Three-dimensional study of grain boundary engineering effects on intergranular stress corrosion cracking of 316 stainless steel in high temperature water

Tingguang Liu, Shuang Xia, Qin Bai, Bangxin Zhou, Lefu Zhang, Yonghao Lu, Tetsuo Shoji

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

The intergranular cracks and grain boundary (GB) network of a GB-engineered 316 stainless steel after stress corrosion cracking (SCC) test in high temperature high pressure water of reactor environment were investigated by two-dimensional and three-dimensional (3D) characterization in order to expose the mechanism that GB-engineering mitigates intergranular SCC. The 3D microstructure shown that the essential characteristic of the GB-engineered microstructure is formation of many large twin-boundaries as a result of multiple-twinning, which results in the formation of large grain-clusters. The large grain-clusters played a key role to the improvement of intergranular SCC resistance by GB-engineering. The main intergranular cracks propagated in a zigzag along the outer boundaries of these large grain-clusters because all inner boundaries of the grain-clusters were twin-boundaries (∑3) or twin-related boundaries (∑3n) which had much lower susceptibility to SCC than random boundaries. These large grain-clusters had tree-ring-shaped topology structure and very complex morphology. They got tangled so that difficult to be separated during SCC, resulting in some large crack-bridges retained in the crack surface.

Original languageEnglish
Pages (from-to)290-299
Number of pages10
JournalJournal of Nuclear Materials
Volume498
DOIs
Publication statusPublished - 2018 Jan

Keywords

  • 316 stainless steel
  • 3D characterization
  • Grain boundary engineering
  • Grain-cluster
  • Intergranular stress corrosion cracking

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Nuclear Energy and Engineering

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