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确定了车轮铸钢循环温度范围与循环次数间幂指数关系。其热疲劳损伤有两种主要形式；在低循环上限温度，表面氧化轻微，形成少量表面氧化腐蚀坑；在高循环上限温度，表面氧化严重，厚氧化膜剥落，大量的氧化腐蚀坑及微裂纹形成，并连接成细长主裂纹。表面氧化对热疲劳裂纹扩展有重要作用。
The relationship between the power cycle index and the cycle temperature range of the wheel steel was determined. There are two main forms of thermal fatigue damage. At the upper limit of low cycle temperature, the surface is slightly oxidized to form a small amount of surface oxide corrosion pits. At the high cycle upper temperature, the surface is oxidized severely, the thick oxide film is peeled off, a large number of oxidative corrosion pits and microcracks Formed, and connected into a slender main crack. Surface oxidation plays an important role in thermal fatigue crack propagation.