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大功率高速柴油机的曲轴必须具有较好的综合机械性能和较高的表面耐磨性。用中碳低合金钢50CrMoA经过调质热处理和中频感应加热表面硬化处理,可达到上述要求。Cr和Mo在钢中均能形成碳化物,并部分溶入固溶体中,从而降低钢在淬火时的临界冷却速度,增加淬透性,使整个曲轴截面调质热处理后的机械性能近乎一致;增加回火稳定性,提高材料的冲击韧性;使晶粒细化,组织致密;强化铁
High-power high-speed diesel engine crankshaft must have better overall mechanical properties and high surface wear resistance. Carbon medium low alloy steel 50CrMoA after conditioning heat treatment and induction heating surface hardening treatment, can meet the above requirements. Cr and Mo can form carbides in the steel and partially dissolve into the solid solution, so as to reduce the critical cooling rate of the steel during quenching and increase the hardenability, so that the mechanical properties after the heat treatment of the whole crankshaft cross-section are almost the same; Tempering stability, improve the impact toughness of the material; the grain refinement, dense organization; strengthened iron