热处理对35CrMo预硬型塑料模具钢组织与硬度的影响  

Effects of heat treatment process on microstructure and hardness of 35CrMo pre-hardened plastic die steel

作　　者：吴会亮[1] 周平[1] 霍孝新[1] 黄少文[1] 

机构地区：[1]莱芜钢铁集团有限公司技术中心,山东莱芜271100

出　　处：《金属热处理》2013年第12期54-57,共4页Heat Treatment of Metals

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。Effects of quenching way and tempering temperature on microstructure and hardness of 35 CrMo 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 HVS0, while that of the air-quenched steel consists of granular bainite and acicular ferrite and its hardness is 308 HVS0. 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 ℃.

关 键 词：35CrMo塑料模具钢 热处理 显微组织 硬度 

分 类 号：TG142.1[一般工业技术—材料科学与工程]