The effect of artificial defects on the fatigue characteristics of AISI 4340 steel

Yaakov B. Unigovski, Dmitry Fishman, Liat Fishman, Liron Shichman, Ofir Moshe, Roni Z. Shneck, Emmanuel M. Gutman

Research output: Contribution to journalArticlepeer-review

Abstract

This study examined the fatigue life (Nf) and fatigue limit (FL) of AISI 4340 steel in relation to surface roughness, artificial defects and shot peening. Artificial surface defects on fatigue specimens were obtained by electrical discharge machining (EDM) or by pre-corrosion in 3.5% NaCl and perchloric acid solutions, followed by a fatigue test. The presence of artificial defects of various sizes, taken into account by the √area parameter, led to a significant decrease in fatigue characteristics, while shot peening contributed to their noticeable improvement. Defects resulting from electrochemical corrosion had a much greater negative effect on fatigue life than defects introduced by EDM.

Original languageEnglish
Pages (from-to)53-62
Number of pages10
JournalJournal of Metals, Materials and Minerals
Volume31
Issue number3
DOIs
StatePublished - 1 Jan 2021

Keywords

  • Artificial defects
  • High cyclic fatigue
  • Low alloy steel
  • Shot peening
  • Surface roughness

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