工程科学学报，第40卷，第1期：68-75,2018年1月 Chinese Journal of Engineering,Vol.40,No.I:68-75,January 2018 DOI:10.13374/j.issn2095-9389.2018.01.009;http://journals.ustb.edu.cn 钒对高铁制动盘钢中碳化物析出及力学性能的影响 吴丹)，王福明)四，程锦)，李长荣2) 1)北京科技大学治金与生态工程学院，北京1000832)北京科技大学材料科学与工程学院，北京100083 ☒通信作者，E-mail:wangfuming(@metall..usth.cdu.cn 摘要随着列车时速不断提高，制动盘承受的热负荷不断增大，这对制动盘材料提出了更高的要求.为了提高制动盘钢的 机械性能及耐热疲劳性，钒元素被添加到制动盘钢中.本文研究了不同淬火温度时V含量对C一Mo-V系制动盘钢组织及力 学性能的影响，并通过Thermo-~Cac热力学软件、碳复型、透射电镜、能谱分析等方法对不同V含量时析出相的演变规律进行 研究.结果表明，增加钒含量使高温析出的V(C,N)含量增加，细化奥氏体品粒和回火马氏体组织.淬-回火态析出相主要为 V(C,N)、(Mo,V)C、M,C和MC6·随钒含量增加，大尺寸M2C6和M,C的析出被抑制，对韧性损害降低；小尺寸(Mo,V)C含 量增多，析出强化效果增强.淬火温度为880~900℃时，增加钒含量能细化马氏体和减少大尺寸碳化物，弥补了析出强化对 韧性的损害，故冲击功变化不大.淬火温度为920-940℃时，提高钒含量促使(M0,V)C量急剧增加，冲击功快速下降.实验 钢淬火温度不应超过900℃. 关键词制动盘钢；析出相：钒；显微组织；淬火温度 分类号TG142.1 Effect of V on carbide precipitation behavior and mechanical properties of brake disc steel for high-speed trains WU Dan),WANG Fu-ming,CHENG Jin,LI Chang-rong?) 1)Sehool of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China 2)School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China XCorresponding author,E-mail:wangfuming@metall.ustb.edu.cn ABSTRACT With the increasing speed of high-speed trains,the brake disc heat load has also been increasing,particularly during emergency braking.Therefore,to address such issues,strict requirements for brake disc materials are suggested.Thus,the addition of V was implemented to improve the mechanical properties and thermal fatigue performance of brake disc steel.The effect of V on the mi- crostructure and mechanical properties of Cr-Mo-V steel for brake discs at different quenching temperatures was investigated.The pre- cipitation behavior of carbides at different V levels was also investigated through thermodynamics calculation using the Thermo-Calc software,carbon replica,transmission electron microscopy (TEM),and energy dispersive spectroscopy (EDS).The results indicate that the amount of V(C,N),which precipitates at high temperatures,increases;therefore,the austenite grains and martensite packets are refined.The precipitates in the tested steels after being quenched and tempered are mainly V(C,N),(Mo,V)C,M,C,and M2 C With an increase in V content,the precipitation of large size carbides,such as MC and M,Ca,is suppressed;therefore,its negative effect on toughness is reduced.With the increase in the amount of small-size (Mo,V)C,the precipitation strengthening effect is enhanced.When the quenching temperature is in the range of 880-900C,the increments of vanadium content could refine martens- ite and reduce the content of large size carbides,which negatively affect toughness.Therefore,the impact energy changes little.When the quenching temperature is in the range of 920-940 C,increasing the vanadium content results in a significant increase in the (Mo, 收稿日期：2017-08-12 基金项目：国家自然科学基金资助项目(51674020)工程科学学报,第 40 卷,第 1 期:68鄄鄄75,2018 年 1 月 Chinese Journal of Engineering, Vol. 40, No. 1: 68鄄鄄75, January 2018 DOI: 10. 