An investigation on high temperature fatigue properties of tempered nuclear-grade deposited weld metals

X. Y. Cao, P. Zhu, Q. Yong, T. G. Liu, Y. H. Lu, J. C. Zhao, Y. Jiang, T. Shoji

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Effect of tempering on low cycle fatigue (LCF) behaviors of nuclear-grade deposited weld metal was investigated, and The LCF tests were performed at 350 °C with strain amplitudes ranging from 0.2% to 0.6%. The results showed that at a low strain amplitude, deposited weld metal tempered for 1 h had a high fatigue resistance due to high yield strength, while at a high strain amplitude, the one tempered for 24 h had a superior fatigue resistance due to high ductility. Deposited weld metal tempered for 1 h exhibited cyclic hardening at the tested strain amplitudes. Deposited weld metal tempered for 24 h exhibited cyclic hardening at a low strain amplitude but cyclic softening at a high strain amplitude. Existence and decomposition of martensite-austenite (M-A) islands as well as dislocations activities contributed to fatigue property discrepancy among the two tempered deposited weld metal.

Original languageEnglish
Pages (from-to)317-325
Number of pages9
JournalJournal of Nuclear Materials
Volume499
DOIs
Publication statusPublished - 2018 Feb

Keywords

  • Deposited weld metal
  • High temperature
  • Low cycle fatigue
  • Tempering

ASJC Scopus subject areas

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

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