研究了车轮铸钢在不同温度幅下热疲劳损伤表面及次表层行为．研究发现，表面氧化及剥落现象和氧化物的开裂随循环上限温度的增高而愈加严重；次表层损伤以裂纹为主，附带一些蚀坑．其损伤机理是由于氧化脱碳使铁素体区形成腐蚀坑，腐蚀坑的连接形成微裂纹，热疲劳主裂纹优先通过铁素体区氧化腐蚀坑而向前扩展． The surface and subsurface behavior of wheel cast steel under different temperature amplitude and thermal fatigue damage were studied. It is found that the surface oxidation and spalling phenomena and the cracking of oxide are more and more serious with the increase of the upper temperature of the cycle. The subsurface damage is mainly cracked with some pits. The damage mechanism is due to the oxidation decarburization ferrite zone corrosion pits, corrosion pits to form micro-cracks, the main thermal fatigue cracks preferentially through the ferrite oxidation corrosion pits and the forward expansion.