Effect of Active Screen Plasma Nitriding on the Corrosion and Wear Properties of Duplex Stainless Steel

• Main Authors: Chi-An Chang, 張記銨
• Other Authors: Liu-Ho Chiu
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/4ewjbp

碩士 === 大同大學 === 材料工程學系(所) === 95 === Active screen plasma nitriding (ASPN) on the corrosion properties of UNS S31803 duplex stainless steel with different temperature and times has been studied. The surface hardness of ASPN DSS specimen was raised to 1000~1200HK. From the experimental results, the S-phase (γN) and αN phase were observed in the surface of ASPN DSS specimens conducted under 400 to 450℃, and increasing corrosion resistance at 420℃ with 10-20 hours after plasma nitriding. When working time increase to 25 hours will lose the property of corrosion resistance, and working temperature above 435℃ will also lose the property of corrosion resistance due to chromium nitride formation. The hardness of nitrided layer reach to 900HV above and increasing wear resistance obviously after plasma nitriding. Working temperature and time below 420℃ and 20 hours are the optimum treatment condition of duplex stainless steel by active screen plasma nitriding.