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Materials (Basel). 2019 Jun 14;12(12). pii: E1920. doi: 10.3390/ma12121920.

Effects of Cooling Rate on the Solidification and Microstructure of Nickel-Based Superalloy GTD222.

Author information

1
National Key Laboratory for Precision Hot Processing of Metals, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China. gaobolaile@126.com.
2
National Key Laboratory for Precision Hot Processing of Metals, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China. yanfei0620@sina.com.
3
National Key Laboratory for Precision Hot Processing of Metals, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China. wanghw@hit.edu.cn.
4
National Key Laboratory for Precision Hot Processing of Metals, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China. zouchunming1977@163.com.
5
National Key Laboratory for Precision Hot Processing of Metals, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China. weizj@hit.edu.cn.
6
Shanghai Key Laboratory of Advanced High-Temperature Materials and Precision Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China. wangrui1029@sjtu.edu.cn.
7
Shanghai Key Laboratory of Advanced High-Temperature Materials and Precision Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China. sunyanle313@sjtu.edu.
8
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China. sunyanle313@sjtu.edu.

Abstract

In this work, the microstructure and solidification behavior of nickel-based superalloy GTD222 at different cooling rates are studied. The solidification of the superalloy GTD222 proceeds as follows: L → L + γ, L → L + γ + MC, L → L + (γ/γ')-Eutectic and L → η phase. Due to alloying element redistribution, the temperature of the solidus GTD222 superalloy, 1310 °C, is slightly lower than the temperature of the liquidus, which is 1360 °C. It was found that the dendrite arm spacing of the alloy decreased with the increase of the cooling rate from 200 μm at 2.5 K/min to 100 μm at 20 K/min.

KEYWORDS:

GTD222; cooling rate; nickel-based superalloy; solidification behavior

PMID:
31197116
DOI:
10.3390/ma12121920
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