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Effect of laser quenching and subsequent heat treatment on the structure and wear resistance of a cemented steel 20KhN3A

  • Strength and Plasticity
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Abstract

The martensite-austenite structures that are formed under the action of continuous laser irradiation in the 20KhN3A steel subjected to various regimes of cementation have been studied by metallography, electron microscopy, and X-ray diffraction. It has been established that a decrease in the amount of retained austenite in the laser-quenched structures from 40–90 to 5–35 vol % resulted from cold treatment at −196°C exerts only a small (within 10%) effect on the abrasive wear resistance of the cemented steel; the effect is negative upon microcutting and positive upon microscratching. An increase in the carbon concentration from 0.8 to 1.2 wt % in the martensite-austenite structures that are formed in the cemented steel under the action of laser irradiation and upon cold treatment leads to changes in the abrasive wear resistance by no more than 10–13%. The presence of 20–40 vol % metastable retained austenite retards the decrease in the abrasive wear resistance of the quenched steel upon subsequent low-temperature tempering. It has been shown that the laser quenching and additional cold treatment positively affect the resistance of rolling bearing units of drill bits to contact-fatigue fracture.

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Authors and Affiliations

  1. Institute of Machine Science, Ural Division, Russian Academy of Sciences, ul. Komsomol’skaya 34, Ekaterinburg, 620219, Russia

    A. V. Makarov, I. Yu. Malygina & A. L. Osintseva

  2. Institute of Metal Physics, Ural Division, Russian Academy of Sciences, ul. S. Kovalevskoi 18, Ekaterinburg, 620041, Russia

    L. G. Korshunov

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  1. A. V. Makarov
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  2. L. G. Korshunov
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  3. I. Yu. Malygina
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  4. A. L. Osintseva
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Original Russian Text © A.V. Makarov, L.G. Korshunov, I.Yu. Malygina, A.L. Osintseva, 2007, published in Fizika Metallov i Metallovedenie, 2007, Vol. 103, No. 5, pp. 536–548.

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Makarov, A.V., Korshunov, L.G., Malygina, I.Y. et al. Effect of laser quenching and subsequent heat treatment on the structure and wear resistance of a cemented steel 20KhN3A. Phys. Metals Metallogr. 103, 507–518 (2007). https://doi.org/10.1134/S0031918X07050110

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  • DOI: https://doi.org/10.1134/S0031918X07050110

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