典型文献
Effect of Zr on solidification and microstructure of a Ni-based superalloy with high Al and Ti contents
文献摘要：
The total content of Al and Ti in advanced Ni-based wrought superalloys is up to 7.5wt.％, which makes it easier to form harmful nonequilibrium eutectic (γ+γ') and η phase. It has been reported that the addition of certain amount of Zr can modify precipitation of the nonequilibrium phases obviously, but the mechanism is still controversial. The effect of Zr ranging from <0.0006wt.％ to 0.150wt.％ on solidification behavior, segregation and microstructure of a Ni-based superalloy with high Al and Ti contents was investigated, eliminating the interferences of C and B. Results show that increase in Zr content significantly promotes the formation of eutectic (γ+γ'), η and Zr-rich phase in the interdendritic region. Besides the Zr-rich phase, Zr dissolves slightly in the eutectic γ' and obviously in the η phase. An interesting phenomenon is discovered that the Zr addition significantly increases the area fraction of liquid pools and enlarges the forming range of γ dendrites, which suggests that Zr markedly retards the solidification. Zr affects the eutectic (γ+γ') and η formation mainly due to the retard of solidification and dissolution of Zr in them. The retard of solidification obviously increases the residual liquid fraction and undercooling. Zr can serve as a forming element for the eutectic (γ+γ') and η phase, and the obvious dissolution of Zr in η phase significantly decreases the critical concentration of Ti for its precipitation.
文献关键词：
中图分类号：
作者姓名：
Guang-di Zhao;Xi-min Zang;Fang Liu;Wei-wei Zhang;Shuo Gao;Xue Li;Jing Guo
作者机构：
School of Materials and Metallurgy,University of Science and Technology Liaoning,Anshan 114051,Liaoning,China;Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China
文献出处：
引用格式：
[1]Guang-di Zhao;Xi-min Zang;Fang Liu;Wei-wei Zhang;Shuo Gao;Xue Li;Jing Guo-.Effect of Zr on solidification and microstructure of a Ni-based superalloy with high Al and Ti contents)[J].中国铸造,2022(01):17-26
A类：
0006wt,150wt
B类：
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AB值：
0.449085
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