Abstract
The plasma arc cladding process with Fe-based powder-cored wire used to efficiently clad tungsten carbide (WC)-reinforced Fe-based layers on stainless steel is proposed. WC-Fe compound cladding layers on stainless steel were deposited with Fe-based powder-cored wire containing 10%, 20%, 30% or 45% WC particles. Then the macroscopic morphology, microstructure, microhardness and wear performance were characterized in detail. The cladding layers were mainly composed of austenite, but with the increasing WC content, the microstructure of the cladding layers become finer, and α-Fe, Fe3C, Cr7C3, Fe3W3C and residual WC contents gradually rose. The addition of WC can significantly refine the grain size. The low-angle boundary content increased from 14.47% to 71.92%, and the average grain size decreased by 50% from 63.2 to 31.6 µm, which resulted in a significant increase in the hardness and wear resistance of the cladding layers. The average microhardness rose by 38% from 349.0 to 482.1 HV. The wear resistance improved significantly.
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