“零保温”淬火工艺对40Cr钢组织与性能的影响  

Effect of quenching without holding on microstructure and mechanical properties of 40Cr steel

作　　者：康学勤 许正茂[1] 林恩波 陈亮 Kang Xueqin;Xu Zhengmao;Lin Enbo;Chen Liang(Xuzhou Wanda Slewing Bearing Company Limited,Xuzhou Jiangsu 221000,China;Xuzhou Shenwei Jiye Machinery Technology Company Limited,Xuzhou Jiangsu 221000,China;School of Materials Science and Engineering,China University of Mining and Technology,Xuzhou Jiangsu 221116,China)

机构地区：[1]徐州万达回转支承有限公司,江苏徐州221000 [2]徐州神威基业机械科技有限公司,江苏徐州221000 [3]中国矿业大学材料科学与工程学院,江苏徐州221116

出　　处：《金属热处理》2020年第8期105-107,共3页Heat Treatment of Metals

基　　金：徐州市政策引导类计划(科技合作)(KC18249)。

摘　　要：研究了不同温度"零保温"淬火工艺下,40Cr钢的显微组织与性能的变化规律。结果表明,在850~910℃下"零保温"淬火和550℃回火后,40Cr钢的硬度、抗拉强度和冲击吸收能量随温度的升高先增加后降低。890℃"零保温"淬火和550℃回火时,钢的硬度、抗拉强度和冲击吸收能量达到最高值,这些性能均优于同温度下保温淬火时试验钢的性能。40Cr钢"零保温"淬火性能的提高与其淬火后得到的细小板条状马氏体组织、奥氏体晶粒的细化和奥氏体中碳浓度分布不均匀有关。Microstructure and properties of the 40 Cr steel quenched at different temperatures without holding were studied.The results show that when quenched in the range of 850-910 ℃ without holding and tempered at 550 ℃,the hardness,tensile strength and impact absorbed energy of the 40 Cr steel increase first and then decrease with the increase of quenching temperature.The highest hardness,tensile strength and impact absorbed energy can be obtained when quenched at 890 ℃ without holding and tempered at 550 ℃,and these properties are better than that by traditional quenching with holding.The property improvement of the 40 Cr steel after quenching without holding is related to its fine lath martensite,austenite grain refinement and non-uniform distribution of carbon concentration in austenite.

关 键 词：40CR钢 “零保温”淬火 显微组织 性能 

分 类 号：TG15[金属学及工艺—热处理]