Zhi-cheng WANG, Jia-rong LI, Shi-zhong LIU, Wan-peng YANG, Xiao-guang WANG
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Effects of shell mold heating temperature on microstructures and freckle formation of single crystal superalloys
To study the effects of shell mold heating temperature on the microstructure and freckle formation of single crystal superalloys, the directional solidification experiment and simulation were conducted with designed stepwise specimens. The temperature field and morphology of mushy zone were analyzed. The results show that the primary and secondary dendrite arm spacings both decrease with the rise of shell mold heating temperature. This reduces the permeability of the liquid in the mushy zone and the width of the thermal-solutal convection channel, which reduces the formation tendency of freckles, the width of freckles and the number of dendritic fragments in freckled areas. In addition, with the increase of shell mold heating temperature, the cooling rate of liquid in the mushy zone increases, which reduces the cooling time of the melt in the mushy zone, weakens the breaking capability of liquid flow to the dendrite, and further reduces the tendency of freckle formation in single crystal superalloy castings.
期刊介绍：
The Transactions of Nonferrous Metals Society of China (Trans. Nonferrous Met. Soc. China), founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, INSPEC, CA, METADEX, AJ and JICST.
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