Creep Deformation Behavior of Inconel 617 Alloy in the Temperature Range of 650 degrees C to 800 degrees C

Bagui, S and Sahu, B P and Laha, K and Tarafder, Soumitra and Mitra, R (2021) Creep Deformation Behavior of Inconel 617 Alloy in the Temperature Range of 650 degrees C to 800 degrees C. Metallurgical and materials transactions A-physical metallurgy and materials science, 52(1) . pp. 94-107.

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Creep behavior of the Inconel 617 alloy has been investigated through tests carried out in the temperature range of 650 degrees C to 800 degrees C under 95 to 350 MPa. Creep curves obtained from tests on the alloy exhibit a non-classical nature, with the primary creep rate decreasing to a minimum value, followed by a typical increase, which is either continuous at temperatures <= 700 degrees C or has an intermediate steady-state regime at 750 degrees C or 800 degrees C. The variation of minimum creep rate (epsilon(min)) with stress (sigma) obeys the power law relationship (epsilon(min) = A sigma(n)), with the stress exponent, n, increasing with temperature to a peak value at similar to 700 degrees C. The value of n > 5 has been rationalized by considering the existence of threshold stress, which like n has been found to decrease sharply with temperature beyond 700 degrees C. Investigation of the post-creep microstructures by transmission electron microscope has revealed the formation of gamma ' and M23C6 precipitates, which obstruct dislocation motion during the primary stage. Microstructures of the samples creep-tested at >= 750 degrees C have exhibited relatively smaller amounts of gamma '. The existence of threshold stress and the steady-state regime in the tertiary creep stage has been ascribed to obstruction of dislocation motion by M23C6 and gamma ' precipitates.

Item Type:Article
Official URL/DOI:http://10.1007/s11661-020-06066-8
Uncontrolled Keywords:Self-diffusion; threshold stress; microstructure; nickel; oxidation; helium; metals; cobalt; foils
Divisions:Material Science and Technology
ID Code:8257
Deposited By:Sahu A K
Deposited On:16 Dec 2020 11:56
Last Modified:06 Jan 2021 16:34
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