XDC04010600-M50钢轧制变形优化基体及一次碳化物工艺技术文件

将 M50 钢铸锭经真空感应+真空自耗进行冶炼后，铸造组织经过锻造方法热加工变形后由于金属的变形和再结晶，使原来的粗大枝晶和柱状晶粒变为晶粒较细、大小均匀的等轴
再结晶组织，使钢锭内原有的偏析、疏松、气孔、夹渣等压实和焊合，其组织变得更加紧密，提高了金属的塑性。将锻后的棒材，准备轧坯，轧坯要求上下面平整，表面应无裂缝，折叠，拉裂和夹杂等缺陷；轧坯端面不得有缩孔，尾孔和分层。

Following the smelting of M50 steel ingots via vacuum induction melting coupled with vacuum consumable electrode remelting, the as-cast microstructure undergoes hot working deformation through forging. Driven by metal deformation and recrystallization, the original coarse dendrites and columnar grains are transformed into fine, uniformly sized equiaxed recrystallized microstructures. Additionally, the pre-existing defects such as segregation, microporosity, gas pores and inclusions within the steel ingot are compacted and welded together, rendering the microstructure more compact and enhancing the metal's plasticity. The forged bars are then prepared for billet rolling, which mandates that the top and bottom surfaces be flat, with no defects including cracks, folds, tearing or inclusions on the surface; the end faces of the billets must be free of shrinkage cavities, tail holes and delaminations.