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Structure formation in grade 20 steel during equal-channel angular pressing and subsequent heating

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Abstract

The structure formation and the mechanical properties of quenched and tempered grade 20 steel after equal-channel angular pressing (ECAP) at various true strains and 400°C are studied. Electron microscopy analysis after ECAP shows a partially submicrocrystalline and partially subgrain structure with a structural element size of 340–375 nm. The structural element size depends on the region in which the elements are formed (polyhedral ferrite, needle-shaped ferrite, tempered martensite, and pearlite). Heating of the steel after ECAP at 400 and 450°C increases the fraction of high-angle boundaries and the structural ferrite element size to 360–450 nm. The fragmentation and spheroidization of cementite lamellae of pearlite and subgrain coalescence in the regions of needle-shaped ferrite and tempered martensite take place at a high ECAP true strain and heating temperature. Structural refinement ensures considerable strengthening, namely, UTS 742–871 MPa at EL 11–15.3%. The strength slightly increases, whereas the plasticity slightly decreases when the true strain increases during ECAP. After ECAP and heating, the strength and plastic properties of the grade 20 steel remain almost the same.

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Authors and Affiliations

  1. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Moscow, 119991, Russia

    S. V. Dobatkin, M. R. Tyutin & O. V. Rybalchenko

  2. Laboratory of Hybrid Nanostructured Materials, National University of Science and Technology MISiS, Moscow, 119049, Russia

    S. V. Dobatkin & O. V. Rybalchenko

  3. Kucherenko Central Research Institute for Structural Construction, Moscow, 109428, Russia

    P. D. Odesskii

  4. Institute for Physics of Advanced Materials, Ufa State Aviation Technical University, Ufa, 450000, Russia

    G. I. Raab

Authors
  1. S. V. Dobatkin
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  2. P. D. Odesskii
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  3. G. I. Raab
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  4. M. R. Tyutin
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  5. O. V. Rybalchenko
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Correspondence to S. V. Dobatkin.

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Original Russian Text © S.V. Dobatkin, P.D. Odesskii, G.I. Raab, M.R. Tyutin, O.V. Rybalchenko, 2016, published in Metally, 2016, No. 6, pp. 11–20.

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Dobatkin, S.V., Odesskii, P.D., Raab, G.I. et al. Structure formation in grade 20 steel during equal-channel angular pressing and subsequent heating. Russ. Metall. 2016, 1012–1020 (2016). https://doi.org/10.1134/S0036029516110069

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  • DOI: https://doi.org/10.1134/S0036029516110069

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