Journal
MATERIA-RIO DE JANEIRO
Volume 13, Issue 2, Pages 342-347Publisher
UNIV FED RIO DE JANEIRO, LAB HIDROGENIO
DOI: 10.1590/S1517-70762008000200012
Keywords
plasma nitriding; carburizing; martensitic steel; hardness; cathodic cage nitriding
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AISI 420 martensitic stainless steel samples were nitrided by cathodic cage technique with addition of methane in the atmosphere aiming to reduce chromium nitride precipitation, to increase hardness and wear resistance without the presence of characteristic defects inherent to the ionic nitriding process. Microhardness measurements and X-ray analysis confirm the formation of a high hardness double-layer constituted by two regions: one internal region composed of carbon and another composed of nitrogen.
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