增压氮化及等温处理对60Si2CrA钢组织和性能的影响  

Effects of pressurized gas nitriding and isothermal treatment on microstructures and mechanical properties of steel 60Si2CrA

作　　者：孙淑华[1,2] 涂小龙[3] 刘嘉庆 卞文栋 王振华[2] 吕知清[2] SUN Shuhua;TU Xiaolong;LIU Jiaqing;BIAN Wendong;WANG ZhenHua;LÜ Zhiqing(School of Science,Yanshan University,Qinhuangdao,Hebei 066004,China;State Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao,Hebei 066004,China;Hangzhou Advance Gearbox Group Co.Ltd.,Hangzhou,Zhejiang 311203,China)

机构地区：[1]燕山大学理学院,河北秦皇岛066004 [2]燕山大学亚稳材料制备技术与科学国家重点实验室,河北秦皇岛066004 [3]杭州前进齿轮箱集团股份有限公司,浙江杭州311203

出　　处：《燕山大学学报》2021年第2期129-133,141,共6页Journal of Yanshan University

基　　金：上海热制造工程研究中心资助项目(18DZ2253400);河北省重点研发计划项目(20311003D);河北省自然科学基金/钢铁联合研究基金资助项目(E2020203195)。

摘　　要：用扫描电镜、X射线衍射分析等方法研究了增压气体氮化及贝氏体等温处理工艺对60Si2CrA钢的微观组织与机械性能的影响特性。结果表明:退火态试验钢经520℃增压(0.4 MPa)氮化7 h后,渗层深达225μm,表面硬度达600 HV;增压氮化后再加热到1000℃保温30 min,然后快速放入270℃盐浴炉中停留48 h,得到了大量的超细低温贝氏体组织。与传统淬火加中温回火工艺相比,将这两种工艺结合后,60Si2CrA钢的强度、塑性及韧性均显著改善,强塑积提高74%,综合力学性能大幅度提高。The influence of pressurized ammonia gas nitriding and low-temperature bainite treatment on microstructures and mechanical properties of steel 60Si2CrA steel was investigated by using optical metallography,scanning electron microscope and X-ray diffraction.The results show that after the nitriding at 520℃for 7 h(0.4 MPa),the surface hardness and depth of nitriding layer of the annealed steel reached 600 HV and 225μm,respectively.After being treated by pressurized nitriding,austenitization at 1000℃for 0.5 h,followed by quenching into salt bath at 270℃for 48 h,a lot of ultra-fine low-temperature bainite were obtained.Compared with the traditional process(quenching plus medium-temperature tempering),the strength,plasticity and toughness of 60Si2CrA steel are significantly improved by combining the abovementioned two processes.The strength and elongation of the products are increased by 74%and,thus the comprehensive mechanical properties are greatly improved.

关 键 词：弹簧钢 增压气体氮化 氮化层 低温贝氏体 等温转变 力学性能 

分 类 号：TG142.1[一般工业技术—材料科学与工程]