316L stainless steel by high-pressure torsion

Jae Kyung Han, Xiaojing Liu, Isshu Lee, Yulia O. Kuzminova, Stanislav A. Evlashin, Klaus Dieter Liss, Megumi Kawasaki*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

This study investigates the structural evolution including crystallite size, micro-strain, and lattice parameters of an additive manufactured 316L stainless steel during post-printing nanostructuring by high-pressure torsion (HPT) at room temperature. Formation of a martensite phase was observed in the nanostructured austenitic steel having an average grain size of 60 nm after 8 HPT turns. Significant strain gradients exist between the close-packed planes and out-of-close-packed-planes in the nanocrystalline structure, while such strain gradient was not observed in the as-built material. Structural changes occur in a very early stage of nanostructuring through 1/2 HPT turn and are attributed to severe lattice distortion by the excess of dislocations and defects.

Original languageEnglish
Article number130364
JournalMaterials Letters
Volume302
DOIs
StatePublished - 1 Nov 2021

Keywords

  • Defects
  • Microstructure
  • Nanocrystalline materials
  • Phase transformation
  • X-ray techniques

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