MICROSTRUCTURE OF THE CLAD LAYER OF CHROMIUM ON TO MILD-STEEL BY LOW-PRESSURE LASER SPRAYING

The microstructure of the clad layer of chromium on to a mild steel ob tained by low-pressure laser spraying (LPLS) is investigated by cross- sectional electron microscopy (XTEM). When impinged energy density E-i on the substrate is selected to be 64 W mm(-2) the clad layer consist s of a Cr30Fe70 alloy with a layer-by-layer structure. The thickness o f the first sub-layer is 3-7 mu m. The crystalline orientation of one sub-layer is markedly different from another, but sub-layers smoothly contact each other. One sub-layer is presumably deposited by one pass of laser spraying. (C) 1998 Elsevier Science S.A.