热变形白口铸铁的热疲劳行为与碳化物的作用

Study on The Thermal Fatigue Behavior of Hot Deformed White Cast Iron and Effect of Carbide

本文对不同变形量白口铸铁的热疲劳行为进行了探讨。结果表明 ,共晶碳化物是热疲劳裂纹产生及扩展的主要部位和通道 ,碳化物破碎越严重 ,其热疲劳抗力越高 ,热疲劳断口主要为解理断口。

The thermal fatigue behavior of white cast iron with different quantity of deformation has been investigated in the paper. The results show that eutectic carbide is the main location and passage for initiation and extension of thermal fatigue crack, approving that the more serious the carbide breaks, the higher thermal fatigue resistance of the white cast iron will be and the thermal fatigue fracture belongs mainly in cleavage fracture.