Fatigue crack growth behavior in ultrafine grained low carbon steel

被引：0
|
作者：
Ho-Kyung Kim
Myung-Il Choi
Chin-Sung Chung
Dong-Hyuk Shin
机构：
[1] Seoul National University of Technology,Department, of A utomotive Engineering
[2] Science & Technology Research Institute of Hong-Ik University,Deparment. of Metallurgy and Materials Science
[3] Hanyang University,undefined
来源：
KSME International Journal | 2002年 / 16卷
关键词：
Ultrafine Grained Materials; Fatigue Crack Growth; Crack Closure Effective Stress Intensity Range;
D O I：
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中图分类号：
学科分类号：
摘要：
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.
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页码：1246 / 1252
页数：6
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