Thermodynamics Analysis in the Simulation Process of γ_Fe → α_Fe Isothermal Transformation’s Grain Nucleation and Growth

Abstract:

Physical simulation model of γ_Fe → α_Fe grain nucleation & growth in isothermal solid-state transformation and the rule of grain nucleation & grain growth’s boundary migration are established. The Genetic Algorithm is introduced in the process of grain nucleation & growth. The grain boundary migration agrees with the theory of grain growth. The system free energy ΔG calculation formula is exported. The thermodynamic criterion of new nucleus growing up is that new grain average radius r_c is bigger than theory critical average radius r_c0 when ΔG is achieved ΔG_max, ΔG is continually decreased at the remaining transformation, the final energy ΔG_f is less than initial energy at the end of transformation; be influenced by the limit of nucleation number N.

• Periodical: Advanced Materials Research (Volumes 399-401)
• Pages: 1773-1778
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.399-401.1773
• Online since: November 2011
• Authors: Gen Yuan Zhang, Dan Xia Lv, Guan Xing Zhao, Fei Zuo
• Keywords: Genetic Algorithm (GA), Grain Growth, Grain Nucleation, Thermodynamics Analysis

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