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研究了缺口角度对YG8硬质合金热冲击疲劳的影响。结果表明，缺口角度对裂纹的特性有很大影响，以缺口角度的增加，裂纹萌生的孕育期缩短，裂纹扩展速率增加．随冷却速率的增加，裂纹萌生的孕育期也缩短，且裂纹扩展速率增加．观察发现，热冲击疲劳断口中存在疲劳条纹．
The effect of notch angle on thermal shock fatigue of YG8 cemented carbide was studied. The results show that the notch angle has a great influence on the crack characteristics. With the increase of notch angle, the initiation period of crack initiation is shortened and the crack propagation rate is increased. With the increase of cooling rate, the initiation period of crack initiation also shortened, and the crack propagation rate increased. It was observed that there was fatigue streaks in the thermal shock fatigue fracture.