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首页> 外文OA文献 >Neutron diffraction residual stress measurements on girth-welded 304 stainless steel pipes with weld metal deposited up to half and full pipe wall thickness
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Neutron diffraction residual stress measurements on girth-welded 304 stainless steel pipes with weld metal deposited up to half and full pipe wall thickness

机译：环焊304不锈钢管的中子衍射残余应力测量，焊缝金属沉积到一半和全管壁厚度

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The residual stress distribution has been measured in two girth-welded austenitic stainless steel pipe weldments using time-of-flight neutron diffraction. One had weld filler metal deposited up to half the pipe wall thickness, and one had weld metal deposited up to full pipe wall thickness. The aim of the work is to evaluate the evolution in residual stress profile on filling the weld, on which there is little experimental data, and where the selection of the correct hardening model used in finite element modelling can benefit greatly from an understanding of the intermediate residual stresses partway through the welding operation. The measured residual stresses are compared with those calculated by finite element modelling and measured using X-ray diffraction. The results show a change in the measured hoop stress at the weld toe from tension to compression between the half-and fully-filled weld. The finite element results show an overprediction of the residual stress, which may be a consequence of the simple isotropic hardening model applied. The results have implications for the likely occurrence of stress corrosion cracking in this important type of pipe-to-pipe weldment.
机译：残余应力分布已通过飞行中子衍射在两个环缝奥氏体不锈钢管焊件中进行了测量。一种是将焊接填充金属沉积到管壁厚度的一半，另一种是将焊接金属沉积到管壁厚度的全壁。这项工作的目的是评估焊缝填充时残余应力分布的变化，在此情况下，实验数据很少，并且在有限元建模中选择正确的硬化模型可以从对中间件的理解中受益匪浅。焊接操作途中的残余应力。将测得的残余应力与通过有限元建模计算出的残余应力进行比较，并使用X射线衍射进行测量。结果表明，在半填充和全填充焊缝之间，焊缝处测得的环向应力从拉伸到压缩的变化。有限元结果显示了残余应力的过度预测，这可能是所应用的简单各向同性硬化模型的结果。结果表明，在这种重要的管对管焊件中，可能会发生应力腐蚀开裂。

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