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

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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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Acknowledgements

This work was financially supported by the National Nature Science Foundation of China (Nos. 51674020 and 51571019) and the National Key Research and Development Program of China (No. 2016YFB0300102-5).

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Authors and Affiliations

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

    Dan Wu, Fu-ming Wang & Jin Cheng

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

    Chang-rong Li

Authors
  1. Dan Wu
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  2. Fu-ming Wang
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  3. Jin Cheng
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  4. Chang-rong Li
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Correspondence to Fu-ming Wang.

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Wu, D., Wang, Fm., Cheng, J. et al. 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, 892–901 (2018). https://doi.org/10.1007/s12613-018-1638-z

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  • DOI: https://doi.org/10.1007/s12613-018-1638-z

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