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Materials 2017, 10(9), 1084; doi:10.3390/ma10091084

Multiple Fatigue Failure Behaviors and Long-Life Prediction Approach of Carburized Cr-Ni Steel with Variable Stress Ratio

1
School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
2
College of Mechanical Engineering, Inner Mongulia University of Technology, Hohhot 010051, China
3
College of Science and Engineering, Ritsumeikan University, Kusatsu 5258577, Japan
*
Author to whom correspondence should be addressed.
Received: 23 August 2017 / Revised: 7 September 2017 / Accepted: 11 September 2017 / Published: 14 September 2017
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Abstract

Axial loading tests with stress ratios R of −1, 0 and 0.3 were performed to examine the fatigue failure behavior of a carburized Cr-Ni steel in the long-life regime from 104 to 108 cycles. Results show that this steel represents continuously descending S-N characteristics with interior inclusion-induced failure under R = −1, whereas it shows duplex S-N characteristics with surface defect-induced failure and interior inclusion-induced failure under R = 0 and 0.3. The increasing tension eliminates the effect of compressive residual stress and promotes crack initiation from the surface or interior defects in the carburized layer. The FGA (fine granular area) formation greatly depends on the number of loading cycles, but can be inhibited by decreasing the compressive stress. Based on the evaluation of the stress intensity factor at the crack tip, the surface and interior failures in the short life regime can be characterized by the crack growth process, while the interior failure with the FGA in the long life regime can be characterized by the crack initiation process. In view of the good agreement between predicted and experimental results, the proposed approach can be well utilized to predict fatigue lives associated with interior inclusion-FGA-fisheye induced failure, interior inclusion-fisheye induced failure, and surface defect induced failure. View Full-Text
Keywords: carburized steel; stress ratio; interior failure; initiation and growth; life prediction carburized steel; stress ratio; interior failure; initiation and growth; life prediction
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Deng, H.; Li, W.; Zhao, H.; Sakai, T. Multiple Fatigue Failure Behaviors and Long-Life Prediction Approach of Carburized Cr-Ni Steel with Variable Stress Ratio. Materials 2017, 10, 1084.

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