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 ℃.
出处
《金属热处理》
CAS
CSCD
北大核心
2013年第12期54-57,共4页
Heat Treatment of Metals
