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Research on the Carbides of Its Alloying Layer Conducted by W-Mo-Y Surface Alloying

By Carburizing Process, Hangwei Cai, Hongguan Wu, Zhikang Ma, Chenglei Wang, Lin Yuan, Wei Zhang, Bing Li and Yuan Gao


Abstract. Q235 steel was processed by solid carburizing and quenching after conducted by W-Mo-Y double glow-discharge plasma surface alloying process. Finally carbon contents, the morphologies and phases of the samples ' surface were analyzed. The results show as follows: Carbon contents of the samples ' surface are 1.28 wt%, 1.36 wt%, 1.51 wt % respectively after W-Mo-Y alloying layer (also called co-penetrated layer) was processed by solid carburizing at 960 ˚C, 980 ˚C, 1020 ˚C respectively; The amount of the carbides in W-Mo-Y alloying layer is obviously more than that of the carbides in W-Mo alloying layer; The granular carbides distribute dispersively and uniformly in alloying layer, and the sizes of carbide particle are less than 1 µm; There is no eutectic carbide at the grain boundaries; With temperatures of carburizing and quenching process rising, the carbides increases in number; After W-Mo-Y alloying layer was carburized and quenched at 1020 ˚C, the phases of alloying layer are Fe2C, W2C, Fe2MoC, MoC, Fe3C, Mo2C and Y2C3; and the types of their carbides are M3C, M2C, and MC, which are different from the types of W-Mo carbides in general metallurgy high-speed steel (HSS). It can be seen from the available, the morphologies, the sizes and the amount of surface HSS's carbides can be adjusted by heat treatment

Topics: W-Mo-Y alloying, The double glow plasma, Solid carburizing and quenching
Year: 2016
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