martensite layer thickness 马氏体层厚度
Martensite In Surface Layer 马氏体表层
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。
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