Grain boundary engineering for improving stress corrosion cracking of 304 stainless steel

Tingguang Liu, Qin Bai, Xiangkun Ru, Shuang Xia, Xiangyu Zhong, Yonghao Lu, Tetsuo Shoji

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Grain boundary engineering (GBE) via low strain tension and annealing was used to enhance the resistance to stress corrosion cracking of a 304 stainless steel. Electron backscattered diffraction (EBSD) analysis exhibited that the GBE steel had a higher fraction of low-∑ coincidence site lattice (CSL) boundaries, larger grain-clusters, longer twin boundary chains, and fewer paths of connected non-twin boundaries with a more zigzag shape. Slow strain rate tests in high-temperature water showed that the GBE steel performed better plasticity, higher tensile strength, and similar yield strength compared to conventional steel. The low fraction of random boundaries in GBE steel resulted in a lower frequency of intergranular crack initiation, and the zigzag paths of non-twin boundaries made the intergranular crack propagation more difficult.

Original languageEnglish
Pages (from-to)477-487
Number of pages11
JournalMaterials Science and Technology (United Kingdom)
Volume35
Issue number4
DOIs
Publication statusPublished - 2019 Mar 4

Keywords

  • Stainless steel
  • grain boundary engineering
  • slow strain rate testing
  • stress corrosion cracking
  • twin boundary

ASJC Scopus subject areas

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

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