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

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.

Preparation and dynamic behavior of W-Mo-Y co infiltrated layer on the surface of 45 steel parts

“…2, the W-Mo infiltrated layer is mainly composed of Fe2Mo、Fe2W、Fe7W6 and other phases. The W-Mo-Y layer is mainly composed of Fe (W、 Mo、 Y) 、 Fe3Mo、 Fe17Y2、 W、 Y and other phases, which is due to the low electronegativity of rare earth Y and the large difference between ferroelectronegativity, forming complex intermetallic compounds [12] . In the W-Mo-Y co infiltration test, the content distribution of Y in the infiltrated layer is relatively uneven.…”