Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7176351 | Journal of Materials Processing Technology | 2018 | 20 Pages |
Abstract
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 γⳠand γⲠphases during temporary flashing is mainly responsible for the â¼30% 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 â¼10% of ductility is lost in another welding joint with suitable temperature gradient.
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Authors
Xueru Zhu, Pingwei Xu, Yilong Liang, Zhijian Wei, Yu Liang,