座表面;
The results showed that capillary crack was formed from the surface cavity of billet in the process of high temperature heating-rolling and cavity and sliver defects were formed due to part melting of seating face of heavy rail.
分析结果表明:发纹缺陷是由方坯表面气孔经高温加热-轧制演变成的,掉肉和小裂口则是因重轨踏面局部融熔所造成的。
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