Effect of strengthening mechanism on fatigue properties of hot-rolled sheet steels

Tatsuo Yokoi, Manabu Takahashi, Norio Ikenaga

Research output: Contribution to journalConference articlepeer-review

Abstract

The influence of tensile strength on fatigue strength and the effect of strengthening mechanism on fatigue notch factor were investigated into conventional mild steels, HSLA steels, DP steels and TRIP steels. The grade of studied steels was altered from 440MPa to 780MPa. Not only smooth fatigue specimens with side surface ground and smooth fatigue specimens with laser-cut side surface but also fatigue specimens with a pierced hole were prepared for each of steel sheets. Fatigue tests were conducted in an axial load method. These experiments made it clear that the fatigue limits of smooth specimen increase along the tensile strength approximately independent of strengthening mechanism but those of notched specimen do not necessarily increase along the tensile strength. Namely, fatigue limits of DP steels and TRIP steels with notch increase in proportion to tensile strength although those of HSLA steels with notch do not increase. Laser cut makes the side surface of specimen very rough compared to mechanical cut hereby fatigue limits of these steels decrease.

Original languageEnglish
JournalSAE Technical Papers
DOIs
Publication statusPublished - 2002
Externally publishedYes
EventSAE 2002 World Congress - Detroit, MI, United States
Duration: Mar 4 2002Mar 7 2002

All Science Journal Classification (ASJC) codes

  • Automotive Engineering
  • Safety, Risk, Reliability and Quality
  • Pollution
  • Industrial and Manufacturing Engineering

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