Flash butt weldability of Inconel718 alloy
Flash butt weldability of Inconel718 alloy
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DOI：
10.1016/j.jmatprotec.2018.04.011
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发表时间：
2018-08
影响因子：
6.3
通讯作者：
Zhu Xueru-;Pingwei Xu;Yi-long Liang;Zhijian Wei;Yu Liang
中科院分区：
文献类型：
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作者：
Zhu Xueru-;Pingwei Xu;Yi-long Liang;Zhijian Wei;Yu Liang
Inconel 718闪光对焊接头在快速镦粗变形后，由于动态再结晶，在接头表面形成焊缝。临时闪蒸过程中γ″和γ′相的溶解是导致热影响区硬度下降近30%的主要原因。硬度较低的较宽区域表明温度梯度较低时产生的HAZ较宽。整个热影响区温度的升高导致碳化物的生成和晶界液化更加严重。这种不合适的显微组织导致50-70%的延性损失，而在具有合适温度梯度的另一焊接接头中仅损失约10%的延性。
Following fast upsetting deformation, the welding seam (WS) is formed at the surface of flash butt welded Inconel718 joint due to dynamic recrystallisation. The dissolution of γ″ and γ′ phases during temporary flashing is mainly responsible for the ∼30% hardness decrease in the heat-affected zone (HAZ). A wider zone with lowered hardness indicates a broader HAZ created with a gentler temperature gradient. The increased temperature in the whole HAZ leads to more serious formation of carbides and liquation at the grain boundaries. Such unsuitable microstructure accounts for a 50–70% loss of ductility, while only ∼10% of ductility is lost in another welding joint with suitable temperature gradient.