Effect of a plated Fe-Cr-Ni alloy layer for rapid nitriding of invar |
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Authors: | K. Gemma M. Kawakami H. Ueda C. Mihara |
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Affiliation: | (1) Department of Materials Science, Tokai University, 1117 Kitakaname, Hiratsuka-shi, 259-12 Kanagawa-ken, Japan |
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Abstract: | The nitriding rate in a plated invar with an Fe-Ni-Cr alloy (face-centred cubic) layer were compared by optical microscopy with the rate in an unplated invar. In the plated invar rapid nitrogen diffusion was discovered. The plated layer plays a role in enhancing the nitriding rate. The result gives a solution for an abnormal enhancement nitriding rate in austenitic stainless steels. The enhancement is explained from the viewpoint of non-equilibrium thermodynamics. |
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