V. R. Baraz, E. A. Ishina, E. A. Yurchenkov

A STATISTICAL METHOD FOR DETERMINING THE MODE OF ION-PLASMA NITRIDING

Mathematical planning is used in order to determine the optimal mode for ion nitriding of the 38Cr2Ni2Mo structural steel. This is justified by the requirement to preserve strictly limited functional parameters obtained as a result of diffusion saturation: hardness ranging between 450 and 650 HV in a 0.15–0.40-mm-deep layer. The implementation of factor planning and the regression processing of the obtained data enable us to arrive at an analytical expression in the form of a linear function for the studied optimization parameters (microhardness and layer depth). This makes it possible to assess the degree and direction of the influence of the factors under study on the optimization parameters of interest.

References:

1. Filippov, M.A., Kositsyna, I.I., and Gervasyev, M.A. Poverkhnostnaya obrabotka i pokrytiya v mashinostroenii [Surface Treatment and Coatings in Mechanical Engineering]. USTU–UPI Publ., Ekaterinburg, 2009, 212 p. (In Russian).
2. Goncharenko, I.A., Zolotukhin, V.I., and Gvozdev, A.E. Osnovy tekhnologii termicheskoy obrabotki stali [Fundamentals of Heat Treatment Technology for Steel]. Grif i K. Publ, Tula, 2006, 326 p. (In Russian).
3. Ramazanov, K.N., Agzamov, R.D., Budilov, V.V., Vafin R., and Khusainov Yu. Ionnoye azotirovanie staley v tleyushchem razryade nizkogo davleniya [Ion Nitriding of Steels in a Low-Pressure Glow Discharge]. Innovatsionnoe Mashinostroenie Publ., Moscow, 2016, 335 p. (In Russian).
4. Lakhtin, Yu.M., Kogan, Ya.D., Shpis, G., and Bemer Z. Teoriya i tekhnologiya azotirovaniya [Nitriding Theory and Technology]. Metallurgiya Publ, Moscow, 1991, 320 p. (In Russian).
5. Petrova, L.G. Internal nitriding of high-temperature steels and alloys. Metal Science and Heat Treatment, 2001, 43 (1–2), 11–17. DOI: 10.1023/A:1010405819435.
6. Available at: https://www.spectroscopyonline.com/view/international-centre-diffraction-data (accessed at: 2016).
7. Babin, A.V. and Rakipov, D.F. Organizatsiya i matematicheskoe planirovanie eksperimenta [Organization and Mathematical Planning of the Experiment: Study Guide]. UrFU Publ, Ekaterinburg, 2014, 112 p. (In Russian).
8. Adler, Yu.P., Markova, E.V., and Granovsky, Yu.V. Planirovaniye eksperimenta pri poiske optimalnykh usloviy [Planning an Experiment When Searching for Optimal Conditions]. Nauka Publ, Moscow, 1976, 279 p. (In Russian).
9. Lakhtin Yu.M. and Arzamasov B.N. Khimiko-termicheskaya obrabotka metallov [Chemical and Heat Treatment of Metals]. Moscow, Metallurgiya Publ, 1985, 255 p. (In Russian).
10. Lobanov, M.L. and Zorina, M.A. Metody opredeleniya koeffitsientov diffuzii [Methods for Determining Diffusion Coefficients: Study Guide]. Izdatelstvo Uralskogo Universiteta Publ., Ekaterinburg, 2017, 100 p. (In Russian).
11. Merer H. Diffuziya v tverdykh telakh [Diffusion in Solids]. Dolgoprudnyi, Intellect Publ, 2011, 535 p. (In Russian).

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