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生产实践试验证明我所研制的CG-2基体钢属超高强度钢种,可以作为冷模和热模材料使用,能满足形状复杂,承受压、弯、冲击等复合应力的模具服役条件。1120℃油淬560℃保温2小时回火二次,基体显微组织为回火马氏体+小块状碳化物+呈串分布颗粒碳化物。冲击断口形貌为晶粒表面为小变形迭波和准解理的沿晶断口+少量的塑性变形带(迭波)+二次裂纹+碳化相物(见照片6)。1120℃油淬630℃保温2小时回火二次,基体显微组织为回火马氏体+回火屈氏体+小块状碳化物+呈串分布颗粒碳化物。冲击断口形貌为晶粒表面为小变形迭波和准解理混合的沿晶断口+部分岩石状断裂+二次裂纹+碳化物相(见照片12)。机械性能1120℃和1080℃时淬火分别在560℃或630℃回火时能获得强度和韧性较好的配合。
The production practice test proves that CG-2 base steel of super high strength steel which I developed can be used as cold mold and hot mold material to meet the service conditions of complex molds with complex stress such as pressure, bending and impact. 1120 ℃ oil quenching 560 ℃ heat 2 hours tempering twice, the matrix microstructure of tempered martensite + small pieces of carbide + was distributed particle carbide particles. The morphology of the impact fracture is that the grain surface is small deformation and quasi-cleavage along the crystalline fracture + a small amount of plastic deformation zone (overlap wave) + secondary crack + carbide phase (see photo 6). 1120 ℃ oil quenching 630 ℃ for 2 hours tempering twice, the microstructure of the matrix tempered martensite + tempered troostite + small pieces of carbide + was distributed particle carbide particles. The morphology of the impact fracture is the intergranular fracture + partial rock-like fracture + secondary crack + carbides phase with small deformed overlapped waves and quasi-cleavage mixing (see photo 12). Mechanical properties 1120 ℃ and 1080 ℃ quenching, respectively, at 560 ℃ or 630 ℃ tempering can get better strength and toughness with the match.