Microstructure and linear scratch test of low temperature plasma nitrided stainless steels

Abstract:

AISI 316L and AISI 410 stainless steel were low temperature plasma nitride in a hot wall DC-pulsed reactor in a mixture of 75% of nitrogen and 25% of hydrogen, during 20 hours. Microstructure and chemical composition of the nitride layers were characterized by optical and scanning electron microscopy and X-ray diffraction. Expanded austenite formed at the surface of the AISI 316L austenitic stainless steel, while expanded martensite and iron nitrides formed at the surface of the martensitic AISI 410 stainless steel. Critical loads for cracking the nitrogen supersaturated layers were determined using linear scratch test according to ASTM CI624 standard. The addition of nitrogen significantly decreased the friction coefficient of both tested materials to value below 0.1 and tensile cracking was the predominant failure mode of the nitride layers.


Reference:
ESPITIA, Luis; VARELA, Luis; TIEPPO, Gabriela; PINEDO, Carlos; BOCCALINIi JR., Mario; TSCHIPTSCHIN, André Paulo. Microstructure and linear scratch test of low temperature plasma nitrided stainless steels. In: WORLD TRIBOLOGY CONGRESS, 5., 2013, Torino, Italy. Proceedings… 4 p.

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