Solidification path of single-crystal nickel-base superalloys with minor carbon additions under laser rapid directional solidification conditions

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• 作者：Yao-Jian Liang ; Jia Li ; ^{lijia@buaa.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; An Li ; Xiao-Tong Pang ; Hua-Ming Wang
• 关键词：Laser treatment ; Superalloy ; Rapid directional solidification ; Solidification microstructure ; Phase transformations
• 刊名：Scripta Materialia
• 出版年：2017
• 出版时间：15 January 2017
• 年：2017
• 卷：127
• 期：Complete
• 页码：58-62
• 全文大小：929 K

文摘

The solidification path of single-crystal nickel-base superalloys containing minor carbon was investigated under various laser rapid directional solidification (LRDS) conditions. By controlling the solidification rate, LRDS processing can provide the evidence whether some diffusion-controlled phase transformations occur because such transformations will be suppressed under high cooling rates. Results show that the solidification path and final solidification microstructure depend upon the cooling rate; the microstructure without γ-γ′ eutectic can be obtained as long as the cooling rate is high enough. A peritectic transformation in carbon-containing single-crystal superalloys was first experimentally verified by controlling the cooling rate during LRDS processing.