气缸盖开裂的主要原因是过高的热应力所引起的热疲劳破坏。材料的抗热疲劳能力与热应力的大小及抗热应力的能力有关。前者与导热系数的大小相关, 后者与材料的高温强度有关。通过对蠕墨铸铁材料的机械、物理和铸造等性能的测试分析,并经柴油机热冲击试验,认为该材料可以作为气缸盖的一种新型材料。 The main reason for cylinder head cracking is thermal fatigue damage caused by excessive thermal stress. Thermal fatigue resistance of materials and thermal stress on the size and ability to resist thermal stress. The former is related to the thermal conductivity, which is related to the high temperature strength of the material. By analyzing the mechanical, physical and casting properties of vermicular graphite cast iron, and through the thermal shock test of diesel engine, the material can be considered as a new material of cylinder head.