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Microstructure evolution and mechanical properties of flash butt-welded Inconel718 joints

机译：Inconel718闪光对焊的组织演变和力学性能

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摘要

Microstructural evolution and mechanical properties of the Inconel718 alloy subjected to flash butt welding are investigated in this work. A gradient structure without welding defaults in a heat-affected zone (HAZ) is formed on the base material (BM) because of a thermal gradient and strain gradient. A gradient of the grain size results from a decrease in the recrystallization degree from the welding seam (WS) to the coarse-grained zone (CGZ). In addition, dissolution of the γ″ and γ′ phases occurred after temporary flashing, and this is mainly responsible for the lower ductility and strength (hardness) in the HAZ. However, formation of GB carbides and their coarsening account for the decrease in impact toughness in WS and adjacent zones. Meanwhile, a double-necking phenomenon during loading is attributed to the coarse carbides in WS and to large grains in the CGZ. Despite a decrease in ductility, the welding joint exhibits sufficient formability during roundness correction and bulging deformation. This work provides a new understanding of the good properties that the flash butt-welded Inconel718 alloy has, and this is expected to be applicable for other superalloys.
机译：在这项工作中研究了Inconel718合金进行闪光对焊的组织演变和力学性能。由于热梯度和应变梯度，在基材（BM）上形成了在热影响区（HAZ）中没有焊接缺陷的梯度结构。晶粒尺寸的梯度是由于从焊缝（WS）到粗晶粒区（CGZ）的再结晶度降低而产生的。另外，γ'和γ'相的溶解在临时闪蒸之后发生，这主要是由于热影响区的延展性和强度（硬度）较低。但是，GB碳化物的形成及其粗化导致了WS和相邻区域冲击韧性的降低。同时，在加载过程中出现双颈现象是由于WS中的粗碳化物和CGZ中的大晶粒。尽管延展性降低，但是在矫正圆度和凸出变形期间，焊接接头仍具有足够的可成形性。这项工作使人们对闪光对接Inconel718合金具有的良好性能有了新的认识，并且有望将其应用于其他高温合金。

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  • 来源
    《Materials Science and Engineering》 |2018年第7期|34-42|共9页
  • 作者

    Jialin Shen; Zhijian Wei; Xueru Zhu; Yu Liang; Yilong Liang; Feilong Jiang; Zhixiang Xiao;

  • 作者单位

    College of Materials and Metallurgy, Guizhou University,Guizhou Key Laboratory for Mechanical Behavior and Microstructure of Materials;

    Guizhou Anda Aviation Forging Co., Ltd;

    College of Materials and Metallurgy, Guizhou University,Guizhou Key Laboratory for Mechanical Behavior and Microstructure of Materials;

    College of Materials and Metallurgy, Guizhou University,Guizhou Key Laboratory for Mechanical Behavior and Microstructure of Materials;

    College of Materials and Metallurgy, Guizhou University,Guizhou Key Laboratory for Mechanical Behavior and Microstructure of Materials;

    Guizhou Anda Aviation Forging Co., Ltd;

    Guizhou Anda Aviation Forging Co., Ltd;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Inconel718 alloy; Flash butt welding; Microstructure; Mechanical properties;

    机译：Inconel718合金;闪光对焊;显微组织;力学性能;

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