Cyclic surface deformation behaviour of ZrH2-purified iron: Effects of solute carbon, strain amplitude, strain rate and environment

Won Jong Lee*, M. E. Fine, Yip-Wah Chung

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The surface deformation behaviour in ZrH2-purified interstitial-free iron was studied during fatigue in the push-pull plastic strain control mode under various combinations of plastic strain amplitude (5×10-4, 5×10-3), strain rate (5×10-4, 3× 10-2s-1) and environment (ultrahigh vacuum, oxygen). Comparative tests of vacuum-melted commercially pure iron (CPI) containing 170 p.p.m. C were also conducted to investigate the effect of interstitials. At a plastic strain amplitude of 5×10-4, the environmental effect is clearly exhibited regardless of the strain rate and the presence of interstitials. Fatigue in ultrahigh vacuum produces very fine slip lines not only in interstitial-free iron but also in vacuum-melted CPI. In the presence of oxygen, fatigue produces prominent slip lines, but those developed in CPI are more intense and coarser than those developed in interstitial-free iron. At the higher plastic strain amplitude of 5×10-3, the gaseous environmental effect on the cyclic surface deformation is insignificant. The surface deformation behaviour is discussed in terms of the environmental effect and the basic mechanisms that govern the cyclic plasticity of iron.

Original languageEnglish (US)
Pages (from-to)5793-5798
Number of pages6
JournalJournal of Materials Science
Volume26
Issue number21
DOIs
StatePublished - Nov 1 1991

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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