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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials >Micromechanical aspects of fatigue in a MIG welded aluminium airframe alloy Part 1. Microstructural characterization
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Micromechanical aspects of fatigue in a MIG welded aluminium airframe alloy Part 1. Microstructural characterization

机译：MIG焊接铝机身合金疲劳的微观力学方面第1部分。微观结构表征

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摘要

Fusion welding of high strength aluminium alloys is being widely considered within the commercial aircraft industry as an alternative to established mechanical fastening methods. The objective of the present article is to characterise the microstructural features of metal inert gas (MIG) welded plate of the conventional damage tolerant alloy, 2024-T351. Micromechanical aspects of the fatigue performance of this welded material are then addressed in a companion article. The general microstructure of the MIG weld was studied using optical microscopy and scanning electron microscopy, in association with electron back-scattered diffraction mapping. Columnar dendritic structures at the edge of the fusion zone are seen, with fairly uniform equiaxed dendritic grain structure dominating in the weld centre. Local microstructural conditions of the different elements of the weld have been assessed via micro-hardness and differential scanning calorimetry, identifying the balance between aging, overaging, re-solutionising and re-precipitation occurring across the weld region. Residual stress measurements by laboratory X-ray and synchrotron X-ray diffraction are also discussed, showing stress relaxation and redistribution occurring under loads representative of smooth specimen fatigue testing. The fusion zone is seen to present a tensile residual stress field, with peak longitudinal stress occurring towards the interface with the fusion zone.
机译：在商业飞机工业中，高强度铝合金的熔焊已被认为是已建立的机械紧固方法的替代方法。本文的目的是表征常规耐蚀合金2024-T351的金属惰性气体（MIG）焊接板的显微组织特征。然后在随附的文章中讨论了这种焊接材料的疲劳性能的微机械方面。使用光学显微镜和扫描电子显微镜，结合电子反向散射衍射图谱，研究了MIG焊缝的一般组织。可以看到在熔合区边缘的柱状树枝状结构，在焊接中心占据了相当均匀的等轴树枝状晶粒结构。已通过显微硬度和差示扫描量热法评估了焊缝中不同元素的局部显微组织状况，确定了整个焊缝区域发生的时效，过时效，再固溶和再沉淀之间的平衡。还讨论了通过实验室X射线和同步加速器X射线衍射进行的残余应力测量，显示了在代表光滑样本疲劳测试的载荷下发生的应力松弛和重新分布。可以看到融合区呈现出拉伸残余应力场，并且在与融合区的界面处出现了最大的纵向应力。

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