摘要
以预硬化塑料模具钢NAK80和S136为研究对象,对比研究了两者的显微硬度、金相组织以及不同载荷下的摩擦磨损行为。结果表明:NAK80钢金相组织为板条状马氏体和粒状贝氏体,S136钢的金相组织为铁素体基体和细小碳化物,显微硬度(HV)分别为405.01±10.63和354.21±6.14。NAK80和S136钢的摩擦系数均随着载荷的增加而降低,在60 N时,两者都达到各自最低的摩擦系数(0.34和0.37),当载荷增加至80 N,摩擦系数反而上升。整体而言,S136的摩擦系数高于NAK80。不同载荷条件下,NAK80的磨损行为具有高的载荷敏感性;而S136具有更加稳定的耐磨性。低载荷时,以磨粒磨损和剥层磨损为主,NAK80耐磨性优于S136;高载荷时,以粘着磨损和磨粒磨损为主,S136钢耐磨性优于NAK80。
The microhardness,microstructure,friction and wear behavior of pre-hardened plastic die steels NAK80 and S136 were studied.The results show that the microstructure of NAK80 steel consists of lath martensite and granular bainite,while that of S136 steel are ferrite matrix and fine carbides,and the microhardness is 405.01±63 HV and 354.21 HV±6.14 HV respectively.The friction coefficients of NAK80 and S136 steel decrease with the increase of load.At 60 N,the friction coefficients of NAK80 and S136 steel reach their lowest values(0.34 and 0.37).However,when the load increases to 80 N,the friction coefficient increases.Overall,the friction coefficient of S136 is higher than that of NAK80.The wear behavior of NAK80 has high load sensitivity under different load conditions while S136 has more stable wear resistance.At low load,abrasive wear and delamination wear are dominant,and the wear resistance of NAK80 is better than that of S136.At high load,adhesive wear and abrasive wear are dominant,and the wear resistance of S136 steel is better than that of NAK80.
作者
谢毅
鲜勇
Xie Yi;Xian Yong(School of Automotive Engineering,Chongqing Three Gorges Vocational College,Wanzhou 404000,Chongqing,China;School of Materials and Environmental Engineering,Chengdu Technological University,Chengdu 611730,Sichuan,China)
出处
《钢铁钒钛》
CAS
北大核心
2021年第4期144-148,共5页
Iron Steel Vanadium Titanium
关键词
模具钢
载荷
硬度
组织
耐磨性能
die steel
load
hardness
microstructure
wear resistance properties
