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Modeling Precipitation Kinetics During Heat Treatment with Calphad-Based Tools

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Abstract

Sophisticated precipitation reaction models combined with well-developed CALPHAD databases provide an efficient way to tailor precipitate microstructures that maximize strengthening via the optimization of alloy chemistries and heat treatment schedules. The success of the CALPHAD approach relies on the capability to provide fundamental phase equilibrium and phase transformation information in materials of industrial relevance taking into consideration composition and temperature variation. The newly developed TC-PRISMA program is described. The effect of growth modes, alloy chemistries, and cooling profiles on the formation of multimodal microstructures has been examined in order to understand the underlying thermodynamics and kinetics. Practical issues that are critical to the accuracy and applicability of the current simulations, such as modifications that overcome mean field approximations, compatibility between CALPHAD databases, and selections of key parameters (particularly interfacial energy and nucleation site densities), are also addressed.

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Correspondence to Paul Mason.

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This article is an invited paper selected from presentations at the 27th ASM Heat Treating Society Conference, held September 16-18, 2013, in Indianapolis, IN, and has been expanded from the original presentation.

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Chen, Q., Wu, K., Sterner, G. et al. Modeling Precipitation Kinetics During Heat Treatment with Calphad-Based Tools. J. of Materi Eng and Perform 23, 4193–4196 (2014). https://doi.org/10.1007/s11665-014-1255-6

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  • DOI: https://doi.org/10.1007/s11665-014-1255-6

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