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자료유형
학술저널
저자정보
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한국표면공학회 한국표면공학회지 한국표면공학회지 제38권 제5호
발행연도
2005.10
수록면
202 - 206 (5page)

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Nitriding treatments were conducted on tool steel (SKD 61) at a temperature of 500°C for 5 hr using high vacuum direct current (DC) plasma, with ammonia and argon as source gases. The structural and com-positional changes produced in the nitrided layers by applying different ratios of Ar to NH₃ (n<SUB>Ar</SUB>/n<SUB>NH3</SUB>) were investigated using glancing x-ray diffraction (GXRD), optical microscopy, atomic force microscopy (AFM), micro-Vickers hardness testing, and pin-on-disc type tribometer. Nitriding case depths of around of 50 ㎛ were produced, varying slightly with different ratios of n<SUB>Ar</SUB>/n<SUB>NH3</SUB>. It was found that the specimen surface hardness was 1150 Hv with n<SUB>Ar</SUB>/n<SUB>NH3</SUB>=1, increasing to a maximum value of 1500 Hv with n<SUB>Ar</SUB>/n<SUB>NH3</SUB>=5. With a further increase in ratio to nAr/nNH3=10, the surface hardness of the specimen reduced slightly to a value of 1370 Hv. These phenomena were caused by changes of the crystallographic structure of the nitride layers, i.e the γ'-Fe₄N phase only was observed in the sample treated with n<SUB>Ar</SUB>/n<SUB>NH3</SUB>=1, and the intensity of the γ'-Fe₄N phase were reduced but new phase of ε'-Fe₃N, which was known as a high hardness, with increasing n<SUB>Ar</SUB>/n<SUB>NH3</SUB>. Also, the relative weight loss of counterface of the pin-an-disc with unnitrided steel was 0.2. And that of nitrided steel at a gas mixture (n<SUB>Ar</SUB>/n<SUB>NH3</SUB>) of 1, 5, 7, and 10 was 0.4, 0.7, 0.6, and 0.5 ㎎, respectively. This means that the wear resistance of the nitrided samples could be increased by a factor of 2 at least than that of unnitrided steel.

목차

Abstract
1. Introduction
2. Experimental Procedure
3. Results and Discussion
4. Conclusions
References

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