Morphological transition of martensite as related to Ni content in a Fe-5%Ni/Fe-10%Ni diffusion couple

A diffusion couple composed of Fe-5%Ni and Fe-10%Ni alloys was carburized in a salt bath to 0.8%C through the entire thickness. The samples had a smooth Ni gradient ranging from 5 to 10% Ni. Samples were carburized at 900 degree C, and cooled in oil. A morphological transition in martensite and an i...

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Published inTecnologia em Metalurgia, Materiais e Mineracao Vol. 20110718; pp. 1805 - 1813
Main Authors De Monlevade, Eduardo Franco, Pinedo, Carlos Eduardo, Goldenstein, Helio
Format Journal Article
LanguageEnglish
Published 01.01.2011
Subjects
Carburizing
Diffusion
Ferrous alloys
Iron
Martensite
Morphology
Nickel
Retained austenite
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Summary:A diffusion couple composed of Fe-5%Ni and Fe-10%Ni alloys was carburized in a salt bath to 0.8%C through the entire thickness. The samples had a smooth Ni gradient ranging from 5 to 10% Ni. Samples were carburized at 900 degree C, and cooled in oil. A morphological transition in martensite and an increase in the volume fraction of retained austenite are clearly visible as the Nickel content rises towards 10%. Grain boundary formation of bainite is also visible in the lower Nickel content regions. The formation of bainita ceases at an approximate Nickel content of 6.5%, and the scale transition of martensite (from very fine plate to large plate morphology) is more pronounced shortly afterwards, at approximately 7% Ni. An increase in the amount of retained austenite is also present as the nickel content increases, and the beginning of its appearance seems to be closely related to the change in martensite morphology.
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ISSN:2176-1515