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论文类型：期刊论文

发表时间：2017-05-01

发表刊物：JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE

收录刊物：SCIE、EI、Scopus

卷号：26

期号：5

页面范围：2179-2189

ISSN号：1059-9495

关键字：friction stir welding; grain size; Monte Carlo method; precipitation

摘要：Friction stir welding of AA6082-T6 with different welding parameters is simulated by computational fluid dynamics model. Monte Carlo method is further used to simulate the grain growth with consideration of the precipitation effects. The comparison with experimental observations can validate the proposed grain growth model with the precipitate effects. Results indicate that the final grain size can be increased by 39.7% in the nugget zone when the volume fraction of precipitation is decreased from 0.8 to 0.2% after welding. Both the grain growth speed and the final grain size on the top surface are higher than the bottom surface. The increase in the welding temperature caused by the increase in the rotation speeds or the axial forces can lead to lower volume fractions of precipitations and then lead to larger grain sizes.