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Metals 2017, 7(7), 254; doi:10.3390/met7070254

On the Short Surface Fatigue Crack Growth Behavior in a Fine-Grained WC-Co Cemented Carbide

1
Machinery and Engineering Group, YKK Corporation, 200 Yoshida, Kurobe, Toyama 938-8601, Japan
2
National Institute of Technology, Toyama College, 13 Hongo, Toyama 939-8630, Japan
3
Faculty of Engineering, University of Toyama, 3190 Gofuku, Toyama 930-8555, Japan
*
Author to whom correspondence should be addressed.
Received: 28 May 2017 / Revised: 28 June 2017 / Accepted: 3 July 2017 / Published: 6 July 2017
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Abstract

In the present study, the fatigue crack growth (FCG) behavior of short surface cracks in a fine-grained cemented carbide with a length of less than 1 mm was investigated. The rotating bending and the four-point bending fatigue tests were carried out at stress ratios of R = −1 and R = 0.1 (R = maximum stress/minimum stress). It was found that a short surface crack had a longer stable fatigue crack growth area than a long through-thickness crack; the FCG behaviors of the two types of crack are clearly different. Furthermore, the FCG path of short surface cracks was investigated in detail to study the interaction between fatigue cracks and microstructures of the cemented carbide such as WC grains and the Co phase. At a low Kmax (Kmax = the maximum stress intensity factor), it was found that fatigue crack growth within WC grains is difficult because of a small driving force; instead, crack growth is along the brittle WC/WC interface. On the other hand, at a high Kmax, WC grain breakage often occurs, since the driving force of FCG is large, and the fatigue crack grows linearly. View Full-Text
Keywords: WC-Co cemented carbide; short surface fatigue crack; long through-thickness fatigue crack; fatigue crack growth (FCG); crack growth path; stress intensity factor (SIF) WC-Co cemented carbide; short surface fatigue crack; long through-thickness fatigue crack; fatigue crack growth (FCG); crack growth path; stress intensity factor (SIF)
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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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MDPI and ACS Style

Mikado, H.; Ishihara, S.; Oguma, N.; Kawamura, S. On the Short Surface Fatigue Crack Growth Behavior in a Fine-Grained WC-Co Cemented Carbide. Metals 2017, 7, 254.

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