Authors
Mahdi Chemkhi, Delphine Retraint, Arjen Roos, Claude Garnier, Laurent Waltz, Clémence Demangel, Gwénaëlle Proust,
Title
The effect of surface mechanical attrition treatment on low temperature plasma nitriding of an austenitic stainless steel
In
Surface and Coatings Technology
Volume
221
Pages
191–195
Publisher
Elsevier
Year
2013
Indexed by
Abstract
Abstract The combined effect of superficial nanocrystallisation by SMAT (Surface Mechanical Attrition Treatment) followed by plasma nitriding on the mechanical properties of a medical grade austenitic stainless steel was studied. SMAT conditions were optimised to enhance nitrogen diffusion. Experimental observations (energy dispersive X-ray spectroscopy profiles, cross-sectional optical micrographs, phase analysis by X-ray diffraction and micro-hardness profiles) show that polishing away a very thin layer after SMAT and before nitriding significantly improves nitrogen diffusion into the substrate, yielding a 50% thicker nitrided layer. Possible causes for this improvement are discussed.
Affiliations
Offprint