In-situ observation on twin boundary evolution and crack initiation behavior during tensile test on 316L austenitic stainless steel

Wei Wang, Tingguang Liu, Xinyuan Cao, Yonghao Lu, Tetsuo Shoji

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

This paper reports an in-situ observation on the twin boundary evolution and crack initiation behavior during the tensile test in 316L stainless steel by means of the electron backscattered diffraction (EBSD) method. The results indicated that the percentage of the twin boundaries gradually reduced with increasing elongation and the crack initiated at the twin boundary after a definite elongation. The difference in Schmid factor value between two grains besides twin boundaries continuously increased with increase of elongation, which led to movement of the dislocations within grains to twin boundaries. High density of the dislocations led to a larger local misorientation value difference between two sides of the twin boundaries, which indicated that those twin boundaries accumulated more strains during the tensile. As a result, the twin lost their coincidence site lattice with austenite grains, and twin boundaries transformed to random high angle ones, and the finally led to initiation of the crack at the high angle boundary where the twin boundary transformed.

Original languageEnglish
Pages (from-to)169-174
Number of pages6
JournalMaterials Characterization
Volume132
DOIs
Publication statusPublished - 2017 Oct

Keywords

  • Electron back-scatter diffraction
  • In-situ tensile test
  • Schmid factor
  • Slip system
  • Twin boundary

ASJC Scopus subject areas

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

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