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为了探讨用电磁搅抨防止晶界裂纹的适用性,浇铸了有60mm、90mm、120mm 断面的阶梯形9%Ni 铸钢件。对宏观组织和微观组织进行了观察,对铸态试样做了机械性能检测。未进行电磁搅拌的材料呈粗大柱状树枝晶组织,而进行了电磁搅拌的材料,其每个断面占壁厚40%左右是等轴晶和二次枝晶组织。无搅拌试块没有韧性,而且其拉伸强度随铸件厚度的增加而减少。但是,带搅拌的试块,其拉伸强度是稳定的,同厚度没有关系,而且有相当好的韧性。因此,可以认为,电磁搅拌对防止9%Ni 钢铸件的晶界裂纹是有效的。
In order to investigate the applicability of electromagnetic stirring to prevent grain boundary cracking, a stepped 9% Ni cast steel with 60 mm, 90 mm, 120 mm sections was cast. The macro-organizations and microstructures were observed, and the mechanical properties of as-cast samples were tested. Materials without electromagnetic stirring were coarse columnar dendrites, and electromagnetic stirring materials, each of which accounts for about 40% of the wall thickness is equiaxed and secondary dendritic structure. No stirring test piece is not toughness, and its tensile strength decreases with increasing casting thickness. However, with the stirring test piece, its tensile strength is stable, has no relationship with the thickness, and has a very good toughness. Therefore, it is considered that electromagnetic stirring is effective in preventing grain boundary cracking of 9% Ni steel castings.