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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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International Journal of Minerals,Metallurgy and Materials 2018年第8期25卷 892-901页

作者： Dan Wu Fu-ming Wang Jin Cheng Chang-rong Li School of Metallurgical and Ecological Engineering University of Science and Technology Beijing School of Materials Science and Engineering University of Science and Technology Beijing

The increasing speed of trains necessitates the development of brake-disc materials that meet more stringent ***,Nb and V have been added to Cr–Mo–V steel to improve its thermal fatigue performance when used in brake *** this paper,the influences of Nb and V on the static continuous cooling transformation(CCT)behaviors of undercooled austenite were *** microstructures,hardness,and dislocation densities at different cooling rates and with the addition of different alloying elements were also *** results show that the transformation products of ferrite,granular bainite,lower bainite,and martensite form under different cooling *** 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 *** added V mainly forms V-rich M_8C_7 precipitates and reduces the dissolved C content;therefore,the A_(c1),A_(c3),and M_s-point temperatures ***,the stability of retained austenite is also reduced;its content therefore *** with V,the effect of added Nb is weaker because of its smaller ***,the addition of Nb improves the hardness at lower cooling rates because of the precipitation of fine Nb C particles and refining of the microstructure.

关键词： brake-disc steel niobium vanadium microstructure continuous cooling transformation

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