내식성 및 표면경도 향상을 위한 AISI 304L 스테인리스강의 저온 플라즈마질화 프로세스

• Published in: 대한금속·재료학회지, 47(10) pp. 629 - 634
• Main Author: 이인섭
• Format: Journal Article
• Language: Korean
• Published: 대한금속·재료학회 01.10.2009
• Subjects: 재료공학
• ISSN: 1738-8228; 2288-8241

The effects of processing parameters on the surface properties of the hardened layers processed by both the low temperature plasma nitrocarburizing and the low temperature two-step plama treatment (carburizing+nitriding) were investigated. The nitrogen-enriched expanded austenite structure (γN) or S phase was formed on all of the treated surface. The surface hardness reached up to 1200 HV0.025, which is about 5 times higher than that of untreated sample (250 HV0.1). The thickness of hardened layer of the low temperature plasma nitrocarburized layer treated at 400℃ for 40 hour was only 15 μm, while the layer thicknesss in the two-step plama treatment for the 30 hour treatment increased up to about 30 μm. The surface thickness and hardness increased with increasing treatment temperature and time. In addition, the corrosion resistance was enhanced than untreated samples due to a high concentration of N on the surface. However, higher treatment temperature and longer treatment time resulted in the formation of Cr2N precipitates, which causes the degradation of corrosion resistance. KCI Citation Count: 7