No.5（2002）6.Synthesis of Fe2W by low-pressure laser spraying

Yoji ISSHIKI

Fe₂W is the Laves type intermetallic compound with hexagonal crystal structure and is known to be a kind of hard alloy. The low-pressure laser spraying (LPLS) method was applied to synthesize Fe₂W clad layers on a mild steel substrate. Structure and atomic composition of surface clad layers were analyzed by X-ray diffraction and energy dispersive X-ray spectroscopy respectively. When the substrate was exposed to a laser energy density of 36 W/mm², the tungsten concentration of clad layers was estimated at 20 mass %, maximum, with a microhardness of 240 HV. The microhardeness increased remarkably with heat treatment at 973K in a vacuum, suggesting that the Fe₂W phase was formed with heat treatment.

Keywords
Laser surface modification, Hard coating, Fe₂W

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