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Volume 25 Issue 8
Aug.  2018
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文章导航 >  矿物冶金与材料学报（英文）  > 2018  >  25(8): 892-901
Dan Wu, Fu-ming Wang, Jin Cheng,  and Chang-rong Li, Effect of Nb and V on the continuous cooling transformation of undercooled austenite in Cr–Mo–V steel for brake discs, Int. J. Miner. Metall. Mater., 25(2018), No. 8, pp. 892-901. https://doi.org/10.1007/s12613-018-1638-z
Cite this article as:
Dan Wu, Fu-ming Wang, Jin Cheng,  and Chang-rong Li, Effect of Nb and V on the continuous cooling transformation of undercooled austenite in Cr–Mo–V steel for brake discs, Int. J. Miner. Metall. Mater., 25(2018), No. 8, pp. 892-901. https://doi.org/10.1007/s12613-018-1638-z
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研究论文

Effect of Nb and V on the continuous cooling transformation of undercooled austenite in Cr–Mo–V steel for brake discs

  • School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China

  • School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083 China

  • 通讯作者:

    Fu-ming Wang    E-mail: wangfuming@metall.ustb.edu.cn

  • The increasing speed of trains necessitates the development of brake-disc materials that meet more stringent requirements. Therefore, Nb and V have been added to Cr–Mo–V steel to improve its thermal fatigue performance when used in brake discs. In this paper, the influences of Nb and V on the static continuous cooling transformation (CCT) behaviors of undercooled austenite were studied. The microstructures, hardness, and dislocation densities at different cooling rates and with the addition of different alloying elements were also investigated. The results show that the transformation products of ferrite, granular bainite, lower bainite, and martensite form under different cooling conditions. With increasing Nb and V contents, the CCT curves are shifted to the left, ferrite and bainite transformations are promoted, and the critical cooling rate of total martensite formation is increased. The added V mainly forms V-rich M8C7 precipitates and reduces the dissolved C content; therefore, the Ac1, Ac3, and Ms-point temperatures increase. Moreover, the stability of retained austenite is also reduced; its content therefore decreases. Compared with V, the effect of added Nb is weaker because of its smaller content. However, the addition of Nb improves the hardness at lower cooling rates because of the precipitation of fine NbC particles and refining of the microstructure.
    • Research Article

    Effect of Nb and V on the continuous cooling transformation of undercooled austenite in Cr–Mo–V steel for brake discs

    + Author Affiliations
      Abstract
    • The increasing speed of trains necessitates the development of brake-disc materials that meet more stringent requirements. Therefore, Nb and V have been added to Cr–Mo–V steel to improve its thermal fatigue performance when used in brake discs. In this paper, the influences of Nb and V on the static continuous cooling transformation (CCT) behaviors of undercooled austenite were studied. The microstructures, hardness, and dislocation densities at different cooling rates and with the addition of different alloying elements were also investigated. The results show that the transformation products of ferrite, granular bainite, lower bainite, and martensite form under different cooling conditions. With increasing Nb and V contents, the CCT curves are shifted to the left, ferrite and bainite transformations are promoted, and the critical cooling rate of total martensite formation is increased. The added V mainly forms V-rich M8C7 precipitates and reduces the dissolved C content; therefore, the Ac1, Ac3, and Ms-point temperatures increase. Moreover, the stability of retained austenite is also reduced; its content therefore decreases. Compared with V, the effect of added Nb is weaker because of its smaller content. However, the addition of Nb improves the hardness at lower cooling rates because of the precipitation of fine NbC particles and refining of the microstructure.
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