Microstructures of Surface Alloyed Carbon Steel Fabricated by Ferrous-Tungsten and Carbon Powders
A surface alloyed process that adopted ferrous-tungsten and carbon powders as reactants to in-suite synthesize WC reinforcement particles with the assistance of molten carbon steel was attempted in this paper. Results showed that the surface alloyed layer is dense and there are no obvious defects. Microstructures from surface to core are consisted of three different layers, i.e., the top surface alloyed layer, the interim transitional layer and the bottom matrix steel. There are no any WC particles formed in the surface alloyed layer which is consisted of dendrite matrix and inter-dendritical net eutectics and carbides. The net carbides have two types: one is WC or W2C; the other is M7C3. Few large metal tungsten particles are distributed at part bottom of the surface alloyed layer. The microstructure in the transitional layer is consisted of large amounts of pearlites and certain amounts of net carbides.
Jianmin Zeng, Hongxi Zhu and Jianyi Kong
C. Q. Guo, "Microstructures of Surface Alloyed Carbon Steel Fabricated by Ferrous-Tungsten and Carbon Powders", Advanced Materials Research, Vols. 634-638, pp. 3038-3043, 2013