塑料模具顶杆用钢65MnV强韧性本质的探讨  

STUDY ON THE NATURE OF STRENGTHENINGTOUGHENINGFOR PLASTIC DIE EJECTOR PIN STEEL 65MnV

作　　者：程宇航[1] 赵建生[1] 吴一平 陈建国[1] 乔学亮[1] 孙培祯 

机构地区：[1]华中理工大学

出　　处：《钢铁》1998年第5期53-56,共4页Iron and Steel

摘　　要：研究了６５ＭｎＶ钢在淬火和回火条件下的微观结构以及其力学性能随回火温度的变化。结果表明，６５ＭｎＶ钢经８４０℃淬火、１８０～２２０℃回火可获得高的强韧性；并且钢中含有０．１％、直径为１０～５０ｎｍ弥散分布的ＶＣ颗粒，奥氏体晶粒平均直径为７．０μｍ；钢的淬火组织为位错型板条马氏体和分布其间的薄膜状残余奥氏体；低于２２０℃回火时，钢中只析出２～１５ｎｍ粗细、长度为３０～１４０ｎｍ均匀分布的须状ε碳化物。这些亚结构的配合是６５ＭｎＶ钢具有高强韧性的本质。The dependence of mechanical properties on tempering temperature and the microstructure of ejector pin steel 65MnV after quenching and tempering has been studied in detail.Result shows that a good combination of strength and toughness can be gained after quenching at 840 ℃ and tempering in the range of 180～220 ℃;there is 01 % of undissolved VC with the size of 10～50 nm dispersing in martensite;the average austenite grain size is 70 μm;the fine structure of martensite is of dislocation type with stable retained austenite films observed at the lathe boundries;only εcarbide with the size of 2～15 nm,and the length of 30～140 nm is precipitated after tempering below 220 ℃.The combination of these substructures is the nature of high strength and toughness of 65MnV steel.

关 键 词：顶杆 65MnV 强韧性 亚结构 塑料模具 

分 类 号：TQ320.52[化学工程—合成树脂塑料工业]