加熱・冷却過程の拡散形相変態のカイネティックスと溶接過程のシミュレーションへの適用

概要

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Adequate kinetic equations are required to express phase transformations which include reverse processes of heating as well as cooling during welding, heat treatment and so on. Governing equations which depend on temperature, elastic strain and distribution of grain diameter of a material are proposed in order to enable the representation of the diffusional transformation during the continuous process between heating and cooling. Diagrams of time-temperature-transformation (T-T-T) and time-temperature-austenitization (T-T-A) are calculated for eutectoid steel. Based on the kinetic theory proposed in this paper, a method of the welding process is presented using a viscoplastic constitutive equation, which may cover the region of molten and solidified states. Numerical results show the practical modes of temperature, structure change and induced stress/strain in the process.
社団法人日本機械学会の論文
1994-07-25