Steel AISI4140 is studied after plasma nitriding and preliminary oxidation. The structure of the preliminarily oxidized surfaces after the nitriding is studied by scanning electron microscopy (SEM). The free surface energy is computed from the results of the measurement of the angle of contact between a liquid drop and the surface studied. The thickness of the nitrided layer is determined. The phase transformations on the surface are considered. The effect of oxidation conducted prior to nitriding is shown to be positive. The optimum oxidation mode (300°C, 30 min) for improving the structure of the nitrided layer and more than doubling its thickness is chosen.
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The study has been supported by the National Natural Science Foundation of China (51774052), Top-notch Academic Programs Project of Jiangsu Higher Education Institutions (TAPP) and Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD2014-6).
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Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 3, pp. 44 – 49, March, 2020.
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Tang, L., Zhao, X., Li, J. et al. Effect of Pre-Oxidation on Plasma Nitrided Steel AISI4140. Met Sci Heat Treat 62, 224–228 (2020). https://doi.org/10.1007/s11041-020-00539-8
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DOI: https://doi.org/10.1007/s11041-020-00539-8