摘要
针对铡草机刀片对于刃口锋利度、硬度及耐磨性的严苛要求,选取具有良好综合性能的65Mn钢作为研究对象,通过分级盐浴淬火结合回火工艺实现试验钢硬度与韧性的最佳平衡,并系统研究了不同淬火加热温度对65Mn钢微观组织、硬度、耐磨性的影响。结果表明,65Mn钢加热至840℃时奥氏体化完全,淬火后的板条马氏体晶粒较为细小,且隐针状马氏体较为明显。回火后的回火马氏体中碳化物在原马氏体板条界面处析出,分布较为均匀,同时颗粒尺寸较小,弥散分布在马氏体基体中。淬火加热温度为840℃的试样在淬火和回火后的硬度最高,分别为58.04和53.50 HRC,且未过度牺牲65Mn钢的耐磨性能,满足农业机械材料的应用需求,为盐浴淬火下最优加热温度。
Focusing on the strict requirements for blade sharpness,hardness and wear resistance of chaff cutter blade,the balance between hardness and toughness of 65Mn steel was achieved through salt bath quenching with different heating temperatures and tempering.The microstructure,hardness,friction and wear resistance of the steel were studied systematically.The results show that when austenitizing at 840℃,the lath martensite of the 65Mn steel after quenching is smaller,together with clear acicular martensite.After tempering,the carbide in tempered martensite precipitates at the lath martensite interface,and its distribution is more uniform combined with smaller particle in the martensite matrix.The hardness of the steel after salt bath quenching at 840℃and tempering is the highest,which is 58.04 and 53.50 HRC,respectively,combined with no excessively loss of the wear resistance for the 65Mn steel,meeting the application requirements of agricultural machinery materials.As a consequence,salt bath quenching at 840℃and tempering is the optimal heat treatment process.
作者
杨宾
王琳
申航睿
冯松科
李国飞
刘富强
方浏昕
杨林
Yang Bin;Wang Lin;Shen Hangrui;Feng Songke;Li Guofei;Liu Fuqiang;Fang Liuxin;Yang Lin(Inner Mongolia Metal Material Research Institute,Yantai Shandong 264000,China;College of Mechanical and Electronic engineering,Northwest A&F University,Xianyang Shaanxi 712100,China)
出处
《金属热处理》
北大核心
2025年第2期102-106,共5页
Heat Treatment of Metals
关键词
65MN钢
热处理
微观组织
摩擦磨损
力学性能
铡草机刀片
65Mn steel
heat treatment
microstructure
friction and wear
mechanical properties
grass cutter blades
