基于X射线体视成像实现高温合金熔体凝固三维显微结构的原位观测
收稿日期: 2023-05-08
修回日期: 2023-06-05
网络出版日期: 2023-11-16
基金资助
国家自然科学基金项目(12205361);国家重大科研仪器研制项目(11627901)
In Situ Observation of Three-Dimensional Solidification Microstructure of Superalloy Melt Based on X-Ray Stereo Imaging
Received date: 2023-05-08
Revised date: 2023-06-05
Online published: 2023-11-16
Supported by
National Natural Science Foundation of China(12205361);National Major Scientific Instruments and Equipments Development Project of China(11627901)
同步辐射X射线成像有着较高的穿透性和空间分辨率，在高温金属熔体凝固过程中微观组织形貌演化的原位观测方面有着巨大应用前景。但是二维投影成像往往丢失样品的深度信息而无法三维表征。受限于CT原位装置的时间分辨率，现有成像方法很难对高温金属熔体凝固组织进行三维动态形貌观察。本工作提出了一种可快速获取三维空间信息的同步辐射体视成像技术，利用双目视差原理，通过旋转载物台获得2个角度的透视投影图像，经立体匹配后获取双目视差实现目标物体深度信息的重建。相较于CT成像，该方法可以快速实现对目标物的准确三维重建。利用深度关系确定的静态螺旋金属丝样品，验证了该方法的有效性。并将该方法应用在高温合金熔体凝固过程的三维表征中，重建了凝固组织在厚度方向的位向关系。
王飞翔 , 陈忠奉 , 尹晓宇 , 熊良华 , 谢红兰 , 邓彪 , 肖体乔 . 基于X射线体视成像实现高温合金熔体凝固三维显微结构的原位观测[J]. 金属学报, 2025 , 61(7) : 1109 -1118 . DOI: 10.11900/0412.1961.2023.00207
The use of synchrotron radiation X-ray imaging, with its high spatiotemporal resolution and strong penetration capabilities, holds significant promise for the in situ observation of three-dimensional microstructure evolution during the solidification of superalloy melts. However, the conventional computed tomography (CT) imaging technique has limitations for capturing the dynamic solidification of superalloy melts because of the limitations of in situ solidification equipment. This work introduces a synchrotron radiation X-ray stereo imaging technique that facilitates the swift acquisition of three-dimensional spatial data. Based on the principles of binocular parallax, the stereo imaging method leverages projections obtained from two distinct angles to derive depth information about a specific region of interest. This approach boasts notable enhancements in data acquisition speed and image reconstruction when compared with CT techniques. Notably, this work introduces the relationship between binocular projection disparity and depth information and it validates the method's effectiveness by using a static spiral wire sample with a known depth relationship. The experimental results unequivocally establish that the proposed method offers high-resolution capabilities in lateral and longitudinal directions. Finally, the X-ray stereo imaging technique is successfully deployed for the three-dimensional characterization of the solidification process in superalloy melts. It effectively overcomes the challenges posed by the in situ heating device that hinder conventional CT imaging, facilitating the successful reconstruction of the orientation relationship of the solidified microstructure in the thickness direction.
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