Effect of fracture mechanism on low-cycle fatigue life of pure iron and low temperature

Desheng Xia, Jun Komotori, Masao Shimizu

Research output: Contribution to journalArticle

Abstract

Low-cycle fatigue tests were performed at -140 °C using commercial-grade pure iron having an average ferrite grain size of 400 μm. The effect of fracture mechanism on fatigue life properties was investigated, especially on the dispersion of fatigue lives in the high plastic strain range (ΔεP) where fracture occurs in an internal fracture mode. Fracture surfaces were observed using a scanning electron microscope. The dispersion of fatigue lives is due mainly to the difference of internal fracture mode. Specimens fractured by intersection of a deformation twin and a grain boundary (T-B type) show longer fatigue lives than those fractured by intersection of deformation twins (T-T type) or a deformation twin and an inclusion (T-I type). The effect of grain size at the internal fracture origination site was also discussed.

Original languageEnglish
Pages (from-to)665-668
Number of pages4
JournalNippon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
Volume63
Issue number608
Publication statusPublished - 1997 Apr
Externally publishedYes

Fingerprint

Iron
Fatigue of materials
Temperature
Ferrite
Plastic deformation
Grain boundaries
Electron microscopes
Scanning

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

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abstract = "Low-cycle fatigue tests were performed at -140 °C using commercial-grade pure iron having an average ferrite grain size of 400 μm. The effect of fracture mechanism on fatigue life properties was investigated, especially on the dispersion of fatigue lives in the high plastic strain range (ΔεP) where fracture occurs in an internal fracture mode. Fracture surfaces were observed using a scanning electron microscope. The dispersion of fatigue lives is due mainly to the difference of internal fracture mode. Specimens fractured by intersection of a deformation twin and a grain boundary (T-B type) show longer fatigue lives than those fractured by intersection of deformation twins (T-T type) or a deformation twin and an inclusion (T-I type). The effect of grain size at the internal fracture origination site was also discussed.",
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