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15 November 1996 Transmission x-ray diffraction for real-time sensing of the solidification of a casting
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Abstract
A transmission x-ray diffraction (XRD) technique has been developed which may be used, in real time, to locate the molten metal-solidifying metal interface in single-crystal castings. We proved feasibility of the sensor on samples of aluminum and copper in a gradient furnace, and found that the liquid-solid boundary could easily be identified even though the samples were surrounded by a mold wall and encased in a furnace. Subsequently, we have successfully attached the XRD sensor to a small industrial turbine blade casting furnace. The liquid-solid interface can be identified and followed, in real-time during the single- crystal casting process. The high energy x-rays permit in- furnace transmission XRD to be performed on a 6 mm thick nickel alloy specimen. The diffraction pattern was clearly seen, even though the entrance x-ray and diffraction paths through the furnace included 20 mm of Pyrex, 3.2 mm of molybdenum, 9 mm of aluminum oxide, and 12.8 mm of mold material. The x-ray source to imager distance was 1180 mm. An analytical model for transmission XRD has been developed. It is useful for assessing the feasibility of particular sensing applications.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Dale W. Fitting, William P. Dube, Tom A. Siewert, George Strabel, and John Brinegar "Transmission x-ray diffraction for real-time sensing of the solidification of a casting", Proc. SPIE 2948, Nondestructive Evaluation for Process Control in Manufacturing, (15 November 1996); https://doi.org/10.1117/12.259194
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