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Structure and Mechanical Properties of Austenitic Stainless Steel Prepared by Selective Laser Melting

  • STRUCTURE, PHASE TRANSFORMATIONS, AND DIFFUSION
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Abstract

The microstructure and mechanical properties of chromium–nickel austenitic stainless steel fabricated by selective laser melting using a Realizer SLM100 3D printer have been investigated in this work. The structure of the studied specimens has been formed by the complete melting of the initial powder and high-speed cooling of the melt. Cooling of the melt initially leads to the formation of δ ferrite, and then, polymorphic δ → γ transformation results in the formation of the final austenitic structure. The structure of δ ferrite which formed during melt crystallization has been found to exhibit a clear pattern of periodicity. The periodicity depends on the parameters of the melting process, such as the distance between neighboring bands formed during laser-beam traveling (intertrack distance) and the step of platform feeding (distance between layers). The polymorphic δ → γ transformation takes place by a disordered mechanism and no austenite texture forms. However, some structural heredity remains. It can be seen in the orientational relationship between some austenite grains and δ-ferrite grains. The steel fabricated by laser melting is shown to have high mechanical properties such as the yield strength, the ultimate tensile strength, and the tensile elongation at a strain rate of 10–2 s–1, which are 320, 765 MPa, and 50%, respectively. The yield strength and ultimate tensile strength of the specimens under dynamic compression by the Hopkinson–Kolskii technique at an average strain rate of 103 s–1 are 550 and 945 MPa, respectively.

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ACKNOWLEDGMENTS

The electron microscopic studies were performed at the Center of the Collaborative Access “Test Center of Nanotechnologies and Advanced Materials,” Institute of Metal Physics, Ural Branch, Russian Academy of Sciences.

Funding

This work was performed within the State Program (theme “Structure,” No. АААА-А18-118020190116-6).

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Authors and Affiliations

  1. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, 620990, Ekaterinburg, Russia

    V. I. Zel’dovich, I. V. Khomshaya, N. Yu. Frolova, A. E. Kheifets & D. N. Abdullina

  2. Russian Federal Nuclear Center–Zababakhin All-Russian Scientific Research Institute of Technical Physics, 456770, Snezhinsk, Chelyabinsk oblast, Russia

    E. A. Petukhov, E. B. Smirnov, E. V. Shorokhov, A. I. Klenov & A. A. Pil’shchikov

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  1. V. I. Zel’dovich
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  2. I. V. Khomshaya
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  3. N. Yu. Frolova
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  4. A. E. Kheifets
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  5. D. N. Abdullina
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  6. E. A. Petukhov
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  7. E. B. Smirnov
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  8. E. V. Shorokhov
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  9. A. I. Klenov
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  10. A. A. Pil’shchikov
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Correspondence to V. I. Zel’dovich.

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Translated by T. Gapontseva

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Zel’dovich, V.I., Khomshaya, I.V., Frolova, N.Y. et al. Structure and Mechanical Properties of Austenitic Stainless Steel Prepared by Selective Laser Melting. Phys. Metals Metallogr. 122, 491–497 (2021). https://doi.org/10.1134/S0031918X21050136

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  • DOI: https://doi.org/10.1134/S0031918X21050136

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