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首页> 外文期刊>Сверхтвердые　материалы. >Investigation on the static fatigue mechanism and effect of specimen thickness on the static fatigue lifetime in WC-Co cemented carbides
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Investigation on the static fatigue mechanism and effect of specimen thickness on the static fatigue lifetime in WC-Co cemented carbides

机译：试样厚度静疲劳机理及效果对WC-Co水泥碳化物静态疲劳寿命的研究

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摘要

The static fatigue mechanism and effect of specimen thickness on static fatigue lifetime for four WC-Co cemented carbides were studied with different binder contents and carbide grain sizes. Static fatigue tests under three-point bend loading were conducted on different sized specimens. The fracture surfaces of rupture specimens were examined by scanning electron microscopy to investigate the static fatigue micromechanisms. Experimental results show that microcracks nucleate from defects or inhomogeneities and the connection of microcracks produces a main crack The main crack propagates rapidly, resulting in the fracture of specimens. The extension of static fatigue lifetime with the increase of specimen thickness is due to the decrease of plastic zone size near the crack tip and relevant energy change during the crack growth. The effect of specimen thickness on static fatigue lifetime is much greater for cemented carbides with larger JVC grain size or higher cobalt content, which is attributed to operative toughening mechanisms.
机译：用不同的粘合剂含量和碳化物晶粒尺寸研究了四种WC-Co硬质合金静态疲劳寿命的静疲劳机理和效果。在不同尺寸的标本上进行三点弯装载下的静态疲劳试验。通过扫描电子显微镜检查破裂标本的断裂表面，以研究静态疲劳微机械。实验结果表明，微裂纹从缺陷或不均匀性成核，微裂纹的连接产生主要裂纹，主要裂纹迅速传播，导致样本的骨折。随着试样厚度的增加，静疲劳寿命的延伸是由于塑料区尺寸附近裂纹尖端的尺寸和裂纹生长期间的相关能量变化。对于具有较大JVC晶粒尺寸或更高的钴含量的粘合的碳化物，样品厚度对静态疲劳寿命的影响大大更大，这归因于操作增韧机制。

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