工程科学学报，第40卷，第12期：1502-1509,2018年12月 Chinese Journal of Engineering,Vol.40,No.12:1502-1509,December 2018 DOI:10.13374/j.issn2095-9389.2018.12.008;http://journals.ustb.edu.cn 等温淬火温度对超细贝氏体钢组织及耐磨性的影响 张 超”，郭辉2)，王家星3》，张冰”，赵爱民)四 1)北京科技大学钢铁共性技术协同创新中心，北京1000832)潍坊科技学院机械工程学院，寿光262700 3)北京科技大学工程技术研究院，北京100083 ☒通信作者，E-mail:zhaoaimin@usth.edu.cn 摘要设计了一种0.7C的低合金超细贝氏体钢，并通过膨胀仪、二体磨损实验、光学显微镜、扫描电镜、X射线衍射、激光扫 描共聚焦显微镜及能谱仪，研究了不同等温淬火温度对超细贝氏体钢的贝氏体相变动力学、微观组织以及干滑动摩擦耐磨性 的影响，揭示超细贝氏体钢在二体磨损条件下的耐磨性能和磨损机理.研究结果表明，不同等温温度下的超细贝氏体钢都由 片层状贝氏体铁素体和薄膜状以及块状的残留奥氏体组成：随着等温温度的升高，超细贝氏体的相变速率提高，相变孕育期 及相变完成时间缩短，但贝氏体铁素体板条厚度增加，残留奥氏体含量增加，硬度值有所降低：超细贝氏体钢磨损面形貌以平 直的犁沟为主，主要的磨损机理为显微切削：不同等温温度下所获得的超细贝氏体的耐磨性能都优于回火马氏体，且随着等 温温度的降低，耐磨性能提高.其中在250℃等温所获得的超细贝氏体钢具有最优的耐磨性能，其相对耐磨性为回火马氏体 的1.28倍.这主要与超细贝氏体钢中贝氏体铁素体板条的细化及磨损过程中残留奥氏体的形变诱导马氏体相变(TRP)效应 有关. 关键词超细贝氏体钢：相变动力学：残留奥氏体：耐磨性能：TRP效应 分类号TG142.71 Effect of austempering temperature on the microstructure and wear resistance of ultrafine bainitic steel ZHANG Chao”,CU0Hhi,2),WANG Jia-xing),ZHANG Bing”,ZHA0Ai-min回 1)Collaborative Innovation Center of Steel Technology,University of Science and Technology Beijing,Beijing 100083.China 2)School of Mechanical Engineering.Weifang University of Science and Technology,Shouguang 262700,China 3)Engineering Research Institute,University of Science and Technology Beijing,Beijing 100083,China Corresponding author,E-mail:zhaoaimin@ustb.edu.cn ABSTRACT Ultrafine bainitic steels,which are derived from nanostructured carbide-free bainitic steels,exhibit a remarkable combi- nation of ultra-high strength and toughness together with excellent wear resistance.Their excellent integrated mechanical properties has made ultrafine bainitic steels a popular choice for application as wear-resistant parts.In this study,a 0.7-C low alloy ultrafine bainitic steel was designed,and the effects of different austempering temperatures on the bainitic transformation kinetics,microstructure,and dry sliding wear resistance of ultrafine bainitic steels were studied.Dilatometry,two-body abrasion testing,optical microscopy (OM), scanning electron microscopy (SEM),X-ray diffraction,laser-scanning confocal microscopy,and energy-dispersive spectrometry were used to study the abovementioned effects.Meanwhile,the wear performance and wear mechanism under two-body abrasion of ultrafine baintic steels with different austempering temperatures were also studied.The results demonstrate that the microstructures of ultrafine bainitic steel produced at different austempering temperatures comprise both lamellar bainitic ferrite and film-like and blocky retained austenite.With increasing austempering temperature,the transformation rate of bainite increases,and the incubation period and phase 收稿日期：2017-12-05 基金项目：国家自然科学基金资助项目(U1560107)工程科学学报,第 40 卷,第 12 期:1502鄄鄄1509,2018 年 12 月 Chinese Journal of Engineering, Vol. 40, No. 12: 1502鄄鄄1509, December 2018 DOI: 10. 