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。
The carbonide in the recarburized layer is mainly M23C6. The martensitic zone is composed of dislocation martensite, twinning martensite, residual austenite and a little carbonide.
增碳层中的碳化物主要为M_（23）C_6。马氏体带由位错马氏体、孪晶马氏体、残余奥氏体和少量碳化物组成；
The experimental result shows that the cracking resistance can be increased effectively as dual-phase structure existed in the layer consisting of lower bainite and lath martensite.
试验证明，当焊缝组织为下贝氏体及板条马氏体双相组织时，能有效地提高焊条的抗裂性能。
Rapid cooling after nitrocarburizing, martensite structure is obtained at the diffusion layer.
氮碳共渗后快冷，在渗层获得含氮碳的马氏体组织。
In past literature, based on the layer's hardness close to martensite's, the layer was considered martensite from abnormal temperature rise on the surface.
在以往的文献记载中，常根据其硬度接近马氏体，将其归结为拉拔过程中表面异常升温而产生的马氏体。
In past literature, based on the layer's hardness close to martensite's, the layer was considered martensite from abnormal temperature rise on the surface.
在以往的文献记载中，常根据其硬度接近马氏体，将其归结为拉拔过程中表面异常升温而产生的马氏体。
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