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Vol.38, No.2, 332 ~ 338, 2000
Title
Pesearch Paper / Surface Treatment : Cyclic Oxidation Behavior of Alloys Treated by Park Cementation and Ion Nitriding
양준혁Joon Hyuk Yang,이상율Sang Yul Lee
Abstract
In order to improve wear resistance and oxidation resistance simultaneously, the duplex-treatment of pack cementation coating and plasma nitriding was performed on AISI H13 steel and STS 403 steel. Cyclic oxidation test at 900℃ was performed and the oxidation behaviors of the duplex-treated specimens was compared with those of plasma nitrided specimens in terms of microstructure through SEM/EDS and weight change as a function of oxidation cycles. Special attention was paid to the effect of the single element (Al only) or multi-element (Al + Cr) diffusion coating on the oxidation behavior of the duplex treated specimens layer. Based upon the results from cyclic oxidation test performed at 900℃, the specimens treated by plasma nitriding only showed a destruction of nitrided layer after 20 cycles and rapid oxidation of the substrate. While both types of duplex-treated specimens showed a much better oxidation resistance than the plasma nitrided specimen, still better oxidation resistance could be observed from the specimen treated by multi-element (Al + Cr) diffusion coating and plasma nitriding than the specimen treated by single-element (Al) diffusion coating and plasma nitriding. This could be attributed to the fact that improved oxidation resistance was provided by forming a Cr₂O₃ layer as an additional protective layer on the surface of the multi-element duplex-treated specimen.
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