Microstructure and Tribological Properties of the Plasma Carburized Layer on Ti_2AlNb Alloy Surface AITranslate

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Chinese Library Classification Number:TG146.41[金属学及工艺—金属材料]

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Ti2AlNb alloy was modified by double glow plasma surface carburizing to improve its wear resistance.The microstructure,phase composition and dynamic microhardness of the carburized layer was characterized through SEM,XRD and dynamic microhardness system.And its wear resistance was tested through a HT2500-type friction and wear tester.The results show that about 11 μm carburized layer is obtained on the Ti2AlNb alloy surface,and its carbon content decreases gradually from surface to matrix.The main components of the carburized layer are pure C,TiC and Ti2AlC.The surface dynamic microhardness of the carburized layer is 9.61 GPa.The specific wear rate of the carburized sample is only 1.82% of the matrix alloy.The wear resistance of Ti2AlNb alloy is greatly increased by carburization.