热处理对65Mn钢表面渗硼层组织和性能的影响  

Effects of heat treatment on microstructure and properties of boriding layer on 65Mn steel

作　　者：王宏宇[1] 赵玉凤[1] 许晓静[1] 沈清[1] 吴志奎[1] 

机构地区：[1]江苏大学机械工程学院,江苏镇江212013

出　　处：《材料热处理学报》2012年第12期142-146,共5页Transactions of Materials and Heat Treatment

基　　金：国家科技支撑计划资助项目(2011BAD20B00);江苏省产学研联合创新资金计划资助项目(BY2010130);江苏大学高级专业人才科研启动基金资助项目(11JDG126)

摘　　要：研究淬火-中温回火和等温淬火两种热处理工艺对65Mn钢表面渗硼层组织和性能的影响。结果表明:经该工艺热处理后,65Mn钢表面渗硼试样呈现出典型的表硬芯韧组织特征,其表面为高硬抗磨的硼化物,芯部为强韧的回火屈氏体或下贝氏体;同时,渗硼层物相由以FeB相为主转变为以Fe2B相为主,虽硬度、耐磨性有所下降但其脆性降低了1～2个等级;此外,等温淬火处理在降低热处理应力、保持表面硬度及耐磨性和改善芯部强韧性等方面均好于淬火-中温回火处理。Effects of quenching and tempering at medium temperature and isothermal quenching on microstructure and properties of boriding layer of 65Mn steel boronized were investigated. The results show that the boronized 65Mn steel after the heat treatment is characterized by typical hard-surface and toughening-core mierostrueture,whieh consists of high-hardness and wear resistant boride layer of surface and tempered troostite or lower bainte with good combination of strength and toughness in core. Meanwhile, the main phase of boriding layer is transformed from FeB to Fe2 B after the head treatment, which results in the brittleness decrease by 1-2 grade although the hardness and wear resistance are also ligtly reduced. Moreover, the isothermal quenching exhibits positive effects in decreasing heat treatment stress, keeping surface hardness and wear resistance and improving strength and toughness of the core than that by quenching and tempering at medium temperature.

关 键 词：结构钢 渗硼处理 热处理 强韧化 

分 类 号：TG156.31[金属学及工艺—热处理] TG156.87[金属学及工艺—金属学]