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• W4225000327 abstract "In the present paper, microstructural evolutions and their effects on mechanical properties of IN617 superalloy were investigated in as-received and operated samples. Samples had been operated at 850 °C, under a medium working stress for operating times of 24,000, 35,000 and 66,000 h. Microstructural characterization was performed using SEM, TEM and XRD analysis of samples. Mechanical properties of the samples were evaluated using tensile, impact and hardness tests. An important change in the microstructure is the increase in volume fraction of carbides with increasing operating time. Initially, carbides are formed as discrete particles along the grain boundaries and then with increasing the operating time, they continue to be formed as continuous phases along the grain boundaries, twin boundaries, and as scattered particles within the grains. A small percentage of carbides with dimensions of more than one micron are plate-like and rod-shaped and other quasi-spherical and irregular shapes. The shapes of the particles smaller than one micron are blocky, spherical and regular polygons. In addition to carbides and Ti(C,N) compound, a very small amount of γ′ phase was also detected in the sample operated for 24,000 h, based on X-ray diffraction analysis of the particles extracted from this sample. Based on the analysis of the extracted particles, the weight percentage of M23C6 carbide increases from 63% in the 24,000 h sample to 80% in the 66,000 h sample; while that of M6C carbide decreases from 23 to 8%. In other words, a part of M6C carbide is converted to M23C6, which is the stable carbide at 850 °C. The strength and hardness of the alloy increase after operating for up to 24,000 h, but then they start to decrease by increasing the operating time, and after operating for 66,000 h, the strength and hardness become less than the properties of the as-received alloy. Changes in strength and hardness values are consistent with microstructural changes in samples. Impact energy is reduced by 75% in 24,000 h compared to the as-received sample, and after that time, the decrease in the impact energy continues with a small rate." @default.
• W4225000327 created "2022-04-29" @default.
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• W4225000327 date "2022-08-01" @default.
• W4225000327 modified "2023-09-30" @default.
• W4225000327 title "Precipitation behavior and mechanical properties of IN 617 superalloy during operating at 850 °C" @default.
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• W4225000327 doi "https://doi.org/10.1016/j.ijpvp.2022.104674" @default.
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