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Microstructural Characterization of Cold Bent and Subsequent Thermal Aged Inconel Alloy 617

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Abstract

Inconel alloy 617 is a solid-solution-strengthened nickel base super alloy having 55% Ni, 22% Cr, 9% Mo, 12% Co, 1% Al and 0.4% Ti as the main alloying elements. The alloy 617 has very good corrosion resistance and an exceptional combination of high-temperature strength and oxidation resistance. An attempt was made to determine the microstructural effects of thermal ageing on the cold bent Inconel tubes. For this investigation, the Inconel alloy 617 tubes are cold bent at the R/D ratio of 3 in tube bending machine. Then, the cold bent tubes are thermally aged at 750 °C for 1000 h’ duration in the furnace. The specimens extracted from bent tubes are characterized using the transmission electron microscopy (TEM). The gamma prime γ’-Ni3(Al,Ti) phase identified in the TEM micrograph has been further confirmed in the spectroscopy chemical analysis and electron diffraction pattern. Further, STEM-EDS analysis also depicts the presence of chromium-rich M23C6, Ti(C,N) and Mo-rich M6C and Mo-rich M3B2.

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Acknowledgements

Author is grateful to Shri S.M. Ramanathan, General Manager (I/c), Bharat Heavy Electricals Limited (BHEL) Tiruchirappalli for providing required approval for publication. Author also thank Shri S. Gowrisankar (GM/WRI, NGA & Labs) and Shri. I. Kalyanasundaram (AGM/WRI) for the constant encouragement and support. Author also thank Shri R. Easwaran (GM I/c retd.) and Dr. G. Ravichandran (GM /WRI retd.) for the valuable discussion and motivation.

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  1. Welding Research Institute, Bharat Heavy Electricals Limited (BHEL), Tiruchirappalli, India

    Vimalan Gurunathan

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  1. Vimalan Gurunathan
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Gurunathan, V. Microstructural Characterization of Cold Bent and Subsequent Thermal Aged Inconel Alloy 617. Trans Indian Inst Met 76, 3105–3114 (2023). https://doi.org/10.1007/s12666-023-03099-6

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