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首页> 外文期刊>Journal of Materials Engineering and Performance >On the Microstructural and Mechanical Characterization of Hybrid Laser-Welded Al-Zn-Mg-Cu Alloys
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On the Microstructural and Mechanical Characterization of Hybrid Laser-Welded Al-Zn-Mg-Cu Alloys

机译：混合激光焊接Al-Zn-Mg-Cu合金的组织和力学性能

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摘要

Butt-welded 2-mm-thick high-strength aluminum alloys have been welded using a hybrid fiber laser and pulsed arc heat source system with the ER5356 filler. The microstructure, size of precipitates, texture, grain size and shape, change of strengthening elements, mechanical properties, and surface-based fatigue fracture characteristics of hybrid-welded joints were investigated in detail. The results indicate that the hybrid welds and the unaffected base materials have the lowest and largest hardness values, respectively, compared with the heat-affected zone. It is resonably believed that the elemental loss, coarse grains, and changed precipitates synthetically produce the low hardness and tensile strengths of hybrid welds. Meanwhile, the weaker grain boundary inside welds appears to initiate a microcrack. Besides, there exists an interaction of fatigue cracks and gas pores and microstructures.
机译：对接焊接的2毫米厚的高强度铝合金已使用带有ER5356填料的混合光纤激光和脉冲电弧热源系统进行了焊接。详细研究了混合焊接接头的微观结构，析出物尺寸，织构，晶粒尺寸和形状，强化元素的变化，力学性能以及基于表面的疲劳断裂特性。结果表明，与热影响区相比，混合焊缝和未受影响的母材分别具有最低和最大的硬度值。合理地认为，元素损失，粗大晶粒和变化的析出物综合地产生了混合焊缝的低硬度和抗拉强度。同时，焊缝内部较弱的晶界似乎会引发微裂纹。此外，疲劳裂纹与气孔和微观结构之间存在相互作用。

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