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KSME International Journal

, Volume 16, Issue 10, pp 1246–1252 | Cite as

Fatigue crack growth behavior in ultrafine grained low carbon steel

  • Ho-Kyung Kim
  • Myung-Il Choi
  • Chin-Sung Chung
  • Dong-Hyuk Shin
Article

Abstract

Ultrafine grained (UFG) low carbon (0.15 wt.% C) steel produced by equal channel angular pressing (ECAP) was tested for investigating the effect of load ratio on the fatigue crack growth rate. Fatigue crack growth resistance and threshold of UFG steel were lower than that of as-received coarse grained steel. It was attributed to the less tortuous crack path. The UFG steel exhibited slightly higher crack growth rates and a lower ΔKth with an increase of R ratio. The R ratio effect on crack growth rates and ΔKth was basically indistinguishable at lower load ratio (R>0.3), compared to other alloys, which indicates that contribution of the crack closure vanishes. The crack growth rate curve for UFG steel exhibited a longer linear extension to the lower growth rate regime than that for the coarse grained as-received steel.

Key Words

Ultrafine Grained Materials Fatigue Crack Growth Crack Closure Effective Stress Intensity Range 

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Copyright information

© The Korean Society of Mechanical Engineers (KSME) 2002

Authors and Affiliations

  • Ho-Kyung Kim
    • 1
  • Myung-Il Choi
    • 1
  • Chin-Sung Chung
    • 2
  • Dong-Hyuk Shin
    • 3
  1. 1.Department, of A utomotive EngineeringSeoul National University of TechnologySeoulKorea
  2. 2.Science & Technology Research Institute of Hong-Ik UniversitySeoulKorea
  3. 3.Deparment. of Metallurgy and Materials ScienceHanyang UniversityKyunggi-DoKorea

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