The formation mechanism of characteristic region at crack initiation for very-high-cycle fatigue of high-strength steels

By Youshi Hong, Xiaolong Liu, Zhengqiang Lei, Chengqi Sun. 2016

266 citations recorded by the source corpus.

Abstract For high-strength steels, the crack initiation of very-high-cycle fatigue (VHCF) is commonly at the interior of material with fish-eye (FiE) morphology containing a fine-granular-area (FGA) surrounding an inclusion as crack origin, and FGA is regarded as the characteristic region of crack initiation. Here, we carefully examined the micro-morphology of FGA and FiE for two high-strength steels. The results revealed that the microscopic nature of FGA is a thin layer of nanograins. Then we proposed the formation mechanism of FGA: Numerous Cyclic Pressing (NCP) between originated crack surfaces, which causes grain refinement at originated crack wake and therefore the formation of FGA. The results of second set experiment showed that the cases with negative stress ratios exhibit the prevalence of nanograin layer in FGA region and the nanograin layer vanishes for the cases with positive stress ratios, which is a verification of the proposed NCP model.

Subfields: Materials Chemistry, Mechanical Engineering, Mechanics of Materials

View Paper: https://www.semanticscholar.org/paper/115b6bea46a25e5c2d784c4ef9065078d4d8c881

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In Materials Chemistry

  1. W. Lei
  2. G. Qian
  3. Chengqi Sun
  4. Youshi Hong

In Mechanical Engineering

  1. Chengqi Sun
  2. Youshi Hong
  3. W. Lei
  4. G. Qian

In Mechanics of Materials

  1. Chengqi Sun
  2. Youshi Hong
  3. W. Lei
  4. G. Qian

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