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林志成, 赵运强, 闫德俊, 刘莉, 董春林. 高镁铝合金搅拌摩擦交叉焊接头微观组织与力学性能[J]. 焊接学报, 2022, 43(10): 24-30. DOI: 10.12073/j.hjxb.20220510001
引用本文: 林志成, 赵运强, 闫德俊, 刘莉, 董春林. 高镁铝合金搅拌摩擦交叉焊接头微观组织与力学性能[J]. 焊接学报, 2022, 43(10): 24-30. DOI: 10.12073/j.hjxb.20220510001
LIN Zhicheng, ZHAO Yunqiang, YAN Dejun, LIU Li, DONG Chunlin. Study on microstructure and mechanical properties of new generation high-magnesium aluminum alloy cross-welded joints by friction stir welding-friction stir welding[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2022, 43(10): 24-30. DOI: 10.12073/j.hjxb.20220510001
Citation: LIN Zhicheng, ZHAO Yunqiang, YAN Dejun, LIU Li, DONG Chunlin. Study on microstructure and mechanical properties of new generation high-magnesium aluminum alloy cross-welded joints by friction stir welding-friction stir welding[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2022, 43(10): 24-30. DOI: 10.12073/j.hjxb.20220510001

高镁铝合金搅拌摩擦交叉焊接头微观组织与力学性能

Study on microstructure and mechanical properties of new generation high-magnesium aluminum alloy cross-welded joints by friction stir welding-friction stir welding

  • 摘要: 为满足大型铝合金船舶壁板的制造需求,对新一代高镁铝合金进行了搅拌摩擦交叉焊接试验. 结果表明,交叉焊接头成形良好,搅拌区晶粒尺寸最小,热力影响区晶粒形态没有明显方向性,与单道搅拌摩擦焊相比,交叉焊接头搅拌区晶粒组织更细. 显微硬度测试结果表明,交叉焊接头显微硬度变化范围较小,前进侧接头软化明显;拉伸试验测试结果表明,交叉焊接头抗拉强度为340 MPa,为母材强度的87%,对比搅拌摩擦焊接头抗拉强度358 MPa略微降低,在热影响区断裂,断裂方式为45°韧性断裂;疲劳裂纹萌生于焊缝底部,在最大应力150 MPa下循环超2 × 106次未断裂,疲劳性能良好,瞬断区断裂方式为韧性断裂.

     

    Abstract: In order to meet the manufacturing requirements of large aluminum alloy ship panels, the cross-welded by friction stir welding-friction stir welding (FSW/FSW) tests of new generation high-magnesium aluminum alloy were carried out. The results show that a well FSW/FSW joint was obtained. Grain size in stir zone (SZ) is the smallest, and there is no obvious directionality of grains morphology in thermo mechanical affected zone (TMAZ). The grain size in the SZ of the FSW/FSW joint is smaller than that of the FSW. Hardness test results show that hardness in the FSW/FSW weld joint has a smaller variation range as compared to the FSW joint. A soft region appears in the advancing side (AS) of the FSW/FSW joint. Tensile test results show that the tensile strength of FSW/FSW joint is 340 MPa, which is around 87% of the base material. The tensile samples fracture in the heat-affected zone (HAZ) is a typical ductile fracture mode along the 45° to the tensile direction. The strength of the FSW/FSW joint is slightly lower than that of FSW joint (358 MPa). The fatigue cycle of the cross-welded joint is up to 2 × 106 times without fracture when the maximum stress is 150 MPa, indicating an excellent anti-fatigue performance. Fatigue cracks main initiate at the bottom of the joint, and the fracture mode of transient fault zone is ductile fracture.

     

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