13374 / j. issn2095鄄鄄9389. 2018. 01. 009; http: / / journals. ustb. edu. cn 钒对高铁制动盘钢中碳化物析出及力学性能的影响 吴 丹1) , 王福明1) 苣 , 程 锦1) , 李长荣2) 1)北京科技大学冶金与生态工程学院, 北京 100083 2) 北京科技大学材料科学与工程学院, 北京 100083 苣通信作者,E鄄mail: wangfuming@ metall. ustb. edu. cn 摘 要 随着列车时速不断提高,制动盘承受的热负荷不断增大,这对制动盘材料提出了更高的要求. 为了提高制动盘钢的 机械性能及耐热疲劳性,钒元素被添加到制动盘钢中. 本文研究了不同淬火温度时 V 含量对 Cr鄄鄄Mo鄄鄄V 系制动盘钢组织及力 学性能的影响,并通过 Thermo鄄鄄Calc 热力学软件、碳复型、透射电镜、能谱分析等方法对不同 V 含量时析出相的演变规律进行 研究. 结果表明,增加钒含量使高温析出的 V(C, N)含量增加,细化奥氏体晶粒和回火马氏体组织. 淬鄄鄄回火态析出相主要为 V(C,N)、(Mo,V)C、M7C3和 M23C6 . 随钒含量增加,大尺寸 M23C6和 M7C3的析出被抑制,对韧性损害降低;小尺寸(Mo,V)C 含 量增多,析出强化效果增强. 淬火温度为 880 ~ 900 益时,增加钒含量能细化马氏体和减少大尺寸碳化物,弥补了析出强化对 韧性的损害,故冲击功变化不大. 淬火温度为 920 ~ 940 益时,提高钒含量促使(Mo,V)C 量急剧增加,冲击功快速下降. 实验 钢淬火温度不应超过 900 益 . 关键词 制动盘钢; 析出相; 钒; 显微组织; 淬火温度 分类号 TG142郾 1 收稿日期: 2017鄄鄄08鄄鄄12 基金项目: 国家自然科学基金资助项目(51674020) Effect of V on carbide precipitation behavior and mechanical properties of brake disc steel for high鄄speed trains WU Dan 1) , WANG Fu鄄ming 1) 苣 , CHENG Jin 1) , LI Chang鄄rong 2) 1) School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China 2) School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China 苣Corresponding author, E鄄mail: wangfuming@ metall. ustb. edu. cn ABSTRACT With the increasing speed of high鄄speed trains, the brake disc heat load has also been increasing, particularly during emergency braking. Therefore, to address such issues, strict requirements for brake disc materials are suggested. Thus, the addition of V was implemented to improve the mechanical properties and thermal fatigue performance of brake disc steel. The effect of V on the mi鄄 crostructure and mechanical properties of Cr鄄鄄Mo鄄鄄V steel for brake discs at different quenching temperatures was investigated. The pre鄄 cipitation behavior of carbides at different V levels was also investigated through thermodynamics calculation using the Thermo鄄鄄 Calc software, carbon replica, transmission electron microscopy (TEM), and energy dispersive spectroscopy (EDS). The results indicate that the amount of V(C, N), which precipitates at high temperatures, increases; therefore, the austenite grains and martensite packets are refined. The precipitates in the tested steels after being quenched and tempered are mainly V(C, N), (Mo,V)C, M7C3 , and M23 C6 . With an increase in V content, the precipitation of large size carbides, such as M23 C6 and M7 C3 , is suppressed; therefore, its negative effect on toughness is reduced. With the increase in the amount of small鄄size (Mo,V)C, the precipitation strengthening effect is enhanced. When the quenching temperature is in the range of 880鄄鄄900 益 , the increments of vanadium content could refine martens鄄 ite and reduce the content of large size carbides, which negatively affect toughness. Therefore, the impact energy changes little. When the quenching temperature is in the range of 920鄄鄄940 益 , increasing the vanadium content results in a significant increase in the (Mo