Intergranular fatigue crack initiation and its associated small fatigue crack propagation in water-quenched fe-c fully ferritic steel

Motomichi Koyama, Zhou Jia Xi, Yuichi Yoshida, Nobuyuki Yoshimura, Kohsaku Ushioda, Hiroshi Noguchi

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The fatigue crack initiation and propagation behavior of a water-quenched binary Fe-C fully ferritic steel was investigated though rotating-bending fatigue testing. Intergranular and transgranular crack initiation and propagation were observed. The intergranular crack propagation did not stop, while the transgranular crack propagation was retarded by crack closure and strain aging. As a result, intergranular cracking was the dominant cause of fatigue damage in the steel. A considerable number of cracks were initiated; these propagated through coalescence, which occurred mainly at the grain boundaries. Dominancy of the intergranular fatigue crack propagation increased with increasing stress amplitude. In addition, the steel showed coaxing effect significantly. The coaxing effect suppresses crack initiation as well as crack propagation.

Original languageEnglish
Pages (from-to)268-273
Number of pages6
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Volume102
Issue number5
DOIs
Publication statusPublished - 2016

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry

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