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Cyclic Strength of the Zr–1% Nb Alloy after Equal Channel Angular Pressing

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Abstract

The effect of equal channel angular pressing (ECAP) on the structure, static, and cyclic strength of zirconium alloy E110 (Zr–1% Nb) is studied. The ECAP procedure is applied to samples with a diameter of 20 mm and a length of 100 mm along the BC route with an angle of 110° between the channels in six passes with a stepwise decrease in temperature from 400 to 300°C. A highly inhomogeneous ultrafine-grained microstructure that is comprised of regions filled with cells and fragments with low misorientation and a high density of dislocations and regions with predominantly equiaxial structural units is formed in the alloy after ECAP. As a result of ECAP, the tensile strength of the alloy increases by 40%, the yield point increases by 22%, and the relative elongation decreases by a factor of 2. Equal channel angular pressing leads to a decrease in the endurance fatigue limit based on 107 cycles from 225 to 150 MPa and to a change in the fracture mechanism from a quasi-ductile microgrooved mechanism to a predominantly brittle one with secondary cracking. With high stresses in the cycle (above 280 MPa), the durabilities of the alloy both in the initial state and after ECAP are comparable.

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Funding

The structural studies were performed using the equipment of Center for Collective Use Materials Science and Metallurgy with the financial support from the Ministry of Education and Science of Russia (project no. 075-15-2021-696).

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Authors and Affiliations

  1. National Research Technological University MISiS, 119049, Moscow, Russia

    A. B. Rozhnov, S. O. Rogachev & Khanan Alsheikh

  2. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, 119334, Moscow, Russia

    S. O. Rogachev & D. V. Prosvirnin

Authors
  1. A. B. Rozhnov
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  2. S. O. Rogachev
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  3. Khanan Alsheikh
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  4. D. V. Prosvirnin
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Correspondence to S. O. Rogachev.

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The authors declare that they have no conflicts of interest.

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Translated by O. Kadkin

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Rozhnov, A.B., Rogachev, S.O., Alsheikh, K. et al. Cyclic Strength of the Zr–1% Nb Alloy after Equal Channel Angular Pressing. Phys. Metals Metallogr. 123, 99–105 (2022). https://doi.org/10.1134/S0031918X22010112

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  • DOI: https://doi.org/10.1134/S0031918X22010112

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