13374 / j. issn2095鄄鄄9389. 2018. 12. 008; http: / / journals. ustb. edu. cn 等温淬火温度对超细贝氏体钢组织及耐磨性的影响 张 超1) , 郭 辉1,2) , 王家星3) , 张 冰1) , 赵爱民1) 苣 1) 北京科技大学钢铁共性技术协同创新中心, 北京 100083 2) 潍坊科技学院机械工程学院, 寿光 262700 3) 北京科技大学工程技术研究院, 北京 100083 苣通信作者, E鄄mail:zhaoaimin@ ustb. edu. cn 摘 要 设计了一种 0郾 7C 的低合金超细贝氏体钢,并通过膨胀仪、二体磨损实验、光学显微镜、扫描电镜、X 射线衍射、激光扫 描共聚焦显微镜及能谱仪,研究了不同等温淬火温度对超细贝氏体钢的贝氏体相变动力学、微观组织以及干滑动摩擦耐磨性 的影响,揭示超细贝氏体钢在二体磨损条件下的耐磨性能和磨损机理. 研究结果表明,不同等温温度下的超细贝氏体钢都由 片层状贝氏体铁素体和薄膜状以及块状的残留奥氏体组成;随着等温温度的升高,超细贝氏体的相变速率提高,相变孕育期 及相变完成时间缩短,但贝氏体铁素体板条厚度增加,残留奥氏体含量增加,硬度值有所降低;超细贝氏体钢磨损面形貌以平 直的犁沟为主,主要的磨损机理为显微切削;不同等温温度下所获得的超细贝氏体的耐磨性能都优于回火马氏体,且随着等 温温度的降低,耐磨性能提高. 其中在 250 益等温所获得的超细贝氏体钢具有最优的耐磨性能,其相对耐磨性为回火马氏体 的 1郾 28 倍. 这主要与超细贝氏体钢中贝氏体铁素体板条的细化及磨损过程中残留奥氏体的形变诱导马氏体相变(TRIP)效应 有关. 关键词 超细贝氏体钢; 相变动力学; 残留奥氏体; 耐磨性能; TRIP 效应 分类号 TG142郾 71 收稿日期: 2017鄄鄄12鄄鄄05 基金项目: 国家自然科学基金资助项目(U1560107) Effect of austempering temperature on the microstructure and wear resistance of ultrafine bainitic steel ZHANG Chao 1) , GUO Hui 1,2) , WANG Jia鄄xing 3) , ZHANG Bing 1) , ZHAO Ai鄄min 1) 苣 1) Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China 2) School of Mechanical Engineering, Weifang University of Science and Technology, Shouguang 262700, China 3) Engineering Research Institute, University of Science and Technology Beijing, Beijing 100083, China 苣Corresponding author, E鄄mail: zhaoaimin@ ustb. edu. cn ABSTRACT Ultrafine bainitic steels, which are derived from nanostructured carbide鄄free bainitic steels, exhibit a remarkable combi鄄 nation of ultra鄄high strength and toughness together with excellent wear resistance. Their excellent integrated mechanical properties has made ultrafine bainitic steels a popular choice for application as wear鄄resistant parts. In this study, a 0郾 7鄄C low alloy ultrafine bainitic steel was designed, and the effects of different austempering temperatures on the bainitic transformation kinetics, microstructure, and dry sliding wear resistance of ultrafine bainitic steels were studied. Dilatometry, two鄄body abrasion testing, optical microscopy (OM), scanning electron microscopy (SEM), X鄄ray diffraction, laser鄄scanning confocal microscopy, and energy鄄dispersive spectrometry were used to study the abovementioned effects. Meanwhile, the wear performance and wear mechanism under two鄄body abrasion of ultrafine baintic steels with different austempering temperatures were also studied. The results demonstrate that the microstructures of ultrafine bainitic steel produced at different austempering temperatures comprise both lamellar bainitic ferrite and film鄄like and blocky retained austenite. With increasing austempering temperature, the transformation rate of bainite increases, and the incubation period and phase