Mechanisms of fatigue crack growth in WC-Co cemented carbides

被引：2
|
作者：
Boo, MH [1 ]
Park, CY [1 ]
机构：
[1] KEPRI, Nucl Mech & Mat Grp, Taejon, South Korea
来源：
ADVANCES IN FRACTURE AND STRENGTH, PTS 1- 4 | 2005年 / 297-300卷
关键词：
fatigue crack growth; WC-Co; cemented carbides; stress intensity factor; stress ratio; mean free path; phase transformation;
D O I：
10.4028/www.scientific.net/KEM.297-300.1120
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
In order to study the influence of stress ratio and WC grain size, the characteristics of fatigue crack growth were investigated in WC-Co cemented carbides with two different grain sizes of 3 and 6 mu m. Fatigue crack growth tests were carried out over a wide range of fatigue crack growth rates covering the threshold stress intensity factor range AK(th). It was found that crack growth rate da/dN against stress intensity factor range Delta K depended on stress ratio R. The crack growth rate plotted in terms of effective stress intensity factor range Delta K-eff still exhibited the effect of microstructure. Fractographic examination revealed brittle fracture at R=0.1 and ductile fracture at R=0.5 in Co binder phase. The amount of Co phase transformation for stress ratio was closely related to fatigue crack growth characteristics.
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页码：1120 / 1125
页数：6
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