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Glow discharge plasma nitriding of AISI 304 austenitic stainless steel has been car-ried out for different processing time under optimum discharge conditions established by spectro-scopic analysis.The treated samples were analysed by X-ray diffraction(XRD)to explore thechanges induced in the crystallographic structure.The XRD pattern confirmed the formation ofan expanded austenite phase(γN)owing to incorporation of nitrogen as an interstitial solid solu-tion in the iron lattice.A Vickers microhardness tester was used to evaluate the surface hardnessas a function of indentation depth(μm).The results showed clear evidence of surface changeswith substantial increase in surface hardness.
Glow discharge plasma nitriding of AISI 304 austenitic stainless steel has been car-ried out for different processing time under optimum discharge conditions established by spectro-scopic analysis. The treated samples were analysed by X-ray diffraction (XRD) to explore the changes in induced in the crystallographic structure. The XRD pattern confirmed the formation of an expanded austenite phase (γN) owing to incorporation of nitrogen as an interstitial solid solu-tion in the iron lattice. A Vickers microhardness tester was used to evaluate the surface hardness as a function of indentation depth ( μm). The results showed clear evidence of surface changes with substantial increase in surface hardness.