Abstract:Moving heat source model is used to calculate the temperature distributions in friction stir lap welding. Precipitate evolution model is then combined to calculate the mean radius and volume fraction of the precipitates. The precipitate volume fraction, obtained from the precipitate evolution model, is combined with Monte Carlo model to simulate the recrystallization with consideration of the precipitate contributions. The obtained grain morphologies are re-built in finite element

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... s, which are used for the crystal plasticity model. The mechanical behavior in the stirring zone is then predicted. The integrated model of temperaturerecrystallization-precipitate-mechanical property is then completely established. Three cases of friction stir lap welding, whose parameters are identically the same with the numerical models, are performed in experiments. The comparison of experimental and numerical data can validate the proposed integrated model. Key words:friction stir welding;lap welding;Monte Carlo model;precipitate calculation;mechanical property 0 前言 搅拌摩擦焊接技术在轻质合金的对接焊 [1-2] 、搭 接焊 [3-4] 、增材制造 [5-6] 方面具有明显优势,在航空 航天、船舶、汽车、火车等制造业领域取得了工业 应用。