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01-05-2022 | STRUCTURE, PHASE TRANSFORMATIONS, AND DIFFUSION
Effect of Thermal Aging for up to 22 Thousand Hours on the Structural and Phase State of Ferritic–Martensitic Steels EK181 and ChS139
Published in: Physics of Metals and Metallography | Issue 5/2022
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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.