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Hardening Mechanisms in Stainless Steel/Aluminum Bronze Composite Fabricated Using Electron Beam Additive Manufacturing

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Abstract

The authors investigated the features of structural-phase state of a composite based on stainless austenitic steel with addition of 25% (vol.) aluminum bronze. The composite was obtained by electron beam additive technology with simultaneous feeding of two wires. The paper considers analysis of the structural-phase state and mechanical characteristics. The contributions of various mechanisms to the composite hardening were evaluated. It was established that a multiphase structure is formed in the steel–25% bronze composite, which consists of 43.9% austenite, 32.0% ferrite and 24.2% bronze. Dispersion-hardened copper particles with 47 vol % content precipitated inside the austenite grains while only 20 vol % of the dispersion-hardening NiAl particles precipitated in the ferrite grains. Transmission electron microscopy data indicate a coherent conjugation between crystalline lattices of these dispersion hardening particles and matrix. Such a composite structure provides 50%, on average, improvement of the tensile strength compared to that of austenitic steel obtained by electron beam additive technology without the addition of aluminum bronze. It was found that the contributions of various hardening mechanisms to yield strength of austenite, ferrite and bronze amounted to 959.3, 972.7 and 408.7 MPa, respectively. Bronze grains do not make a significant contribution to increase of the yield strength of the composite, except for its increase due to dislocation hardening. The main contributions to the increase of the composite yield strength are made by austenite grains due to grain-boundary, dispersion and dislocation hardening, and by ferrite grains due to grain-boundary, solid-solution and dislocation hardening.

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ACKNOWLEDGEMENTS

The authors express their gratitude to Professor A.I. Lotkov for valuable comments on the article.

Funding

The work was performed within the framework of the state task of the Institute of Strength Physics and Materials Science, Siberian Branch of the Russian Academy of Sciences, projects FWRW-2021-0012. The research was carried out using the equipment of the Central Research Center “Nanotech” of the Institute of Strength Physics and Materials Science, Siberian Branch of the Russian Academy of Sciences.

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Authors and Affiliations

  1. Institute of Strength Physics and Materials Science, Siberian Branch of the Russian Academy of Sciences, 634055, Tomsk, Russia

    A. P. Zykova, A. O. Panfilov, A. V. Vorontsov, E. A. Kolubaev & S. Yu. Tarasov

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  1. A. P. Zykova
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  2. A. O. Panfilov
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  3. A. V. Vorontsov
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  4. E. A. Kolubaev
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  5. S. Yu. Tarasov
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Correspondence to A. P. Zykova, A. O. Panfilov, A. V. Vorontsov, E. A. Kolubaev or S. Yu. Tarasov.

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Translated by F. Baron

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Zykova, A.P., Panfilov, A.O., Vorontsov, A.V. et al. Hardening Mechanisms in Stainless Steel/Aluminum Bronze Composite Fabricated Using Electron Beam Additive Manufacturing. Steel Transl. 52, 912–919 (2022). https://doi.org/10.3103/S0967091222100163

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