An experimental study of the structure and properties of metal in areas of cracks in turbine body components made of steel grade 15Kh1M1FL is conducted that shows a drop in ultimate strength with an increase in running time to the level of operating stresses. It is established that the appearance of deep cracks is accompanied by the presence of primary and selective recrystallization, in which structural strengthening created by factory heat treatment gradually disappears. Connected with this metal stress-rupture strength at 540°C for 105 h decreases by 10 – 15 MPa. Unfavorable associated signs are complete carbide phase spheroidization, an especially low critical brittleness temperature lower by 50°C, a low value of critical crack opening at the operating temperature, i.e., less than 0.25 mm, hot hardness of less than 850 MPa, and presence of micro-damage of more than 3 points on the scale for low-alloy steels.
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Translated from Élektricheskie Stantsii, No. 8, August 2022, pp. 24 – 32. DOI: https://doi.org/10.34831/EP.2022.1093.8.004
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Gladshtein, V.I., Lyubimov, A.A. Structural Signs of Exhaustion of Metal Resource in Crack Zones of Steam Steel 15KH1M1FL Turbine Body Components. Power Technol Eng 56, 731–738 (2023). https://doi.org/10.1007/s10749-023-01582-0
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DOI: https://doi.org/10.1007/s10749-023-01582-0