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Effect of Microstructural Evolution on Creep and Rupture Behavior of Inconel 617 Alloy

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Abstract

The Inconel 617 alloy has been creep-tested at different combinations of loads (80-350 MPa) and temperatures (650-800 °C), considering its use in the advanced ultra-super critical (AUSC) boiler. The values of Monkman–Grant and modified Monkman–Grant constants obtained by analyzing the creep data are considered as related to the observed microstructural instability during creep at  ~  650-800 °C. The presence of intragranular secondary γ′ precipitates has led to significantly higher strength inside the grains compared to that of their boundaries, found to have a scanty population of secondary (Cr,Mo)23C6 precipitates. As a result, formation of creep cavities leading to intergranular fracture has been observed in the temperature range of 650-750 °C. The creep damage tolerance factor, λ, found as ~ 2.5 by empirical damage analysis on the basis of test results is in tune with the predominance of creep cavitation in the temperature range of 650-750 °C. In contrast, both the obtained value of λ ~ 10.51 and the mixed mode nature of the fracture surface observed for the sample creep tested at 800 °C are considered due to substantial localized plastic deformation or necking. Increased creep ductility with necking is ascribed primarily to the reduced the grain body strength caused by the absence of γ′ precipitates and the grain boundary sliding being restricted by the discrete secondary (Cr,Mo)23C6 precipitates present in abundance along the grain boundary. Based on the plot of applied stress against Larson–Miller parameter, it is possible to predict that the Inconel 617 alloy would withstand the steam pressure of 30 MPa at 750 °C for a design life of 105 h experienced in a typical AUSC boiler tube.

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Acknowledgments

Authors sincerely acknowledge the in-house project (No. OLP-0253) of CSIR-National Metallurgical Laboratory, Jamshedpur, to execute the present investigation. Authors are thankful to the help received from the Central Research Facility, IIT Kharagpur, for TEM work.

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  1. Materials Engineering Division, CSIR-National Metallurgical Laboratory, Jamshedpur, Jharkhand, 831007, India

    Sumanta Bagui, Bhupeshwar Mahato, Monalisa Mandal & Soumitra Tarafder

  2. Metallurgical and Materials Engineering Department, Indian Institute of Technology, Kharagpur, West Bengal, 721302, India

    Sumanta Bagui, Bibhu Prasad Sahu & Rahul Mitra

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  1. Sumanta Bagui
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Bagui, S., Sahu, B.P., Mahato, B. et al. Effect of Microstructural Evolution on Creep and Rupture Behavior of Inconel 617 Alloy. J. of Materi Eng and Perform 32, 1292–1309 (2023). https://doi.org/10.1007/s11665-022-07162-z

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