摘要
对比研究了4种Cr8型模具钢的硬度、冲击韧性、抗弯强度及耐磨性能,借助JMatPro分别计算Cr8和Cr12型模具钢的碳化物类型与数量,讨论Cr8型模具钢合金化原理。结果表明:新型高强韧冷作模具钢SDC99成分设计合理,实物质量与进口钢相当。Cr8型模具钢通过成分调整,降低M7C3型莱氏体碳化物含量,大幅度提高冲击韧性;同时提高Mo、V等强碳化物形成元素含量,以增加二次碳化物,保证碳化物总量,提高耐磨性;加入Ni、Si等非碳化物形成元素细化晶粒,强化基体,增强韧性。
Hardness, impact toughness, bend strength and wear resistance of a new developed cold work die steel SDC99 were examined and compared with those of Cr8 type die steels. Type and amount of carbides in Cr8 and Crl2 die steels were simulated by JMatPro, alloy design principle of Cr8 die steel was discussed. Experimental results indicate that the new develeped die steel SDC99 shows excellent mechanical properties. Through modifying the chemical composition, impact toughness of Cr8 tool steel is improved substantially by reducing M7C3 ledeburite carbides. Strong carbide forming elements such as Mo, V in Cr8 tool steel are increased for more secondary carbides to improve wear resistance. Non-carbide forming elements like Ni, Si are added to fine grains, strengthen matrix and improve toughness.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2013年第4期80-84,共5页
Transactions of Materials and Heat Treatment
基金
国家科技支撑计划资助项目(2007BAE510B04)
上海市重点学科建设项目资助(S30107)
