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Local deformation response and failure behavior of AA6061-AA6061 and AA6061-AA7075 friction stir welds
CIRP Journal of Manufacturing Science and Technology ( IF 4.8 ) Pub Date : 2020-05-04 , DOI: 10.1016/j.cirpj.2020.03.006
Harish Suthar , Anirban Bhattacharya , Surajit Kumar Paul

Friction stir welding (FSW) is generally associated with a gradient in plastic deformation and temperature, which results in the evolution of heterogeneous microstructure thereby, the variation of mechanical properties along the weld. It becomes critical to study this variation in mechanical properties to understand the mechanism involved in the failure of the FSW joints. In the present study, the local strain response is investigated using digital image correlation (DIC) for FSW joints of similar AA6061-AA6061 and dissimilar AA6061-AA7075 alloys (placing AA6061-T6 and AA7075-T6 in advancing and retreating side respectively). Local strain evaluated through DIC revealed the localization of strain at the heat-affected zone (HAZ) in similar FSW joint and joint failed from the HAZ. Opposing to this, in dissimilar FSW joint the localization of strain occurs at two sections, in HAZ and at the stir zone (SZ) edge in the advancing side (AS) of the joint. However, the failure occurred at SZ edge containing defects such as microvoids. On the other hand, dissimilar FSW joint without defects failed from HAZ in AS of the joint. The microhardness measurement revealed low hardness in HAZ of the weld. Notch tensile tests are carried out to allow the failure to occur in different zones found in the similar and dissimilar FSW joint. The HAZ in a similar FSW has shown the least resistance to failure induced by the notch. Fractography of the similar FSW joint revealed a ductile failure. However, the fractography of dissimilar FSW suggested a failure affected by defects and weak bonding at SZ edge in AS.



中文翻译:

AA6061-AA6061和A6061-AA7075搅拌摩擦焊缝的局部变形响应和破坏行为

搅拌摩擦焊(FSW)通常与塑性变形和温度的梯度相关,这会导致异质组织的演变,从而导致沿焊缝的机械性能发生变化。研究机械性能的这种变化以了解FSW接头失效的机理变得至关重要。在本研究中,使用数字图像相关(DIC)研究相似AA6061-AA6061和不相似AA6061-AA7075合金(分别在前进和后退位置分别放置AA6061-T6和AA7075-T6)的FSW接头的局部应变响应。通过DIC评估的局部应变揭示了应变在类似FSW接头的热影响区(HAZ)中的定位,并且接头因HAZ失效。反对 在不同的FSW接头中,应变的局部化发生在两个区域中,即热影响区和接头前进侧(AS)的搅拌区(SZ)边缘。但是,失效发生在包含缺陷(例如微孔)的SZ边缘。另一方面,没有缺陷的异种FSW接头由于接头AS中的HAZ失效。显微硬度测量表明焊缝的热影响区硬度较低。进行缺口拉伸试验以使失效发生在相似和不相似的FSW接头中的不同区域。在类似的FSW中,热影响区显示出对缺口引起的故障的抵抗力最小。相似的FSW关节的分形显示有韧性破坏。但是,不同FSW的形貌表明,该故障受AS中SZ边缘的缺陷和弱结合影响。在热影响区和关节前进侧(AS)的搅拌区(SZ)边缘。但是,失效发生在包含缺陷(例如微孔)的SZ边缘。另一方面,没有缺陷的异种FSW接头由于接头AS中的HAZ失效。显微硬度测量表明焊缝的热影响区硬度较低。进行缺口拉伸试验以使失效发生在相似和不相似的FSW接头中的不同区域。在类似的FSW中,热影响区显示出对缺口引起的故障的抵抗力最小。相似的FSW关节的分形显示有韧性破坏。但是,不同FSW的形貌表明,该故障受AS中SZ边缘的缺陷和弱结合影响。在热影响区和关节前进侧(AS)的搅拌区(SZ)边缘。但是,失效发生在包含缺陷(例如微孔)的SZ边缘。另一方面,没有缺陷的异种FSW接头由于接头AS中的HAZ失效。显微硬度测量表明焊缝的热影响区硬度较低。进行缺口拉伸试验以使失效发生在相似和不相似的FSW接头中的不同区域。在类似的FSW中,热影响区显示出对缺口引起的故障的抵抗力最小。相似的FSW关节的分形显示有韧性破坏。但是,不同FSW的形貌表明,该故障受AS中SZ边缘的缺陷和弱结合影响。另一方面,没有缺陷的异种FSW接头由于接头AS中的HAZ失效。显微硬度测量表明焊缝的热影响区硬度较低。进行缺口拉伸试验以使失效发生在相似和不相似的FSW接头中的不同区域。在类似的FSW中,热影响区显示出对切口引起的故障的抵抗力最小。相似的FSW关节的分形显示有韧性破坏。但是,不同FSW的形貌表明,该故障受AS中SZ边缘的缺陷和弱结合影响。另一方面,没有缺陷的异种FSW接头由于接头AS中的HAZ失效。显微硬度测量表明焊缝的热影响区硬度较低。进行缺口拉伸试验以使失效发生在相似和不相似的FSW接头中的不同区域。在类似的FSW中,热影响区显示出对缺口引起的故障的抵抗力最小。相似的FSW关节的分形显示有韧性破坏。但是,不同FSW的形貌表明,该故障受AS中SZ边缘的缺陷和弱结合影响。在类似的FSW中,热影响区显示出对缺口引起的故障的抵抗力最小。相似的FSW关节的分形显示有韧性破坏。但是,不同FSW的形貌表明,该故障受AS中SZ边缘的缺陷和弱结合影响。在类似的FSW中,热影响区显示出对缺口引起的故障的抵抗力最小。相似的FSW关节的分形显示有韧性破坏。但是,不同FSW的形貌表明,该故障受AS中SZ边缘的缺陷和弱结合影响。

更新日期:2020-05-04
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