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http://dx.doi.org/10.3740/MRSK.2002.12.6.447

Effects of Nitrogen Gas Ratio on Nitride Layer and Microhardness of Tool Steel(SKH51) in Plasma Nitriding  

Kim, Deok-Jae (Institute for Advanced Engineering)
Lee, Hae-Ryong (Institute for Advanced Engineering)
Gwak, Jong-Gu (Korea Atomic Energy Research Institute)
Jeong, U-Chang (Dept.of Metallurgical Engineering, Busan National University)
Jo, Yeong-Rae (Dept.of Metallurgical Engineering, Busan National University)
Publication Information
Korean Journal of Materials Research / v.12, no.6, 2002 , pp. 447-451 More about this Journal
Abstract
Pulsed DC-plasma nitriding has been applied to form nitride layer having only a diffusion layer. The discharge current with the variation of discharge gases is proportional to the intensity of $N_2^+$ peak in optical emission spectroscopy during the plasma nitriding. The discharge current, microhardness in surface of substrate and depth of nitride layer increased with the ratio of $N_2\;to\;H_2$ gas in discharge gases. When the ratio of $N_2\;to\;H_2$ is lower than 60% in the discharge gases, high microhardness value of 1100Hv nitride layer which contains no compound layer has been formed.
Keywords
plasma nitriding; compound layer; diffusion layer; nitride layer;
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