Cyclic strain hardening of polygonal and acicular ferrite/bainite microstructures in microalloyed steels in the temperature range - 150°C to 27°C

J. P. Lucas, W. W. Gerberich

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

Cyclic strain hardening has been observed to be markedly sensitive to microstructural changes in microalloyed steels. Two significantly different microstructures - polygonal ferrite grains of average grain size 10-120 μm and acicular ferrite/upper bainite colonies of dimensions 200-625 μm - were examined in order to determine the influence of each on cyclic strain hardening and related properties. Tests were conducted at temperatures between -150 and 27°C. The cyclic strain hardening exponent, βc, was significantly more sensitive to changes in the size of the polygonal ferrite grains than to changes in the acicular ferrite/upper bainite colony size.

Original languageEnglish (US)
Pages (from-to)31-38
Number of pages8
JournalInternational Journal of Fatigue
Volume7
Issue number1
DOIs
StatePublished - Jan 1985

Bibliographical note

Funding Information:
This work was performed at the Sandia National Laboratories supported by the US Department of Energy under contract number DE-AC04-76DPO0789. Partial financial support was further provided under grant number DOE-DE AC02-79ER10433, also from the Department of Energy.

Keywords

  • cyclic hardening
  • grain size
  • low cycle fatigue
  • low temperatures
  • microalloyed steels
  • microstructure

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