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Ti-6Al-4V(TC4) alloys were plasma carbonized at different temperatures(900, 950, and 1 000 ℃) for duration of 3 h. Graphite rod was employed as carbon supplier to avoid the hydrogen brittleness which is ubiquitous in traditional gas carbonizing process. Two distinguished structures including a thin compound layer(carbides layer) and a thick layer with the mixed microstructure of Ti C and the α-Ti in carburing layer were formed during carburizing. Furthermore, it was found that the microstructure and the properties of TC4 alloy were signifi cantly related to the carbonizing temperature. The specimen plasma carbonized at 950 ℃ obtained maximum value both in the hardness and wear resistance.
Ti-6Al-4V (TC4) alloys were plasma carbonized at different temperatures (900, 950, and 1000 ° C) for duration of 3 h. Graphite rod was employed as carbon supplier to avoid the hydrogen brittleness which is ubiquitous in traditional gas carbonizing process. Two distinguished structures including a thin compound layer (carbides layer) and a thick layer with the mixed microstructure of Ti C and the α-Ti in carburing layer were carburizing. Furthermore, it was found that the microstructure and the properties of TC4 alloy were signifi cantly related to the carbonizing temperature. The specimen plasma carbonized at 950 ℃ obtained maximum value both in the hardness and wear resistance.