Conclusions
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1.
Among the materials investigated the pitting formation process takes place most intensely in the M2 plasma coating. The resistance of the PG-SR4 coating to contact-fatigue failure is at the level of a similar characteristic of U8 steel with bainite structure after isothermal processing.
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2.
The controllable thermoplastic hardening of the U8 steel with subsequent treatment to bainite results in an increase in its fracture toughness, increases the resistance to contact-fatigue failure in comparison with normal isothermal processing.
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3.
For increasing the resistance to contact-fatigue of protective coatings, it is necessary to reduce their porosity, increase their cohesion strength and the strength of bonds with the base metal.
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Literature cited
L. I. Tushinskii, A. O. Tokarev, and V. S. Vlasov, "Formation of optimum structure and structural strength of carbon steel by adjustable thermoplastic treatment", in: New Methods of Hardening and Treatment of Metals [in Russian], nÉTI, Novosibirsk (1979), pp. 3–10.
V. S. Vlasov, A. A. Bataev, and B. M. Potapov, "Adjustable thermoplastic hardening of carbon steels", in: Structures of Volume- and Surface-Hardened Steel [in Russian], NÉTI, Novosibirsk (1984), pp. 69–73.
V. M. Potapov and E. N. Mironov, "Mechanical properties of the U8 steel with bainite structure after ATPH", in: Optimum Structure of Steel for Increasing the Structural Strength [in Russian], NÉTI, Novosibirsk (1983), pp. 15–23.
Additional information
Novosibirsk Electrotechnical Institute. Novosibirsk State Pedagogical Institute, NPO "Tulachermet," Translated from Metallovedenie Termicheskaya Obrabotka Metallov, No. 5, pp. 36–38, May, 1988.
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Tushinskii, L.I., Bataev, V.A., Potapov, V.M. et al. Life of hardened materials under the conditions of contact load. Met Sci Heat Treat 30, 363–365 (1988). https://doi.org/10.1007/BF00701047
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DOI: https://doi.org/10.1007/BF00701047