Abstract

SOUSA, Rômulo Ribeiro Magalhães de et al. Cathodic cage nitriding of AISI 409 ferritic stainless steel with the addition of CH₄. Mat. Res. [online]. 2012, vol.15, n.2, pp. 260-265.  Epub Feb 24, 2012. ISSN 1516-1439.  http://dx.doi.org/10.1590/S1516-14392012005000016.

AISI 409 ferritic stainless steel samples were nitrided using the cathodic cage plasma nitriding technique (CCPN), with the addition of methane to reduce chromium precipitation, increase hardness and wear resistance and reduce the presence of nitrides when compared to plasma carbonitriding. Microhardness profiles and X-Ray analysis confirm the formation of a very hard layer containing mainly ε-Fe₃N and expanded ferrite phases.

Keywords : cathodic cage; plasma carburizing; ferritic stainless steel.