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Interior crack initiation and growth behaviors and life prediction of a carburized gear steel under high cycle fatigue and very high cycle fatigue

Published online by Cambridge University Press:  27 July 2015

Wei Li ,
Zhenduo Sun ,
Hailong Deng ,
Zhenyu Zhang  and
Tatsuo Sakai
Wei Li*
Affiliation:
School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
Zhenduo Sun
Affiliation:
School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
Hailong Deng
Affiliation:
School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
Zhenyu Zhang
Affiliation:
School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
Tatsuo Sakai
Affiliation:
College of Mechanical Engineering, Ritsumeikan University, Kusatsu 5258577, Japan
*
a)Address all correspondence to this author. e-mail: lliw@bit.edu.cn
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Abstract

The axial loading test was performed to investigate the effect of carburizing on crack initiation and growth behaviors of a gear steel under high cycle fatigue (HCF) and very high cycle fatigue (VHCF). As a result, the carburized gear steel exhibits the duplex S–N characteristics associated with different interior failure mechanisms. The failure process in the HCF regime can be described as inclusion → fisheye → final crack growth zone (FCGZ) → momentary fracture zone (MFZ), whereas that in the VHCF regime is described as inclusion → fine granular area (FGA) → fisheye → FCGZ → MFZ. Based on the definition of crack sizes at different transition stages and the evaluation of stress intensity factor, the models for predicting crack initiation and growth lives in the HCF regime and in the VHCF regime were established. The predicted crack initiation life tends to increase with the decrease of stress amplitude. In the VHCF regime, the crack initiation life associated with the FGA size is almost equivalent to the total fatigue life, whereas the crack growth life only occupies a tiny fraction. In view of the good agreement between the predicted and experimental results, the theoretical modeling method based on crack initiation and growth can be well used to predict the fatigue life of carburized steel with the interior inclusion-induced failure in the HCF regime and in the VHCF regime.

Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 14 , 28 July 2015 , pp. 2247 - 2257
Copyright
Copyright © Materials Research Society 2015 

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References

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