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本文主要借助于扫描电镜和能谱仪等分析方法探讨了GCr15SiMn钢热轧开坯后出现严重的鱼鳞状表面裂纹缺陷的原因。结果表明:产生其表裂缺陷是由于钢中存在大量的铅、锡等低熔点元素偏聚在晶界处及夹杂中,造成钢加工热脆现象发生所致。具有上述热脆缺陷的钢室温断裂机制为沿晶脆断,其断口中各沿晶面上大体可根据主要偏聚锡元素和铅元素的不同分别形成片层状和网状微细结构形态。
In this paper, the causes of serious flaws of fish scale surface cracks after hot rolling of GCr15SiMn steel were discussed by means of SEM and EDS. The results show that the surface crack is caused by the presence of a large amount of low melting point elements such as lead and tin in the grain segregated at the grain boundaries and inclusions, resulting in the occurrence of hot brittleness. The room temperature rupture mechanism of the steel with the above hot brittleness defects is along the grain brittle fracture, and the fractured surfaces along the crystal planes of the fractured steel generally form lamellar and reticular fine structure forms respectively according to the difference of the main segregation tin element and the lead element.