The supercooled austenite transforms into friable martensite layer during the following rapid cooling process, leading to cracking and spalling at wheel tread.
过冷奥氏体高速冷却，几乎全部形成脆硬的马氏体薄层，造成踏面剥离。
It was found that with the increasing of carbon content, the martensite layer the weld bond disappeared, and the sawtooth-like of the partially melted zone widened.
结果发现随碳含量增加，熔合区中的类马氏体层消失，呈锯齿状的部分熔合区增宽。
The structure of adhesive phase and transition layer in bright layers are mixed type of martensite.
白亮层中的粘结相以及过渡层的组织均为混合的马氏体组织。
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