Browsing by Keyword "Plasma treatment"
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Item Microstructure and wear behavior of DC-pulsed plasma nitrided AISI 316L austenitic stainless steel(2007) De Las Heras, Evangelina; Santamaria, Daniel González; García-Luis, Alberto; Cabo, Amado; Brizuela, Marta; Ybarra, Gabriel; Mingolo, Norma; Brühl, Sonia; Corengia, Pablo; TECNOLOGÍAS DE HIDRÓGENO; INGENIERÍA DE SUPERFICIES; GENERALAustenitic stainless steel are used in industrial applications, mainly due to their good corrosion resistance; however, their low hardness and poor wear performance impose strong limitations in many cases. In this work, the wear behavior of the unnitrided and DC-pulsed plasma nitrided AISI 316L stainless steel has been investigated using an Amsler-Disc-Machine under rolling-sliding contact conditions. The microstructure was studied by X-ray diffraction and the worn surface, subsurface, and wear debris were analyzed by optical microscopy, scanning electron microscopy, and microhardness testing. The obtained results show that pulsed plasma nitriding improves the wear resistance of the AISI 316L and different wear mechanisms were observed depending on the normal applied load.Item Wear behaviour of UHMWPE against DC-pulsed plasma nitrided and duplex treated AISI 316L used in hip joint replacements(2009) Perez, Ezequiel; Pazos, Leonardo; De Heras, Evangelina Las; Parodi, Belén; Corengia, Pablo; Braceras, Iñigo; GENERAL; INGENIERÍA DE SUPERFICIESWear behaviour of the artificial joint replacements plays a critical role in implant failure. The UHMWPE-AISI 316L tribological system, widely used on joint prostheses, was studied. Two surface modifications were applied to the stainless steel counterface: DC-pulsed plasma nitriding and duplex (DC-pulsed plasma nitriding + TiN coating by cathodic-arc evaporation) treatments. An Amsler Disc Machine Type A-135 was used as an approximation to real loading conditions. Worn surfaces, weight loss curves and wear debris were analysed. The results show that the nitriding and duplex treatments improve the wear resistance of the tribological system. Different types of damages were observed on the UHMWPE worn surfaces depending on the surface treatment of the stainless steel.