Effects of phosphorus segregation on stress corrosion cracking in the heat-affected zone of a dissimilar weld joint between a Ni-base alloy and a low alloy steel

Ziqing Zhai, Hiroshi Abe, Yuichi Miyahara, Yutaka Watanabe

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Effects of phosphorus segregation on stress corrosion cracking (SCC) in the heat-affected zone of an Alloy 182-A533B dissimilar weld joint in high-temperature, oxygenated water doped with SO42- and Cl- were evaluated by creviced bent beam test. Results indicate that step cooling and the addition of Cl- promoted SCC propagation and reactivation in the HAZ after cracks reach the fusion boundary. It is also suggested that phosphorus segregation at grain/packet boundaries and precipitate-matrix interfaces have promoted SCC, especially in coarse-grained HAZ and intercritically reheated coarse-grained HAZ.

Original languageEnglish
Pages (from-to)32-42
Number of pages11
JournalCorrosion Science
Volume92
DOIs
Publication statusPublished - 2015 Mar 1

Keywords

  • A. Low alloy steel
  • Atom probe tomography
  • B. AFM
  • C. Segregation
  • C. Stress corrosion

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Science(all)

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