Effect of molybdenum addition on precipitate coarsening kinetics in Inconel 740H: A phase-field study

Ghosh, S and Kumar, H and Brandl, C and Choudhury, AN and Bhattacharyya, S and Mukherjee, R (2024) Effect of molybdenum addition on precipitate coarsening kinetics in Inconel 740H: A phase-field study. In: Intermetallics, 175 .

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Abstract

Inconel 740H (IN740H) has emerged as an important candidate for the advanced ultra-supercritical (AUSC) steam turbines due to its superior microstructural stability and creep resistance under service conditions. In the present work, we have reparameterized a multicomponent Ni-based superalloy (IN740H) into an equivalent ternary Ni-Al-Mo superalloy, based on the partitioning coefficients of the elements, using the thermodynamic database (CALPHAD). We use this thermodynamic description to employ a quantitative phase-field model to assess the long-term stability of γ� precipitates in IN740H utilizing GPU-based supercomputing architecture. The assessment helps us to enhance our understanding of the effect of the atomic diffusivity of Mo on coarsening kinetics of the γ�-precipitates in equivalent ternary Ni-Al-Mo superalloy. Investigation reveals that our phase-field model can accurately predict the experimentally observed coarsening kinetics in IN740H. © 2024 Elsevier Ltd

Item Type:	Journal Article
Publication:	Intermetallics
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to the publisher.
Keywords:	Coarsening; Creep resistance; Molybdenum; Nickel alloys, Calphad; Coarsening kinetics; Coarsenings; Field studies; Inconel; Inconel 740h; Phase field models; Phase fields; Precipitate coarsening; γ' precipitates, Steam turbines
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	12 Nov 2024 18:39
Last Modified:	12 Nov 2024 18:39
URI:	http://eprints.iisc.ac.in/id/eprint/86659

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