Surface modification of H13 steel by pulse-plasma detonation treatment
ZOU Jin1,2,FU Qing-feng1,LU De-ping1,ZHOU Zhe1,LIU Cheng-cheng3,LU Lei1
(1. Jiangxi Key Laboratory of Advanced Copper and Tungsten Materials, Nanchang 330029, Jiangxi, China 2. Shanghai Key Laboratory of Modern Metallurgy and Materials Processing, Shanghai 200444, China 3. School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, Jiangxi, China)
Abstract:Effects of pulse-plasma detonation technique on microstructure and performance of H13 steel (4Cr5MoSiV1) were studied. Base on the research of microstructure, phase structure, surface residual stress, micro-hardness and wear resistance, the mechanism of surface modification and the effect of pulse-plasma detonation technique were analyzed and discussed. The results indicate that the modified layer with uniform thickness, compact structure and high hardness is obtained on the surface of H13 steel as a result of rapid solidification and rapid quenching. Martensite is refined in the modified layer, and the residual austenite and reversed austenite are formed with different physical processes. With the increase of treatment pulses, the residual compressive stress in material surface first increases, and then decreases and finally changes to tensile stress. The thickness and micro-hardness of modified layer improves with the increase of treatment pulses, while the surface melting is intensified and the melting zone becomes thicken. The greatest enhancement of wear resistance occurs when the number of treatment pulses is 8.
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