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Effect of Thermal Aging for up to 22 Thousand Hours on the Structural and Phase State of Ferritic–Martensitic Steels EK181 and ChS139

  • STRUCTURE, PHASE TRANSFORMATIONS, AND DIFFUSION
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Abstract

The results of structural studies of ferritic–martensitic steels EK181 (Fe–12Cr–W–V–Ta–B–C) and ChS139 (Fe–12Cr–Ni–Mo–W–Nb–V–B–N–C) after aging at temperatures of 450, 550, 650, and 700°C for a period of 1000–22 000 h are presented. Optical and electron microscopy are used in the study. The following common trends are revealed for both steels: aging for up to 19 000 h at 450 and 550°C is characterized by a low rate of decomposition of the supersaturated solid solution and by the preservation of the structural parameters of the studied steels at the initial level; aging at 650 and 700°C initiates, starting from an exposure time of 1000 h, the softening processes accompanied by the formation of a subgrain structure and coagulation of carbides. The precipitation of the Fe2(Mo, W) Laves phase after aging at a temperature of 650°C is a distinctive feature of the structure of steel ChS139 compared to steel EK181.

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Authors and Affiliations

  1. JSC Bochvar High-Tech Research Institute of Inorganic Materials, 123098, Moscow, Russia

    N. S. Nikolaeva, M. V. Leont’eva-Smirnova & E. M. Mozhanov

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  1. N. S. Nikolaeva
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  2. M. V. Leont’eva-Smirnova
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  3. E. M. Mozhanov
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Correspondence to N. S. Nikolaeva.

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Translated by O. Kadkin

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Nikolaeva, N.S., Leont’eva-Smirnova, M.V. & Mozhanov, E.M. Effect of Thermal Aging for up to 22 Thousand Hours on the Structural and Phase State of Ferritic–Martensitic Steels EK181 and ChS139. Phys. Metals Metallogr. 123, 489–499 (2022). https://doi.org/10.1134/S0031918X22050118

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  • DOI: https://doi.org/10.1134/S0031918X22050118

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