锻造斗齿的热处理工艺及组织性能  

Heat treatment process of forged bucket tooth and its microstructure and properties

作　　者：王宇飞[1] 智爱娟[2] 张冠峰 张少鹏 张旦闻 任凤章[1] Wang Yufei;Zhi Aijuan;Zhang Guanfeng;Zhang Shaopeng;Zhang Danwen;Ren Fengzhang(School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang Henan 471023,China;School of Information Technology,Luoyang Normal University,Luoyang Henan 471934,China;Luoyang Guanzhuo Heavy Equipment Limited Corporation,Luoyang Henan 471132,China;School of Mechanical Engineering,Luoyang Institute of Science and Technology,Luoyang Henan 471023,China)

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471023 [2]洛阳师范学院信息技术学院,河南洛阳471934 [3]洛阳冠卓重工设备有限公司,河南洛阳471132 [4]洛阳理工学院机械工程学院,河南洛阳471023

出　　处：《金属热处理》2020年第1期188-192,共5页Heat Treatment of Metals

基　　金：河南省科技发展计划(182102210103);河南省高等学校重点科研项目(18A460025)

摘　　要：以锻造斗齿成品及斗齿用30CrMnSi钢亚温淬火工艺为研究对象,对斗齿成品不同部位的洛氏硬度及显微组织进行了分析;对30CrMnSi钢经不同模拟锻造余热淬火工艺处理后的组织和性能进行了对比研究。结果表明:斗齿成品表面硬度略低于次表层2~3 HRC,齿尖硬度高于齿根硬度5~10 HRC。通过模拟锻造余热分段淬火工艺,30CrMnSi钢在870℃水淬时,其冲击韧性最高,为74 J;当淬火温度低于870℃时,由于奥氏体化不均匀或较多铁素体的出现会导致冲击韧性降低;当淬火温度高于870℃时,由于加热时奥氏体晶粒粗大,淬火后所得马氏体也粗大,冲击韧性降低。建议生产中采用斗齿齿尖、齿根同时入水的整体淬火工艺,以使斗齿整体获得较高的硬度和韧性。The Rockwell hardness and microstructure of different locations of 30CrMnSi steel bucket teeth forged and intercritical quenched were analyzed,respectively. The microstructure and properties of 30CrMnSi steel treated by different simulated forging residual heat quenching process were compared. The results show that the surface hardness of the bucket tooth is slightly lower than the subsurface by 2-3 HRC,tooth tip hardness is higher than the root by 5-10 HRC. By simulating forging residual heat subsection quenching,the impact toughness of 30CrMnSi steel is the highest when quenched at 870 ℃,which is 74 J. When the quenching temperature is below 870 ℃,the impact toughness will decrease due to inhomogeneous austenitization or the appearance of more ferrite;When the quenching temperature is higher than 870 ℃,due to the austenite grain coarsening during heating,the martensite obtained after quenching is also coarse,and the impact toughness decreases. It is suggested that the integral quenching process of the tooth tip and tooth root entering water at the same time should be adopted,in order to obtain higher hardness and toughness for the whole bucket tooth.

关 键 词：锻造斗齿 30CRMNSI钢 锻造余热淬火 硬度 冲击韧性 

分 类 号：TG162.79[金属学及工艺—热处理]