Abstract
A Ni–Al–Cr 3C 2 welding wire was produced by metal–powder–core technique. When the welding wires were welded on the surface of carbon steel, under the effect of the physical heat of arc, Ni reacted with Al to form Ni 3Al and carbide particles reinforced Ni 3Al matrix composite was formed. Cr 3C 2 was decomposed during welding and dispersed Cr 7C 3 with stripe shape formed, which strengthened the matrix significantly. The Cr 7C 3–Ni 3Al interface has broadened into a zone of interdiffusion and a new phase M 23C 6, which indicates that a good bond has been formed. The pin-abrasion wear test showed that the abrasion resistance of Cr 7C 3/Ni 3Al composite is six times higher than that of Stellite12 alloy at room temperature. The good wear resistance of Cr 7C 3/Ni 3Al composite coating can be attributed to large volume fraction of carbides, high hardness, and good phases interface bond.
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