Homogeneous Microstructure of Bulk K4169 Superalloy Obtained by Stable Undercooling

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• 作者：Zhang Keren^a ; ^b ; Xie Faqin^a ; Hu Rui^b ; ^{rhu@nwpu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Li Jinshan^b ; Wu Xiangqing^a
• 关键词：K4169 superalloy ; undercooling ; purification ; temperature field ; microstructure ; homogeneity
• 刊名：Rare Metal Materials and Engineering
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：45
• 期：2
• 页码：282-286
• 全文大小：1213 K

文摘

By improving the method of B₂O₃ glass purification combined with cycle superheating based on traditional undercooling method, a stable undercooling above 200 K of 100 g bulk K4169 superalloy was obtained, and the largest undercooling went to 271 K. The effects of purification and superheating temperature on undercooling have been discussed. Moreover, the three-dimensional numerical analysis of temperature field inside the undercooled melt has been presented, and the maximum temperature deviation in different parts is only 14 K before nucleation. In contrast with the as-solidified microstructure, the grain size will increase with the increment of nucleating temperature. Generally, the difference of microstructure in 100 g undercooled K4169 superalloy is tiny and the average grain size of the superalloy with 271 K undercooling is 12±2 μm.