Effect of electron beam surface hardening on fatigue crack growth rate in AISI 4340 steel

Jiun Ren Hwang, Chin Ping Fung

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

This paper studies the effect of electron beam (EB) surface hardening on the fatigue crack growth rate in AISI 4340 steel. The heat treatment conditions were varied to consider the influence of microstructure and residual stress. The results show that increasing the EB heat input increases the compressive residual stress in the hardened layer. Thus EB surface-hardening treatment improves the fatigue crack growth resistance. This effect increases with increasing EB heat input but disappears as the ΔK value increases. The fracture mechanism of the hardened layer is intergranular fracture, while that of the base material is transgranular quasi-cleavage.

Original languageEnglish
Pages (from-to)271-278
Number of pages8
JournalSurface and Coatings Technology
Volume80
Issue number3
DOIs
StatePublished - Apr 1996

Keywords

  • AISI 4340 steel
  • Electron beam
  • Fatigue crack growth
  • Surface hardening

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