Characterization of hydrogen-induced contact fracture in high-strength steel

Akio YONEZU, Michihiro NIWA, Xi CHEN

Research output: Journal PublicationsJournal Article (refereed)peer-review

2 Citations (Scopus)

Abstract

This study investigated the hydrogen embrittlement (HE) cracking behavior produced by local contact loading of high-strength steel. When a spherical impression was applied to a hydrogen-absorbed high-strength steel, HE induces contact fracture, where radial cracks are initiated and propagated from the indentation impression. The length of the radial crack was found to be dependent on the hydrogen content in the steel as well as the applied contact force. A combined experimental/computational investigation was conducted in order to clarify the mechanism of hydrogen-induced contact fracture. In the computation, crack propagation was simulated using a cohesive zone model (CZM) in finite element method (FEM), in order to elucidate stress criterion of the present HE crack. It was found that the normal tensile stress was developed around impression, and it initiated and propagated the HE crack. It was also revealed that the hydrogen content enhanced contact fracture damage, especially the resistance of crack propagation (i.e., threshold stress intensity factor, Kth). The findings may be useful for countermeasure of contact fracture coupled with hydrogen in high-strength steel. Such phenomenon is potentially experienced in various contact components in hydrogen environment. Copyright © 2015 by ASME.
Original languageEnglish
Article number21007
Volume137
Issue number2
DOIs
Publication statusE-pub ahead of print - 1 Apr 2015
Externally publishedYes

Bibliographical note

The work of A.Y. was supported in part of by JSPS KAKENHI (Grant No. 22760077) from the Japan Society for the Promotion of Science (JSPS) and Research Grant for Science and Technology of SUZUKI Foundation. The work of X.C. was supported by the National Natural Science Foundation of China (11172231), DARPA (W91CRB-11-C-0112), and the National Science Foundation (CMMI-0643726).

Keywords

  • Contact loading
  • High-strength steel
  • Hydrogen embrittlement cracking
  • Spherical indentation test

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