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Regularities of Oxidation and Decarburization of Special Alloy Steels in the BCC→FCC Phase Transformation Temperature Range

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Regularities of oxidation and decarburization of special alloy steels 12KhN, 30G1R, 35KhGSA, 40Kh, and 62S2KhA in the temperature range 800–950°C of their phase transformation from ferrite to austenite are investigated. It is established that for all steels there is a general regularity in steady growth of lost metal layer thickness as a result of oxidation with an increase in heating duration and temperature. For special alloy steels, the depth of the decarburized zone decreases (possibly, with a subsequent increase) with an increase in isothermal aging temperature and transition from zones for ferrite existence into austenite. Superposition of these two processes leads to an increase in decarburized zone depth on holding steel in the temperature range of the presence of ferrite. Therefore, in order to prevent the occurrence of decarburized zones that have an unfavorable effect on cold upsetting capacity for round bars, it is expedient to accelerate special alloy steel billet heating to a temperature near 900–950°C.

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References

  1. A. B. Stepanov, N. A. Arutyunyan, Yu. I. Ivin, and A. I. Zaitsev, “Effect of microstructure and surface defects on the capacity of special alloy steel round bar for cold upsetting,” Metallurgist, 60, No. 7, 713–720 (2016).

  2. A. I. Zaitsev, I. G. Rodionova, A. A. Pavlov, et al., “Effect of composition, structural state, and manufacturing technology on service properties of high-strength low-carbon steel main bimetal layer,” Metallurgist, 59, No. 7, 684–692 (2015).

  3. A. A. Komissarov, Structure and Mechanical Properties of Steels after Treatment at Sub-Critical Temperatures: Auth. Abstr. Diss. Cand. Techn. Sci.: 15.16.01, (2013), Moscow.

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Authors and Affiliations

  1. Bardin Central Research Institute of Ferrous Metallurgy (TsNIIchermet), Moscow, Russia

    A. B. Stepanov & A. V. Knyazev

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  1. A. B. Stepanov
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  2. A. V. Knyazev
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Correspondence to A. B. Stepanov.

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Translated from Metallurg, No. 7, pp. 61–65, July, 2017.

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Stepanov, A.B., Knyazev, A.V. Regularities of Oxidation and Decarburization of Special Alloy Steels in the BCC→FCC Phase Transformation Temperature Range. Metallurgist 61, 574–578 (2017). https://doi.org/10.1007/s11015-017-0535-4

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  • DOI: https://doi.org/10.1007/s11015-017-0535-4

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