In-situ observation of solidification process of weld by using synchrotron radiation towards construction of simulation model of weld solidification

采用时间分辨X射线衍射技术分析了不锈钢焊缝的凝固过程。利用波荡器光束和新型X射线探测器，在倒易晶格空间中分析了凝固过程中的相演化和液相还原。此外，估计温度，刺激杂散晶粒的形成，在焊缝中心线的温度分布进行了测量，通过使用辐射温度计与浸入式光纤。结果表明，所获得的与凝固焊缝有关的物理量对建立焊缝凝固的相场模型是有用的。

The solidification process in stainless steel welds was analyzed using a time-resolved X-ray diffraction technique. By using an undulator beam and a novel X-ray detector, not only the phase evolution during the solidification process but also the liquid reduction during the solidification process were analyzed in the reciprocal lattice space. Furthermore, to estimate the temperature that stimulates stray grain formation, the temperature profile at the centerline of a weld bead was measured by using a radiation thermometer with immersion-type optical fiber. It was shown that the acquired physical quantity concerning to solidification weld was useful toward construction of the phase-field model of weld solidification.