Characterization of inhomogeneous and anisotropic steel welds by ultrasonic array measurements
Characterization of inhomogeneous and anisotropic steel welds by ultrasonic array measurements
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DOI：
10.1063/1.4789133
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发表时间：
2013-01
期刊：
影响因子：
--
通讯作者：
Z. Fan;M. Lowe
中科院分区：
文献类型：
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作者：
Z. Fan;M. Lowe
奥氏体焊缝由于材料的各向异性和不均匀性，导致超声束的空间偏移，难以进行无损检测。描述这种材料的常用方法是将其视为横向各向同性，其中垂直于晶粒生长方向的平面被视为各向同性。因此，可以使用指示晶粒生长方向的焊缝性能图来描述焊缝中的材料性质。在我们的工作中，我们选择了一个焊接地图的基础上的参数的MINA模型，它使用的信息的焊接工艺和规则的晶体生长来预测的取向，因此具有良好的物理基础。我们已经比较了实测晶粒取向的一个现实的焊缝从模型的预测。该模型仅用少量的参数来描述焊缝性能，因此能够很好地实现对焊缝的优化。
Austenitic welds are difficult to inspect non-destructively by ultrasound due to the anisotropic and inhomogeneous material in the weld, which causes spatial deviation of ultrasonic beams. A common way to describe such material is to consider it as transversely isotropic, in which the plane perpendicular to the direction of the grain growth is considered to be isotropic. Therefore a weld performance map which indicates the orientation of the grain growth can be used to describe the material properties in the weld. In our work, we have chosen a weld map based on the parameters of the MINA model which uses the information of the welding procedure and rules for crystalline growth to predict the orientations, and thus has a good physical foundation. We have compared the measured grain orientations for a realistic weld with the predictions from the model. With this model, only a small number of parameters are used to describe the weld properties, therefore enabling the possibility of a well conditioned refinin...