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首页> 外文期刊>Materials & design >Effect of base metal and welding speed on fusion zone microstructure and HAZ hot-cracking of electron-beam welded Inconel 718
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Effect of base metal and welding speed on fusion zone microstructure and HAZ hot-cracking of electron-beam welded Inconel 718

机译：母材和焊接速度对电子束焊接Inconel 718的熔合区组织和热影响区热裂纹的影响

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摘要

Influences of base metal and welding speed on fusion zone microstructure and heat affected zone (HAZ) hot-cracking of electron beam welded (EBW) Inconel 718 were investigated systematically. Microstructures of fusion zone and HAZ were characterized using the optical microscope and a field emission scanning electron microscope, complemented by the microhardness measurements. It is found that the weld shape transforms from a stemless wine glass shape to a nail head shape with the increase of the grain size of base metal. The largest amount of Laves or the lowest hardness is obtained in the center of the weld pool, which mainly due to the strong microsegregation in this region. The microsegregation of weld pool is significantly affected by welding speed, which is associated with the rate of transference of energy to the weld. The occurrence of HAZ cracking is related to the grain boundary and the generation of porosities is induced by fracture of the brittle carbides. Furthermore, the susceptibility of HAZ cracking is greatly dependent on the grain size of base metal and welding speed.
机译：系统地研究了母材和焊接速度对电子束焊接（EBW）Inconel 718的熔合区组织和热影响区（HAZ）热裂的影响。利用光学显微镜和场发射扫描电子显微镜对融合区和热影响区的微观结构进行了表征，并辅以显微硬度测量。结果发现，随着母材晶粒尺寸的增加，焊缝形状从无茎酒杯形转变为钉头形。在熔池的中心可获得最多的Laves或最低的硬度，这主要是由于该区域中的强烈微偏析。焊接速度的显着影响焊缝池的微观偏析，焊接速度与能量向焊缝的转移速率有关。 HAZ裂纹的发生与晶界有关，并且由于脆性碳化物的断裂而引起气孔的产生。此外，热影响区裂纹的敏感性很大程度上取决于母材的晶粒尺寸和焊接速度。

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  • 来源
    《Materials & design》 |2016年第1期|964-977|共14页
  • 作者

    Yunpeng Mei; Yongchang Liu; Chenxi Liu; Chong Li; Liming Yu; Qianying Guo; Huijun Li;

  • 作者单位

    State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300072, PR China;

    State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300072, PR China;

    State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300072, PR China;

    State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300072, PR China;

    State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300072, PR China;

    State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300072, PR China;

    State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300072, PR China;

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

    Inconel 718; Electron beam welding; Solute redistribution coefficient; Varestraint test; HAZ cracking;

    机译：因科镍合金718;电子束焊接;溶质再分配系数;压力测试HAZ开裂;
  • 入库时间 2022-08-17 13:17:14

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