Investigation of electron-beam welding in wrought Inconel 706 - experimental and numerical analysis
Investigation of electron-beam welding in wrought Inconel 706 - experimental and numerical analysis
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DOI：
10.1016/j.msea.2004.10.039
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发表时间：
2005-02-15
期刊：
影响因子：
6.4
通讯作者：
Bonollo, F
中科院分区：
文献类型：
--
作者：
Ferro, P;Zambon, A;Bonollo, F
电子束焊接(EBW)在航空发动机工业中普遍用于焊接由高强度高温合金制成的高完整性部件。对于这样的应用，预测工艺引起的变形和残余应力是很重要的。采用电子束焊接技术，对镍基高温合金Inconel706板材进行了熔化试验，分析了焊接参数对焊缝几何特征和组织的影响。然后通过拉伸试验、显微组织分析和X射线衍射测量对对接焊板进行了研究。采用热-力非耦合分析方法建立了该过程的有限元模型。为了再现熔合区(FZ)的钉形形状，采用了具有高斯功率密度分布的球形和圆锥形热源的叠加来模拟热源。选择了源的参数，使模型与用热电偶测量的实验确定的熔池形状和温度相匹配。随后，用热分析来驱动非线性力学分析。然后将预测的残余应力与X射线衍射测量结果进行了比较。研究发现，熔合区的形状会影响热应力和残余应力的准确预测，最大的热拉应力出现在熔合区钉头下，在那里可以观察到微裂纹。(C)2004爱思唯尔B.V.保留所有权利。
Electron-beam welding (EBW) is commonly employed in the aeroengine industry for the welding of high integrity components, fabricated from high-strength superalloys. For such applications, it is important to predict distortions and residual stresses induced by the process. Melt run trials have been carried out on nickel-base superalloy Inconel 706 plates using the EBW technique in order to analyse the effects of welding parameters on geometrical characteristics and microstructure of the bead. Butt-welded plates have been then investigated by means of tensile tests, microstructural analysis, and X-ray diffraction measurements. A finite element model of the process has been set up using an uncoupled thermal-mechanical analysis. The heat source was modelled using a superimposition of a spherical and a conical shape heat source with Gaussian power density distribution in order to reproduce the nail shape of the fusion zone (FZ). The parameters of the source were chosen so that the model would match with experimentally determined weld pool shape and temperatures, measured with thermocouples. Subsequently, the thermal analysis was used to drive the non-linear mechanical analysis. The predicted residual stresses were then compared with X-ray diffraction measurements. It was found that the correct thermal and residual stresses prediction is influenced by the shape of the fusion zone, the highest thermal tensile stress arising under the nailhead of the fusion zone where microfissuring can be observed. (C) 2004 Elsevier B.V. All rights reserved.