발간논문

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Vol.45, No.12, 669 ~ 673, 2007
Title
The Influence of Ar Gas Addition in the Low Temperature Plasma Carburizing Treatment of AISI304L Stainless Steel
정광호 Kwang Ho Jeong , 이인섭 In Sup Lee
Abstract
A low temperature plasma carburizing technique offers the enhancement of surface hardness of austenitic stainless steels without sacrificing their corrosion resistance. However, it is hard to obtain the reliable thickness of hardened layer due to the sufficiently low process temperature. In the present paper, attempts have been made to investigate the influence of the addition of Ar gas (0~30%) in the carburizing atmosphere during plasma carburizing. The expanded austenite (γc) and precipitates of chromium carbides were detected in the hardened layer (C-enriched layer). The precipitation of chromium carbides formed at the grain boundaries led to the degradation in the corrosion resistance. The introduction of the reasonable amount of Ar into the atmosphere can contribute to the increase of the thickness of the hardened layer. The surface hardness was determined to be in a range between 250 and 750 Hv0.l. The thickness of the hardened layer was increased up to about 30 μm in 30% Ar atmosphere.
Key Words
austenitic stainless steel, Low temperature plasma carburzing, expanded austenite
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