Grain size effect in the low cycle fatigue of a steel under mean strain

Jun Komotori, Masao Shimizu

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Low cycle fatigue tests and small crack propagation tests were conducted on two kinds of annealed low carbon steel having fine and coarse grained microstructures with a special interest in the influence of grain refinement and mean strain on the low cycle fatigue life and on the fracture mode transition. Results show that (i) a difference in the fatigue lives for the fine and coarse grained steels under mean strain εm=0 is caused by a difference in a crack initiation life for both materials, (ii) a surface to internal fracture mode transition occurs easily with an increase in mean strain and grain size and, (iii) the fatigue life of the specimen failed in the surface fracture mode at a small plastic strain is not primarily controlled by the exhaustion of ductility.

Original languageEnglish
Pages (from-to)401-406
Number of pages6
JournalNippon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
Volume55
Issue number511
Publication statusPublished - 1989 Mar
Externally publishedYes

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Steel
Fatigue of materials
Grain refinement
Low carbon steel
Crack initiation
Ductility
Crack propagation
Plastic deformation
Microstructure

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

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AB - Low cycle fatigue tests and small crack propagation tests were conducted on two kinds of annealed low carbon steel having fine and coarse grained microstructures with a special interest in the influence of grain refinement and mean strain on the low cycle fatigue life and on the fracture mode transition. Results show that (i) a difference in the fatigue lives for the fine and coarse grained steels under mean strain εm=0 is caused by a difference in a crack initiation life for both materials, (ii) a surface to internal fracture mode transition occurs easily with an increase in mean strain and grain size and, (iii) the fatigue life of the specimen failed in the surface fracture mode at a small plastic strain is not primarily controlled by the exhaustion of ductility.

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