【摘要】 研究了850℃奥氏体化后冷却方式及回火温度对35CrMo钢显微组织和硬度的影响。结果表明,850℃淬火后,水淬钢组织为板条马氏体和板条贝氏体,硬度为470 HV50,空淬钢组织为粒状贝氏体和针状铁素体,硬度为308 HV50。随回火温度升高,水淬钢和空淬钢的硬度逐渐降低,板条马氏体、板条贝氏体和粒状贝氏体数量逐渐减少,铁素体数量增加并粗化,碳化物增多。水淬钢620℃回火后,组织中的板条结构、薄片状M/A组元,高密度位错以及细小碳化物使其仍具有较高的硬度。更多还原

【Abstract】 Effects of quenching way and tempering temperature on microstructure and hardness of 35CrMo pre-hardened plastic die steel were investigated.The results show that austenized at 850 ℃,microstructure of the water-quenched steel consists of lath martensite and lath bainite and its hardness is 470 HV50,while that of the air-quenched steel consists of granular bainite and acicular ferrite and its hardness is 308 HV50.With tempering temperature increasing,hardness of the steel both water-quenched and air-quenched decreases,the content of lath martensite,bainite ferrite and granular bainite reduces,ferrite quantity increases and coarsens and carbides increase.Due to the lath structure,lamellar M/A constituent,high density dislocation and fine carbides,the water-quenched steel still has higher hardness after tempered at 620 ℃.更多还原