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| Control on composition and characteristics of non-metallic inclusions in nickel-base superalloy |
| WANG Lin-zhu1, LI Xiang2, LIU Lu-kai1, YANG Shu-feng3, LI Jun-qi1 |
1. College of Materials and Metallurgy, Guizhou University, Guiyang 550025, Guizhou, China;
2. School of Materials and Energy Engineering, Guizhou Institute of Technology, Guiyang 550003, Guizhou, China;
3. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China |
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Abstract In order to explore the influence of aluminum and titanium contents on the composition, morphology, size, number, interfacial spacing and area density of inclusions in nickel-based superalloy, high-temperature experiments were carried out, and devices such as scanning electron microscope(SEM) with energy spectrometer(EDS) were used. The formation and evolution of inclusions were calculated and analyzed by using the classical thermodynamic calculation method and FactSage software. The results showed that the main components of the inclusions in the nickel-based superalloy were Al2O3, TixOy and TiN. The classical thermodynamic calculated results and FactSage software calculated results were consistent with the observed composition of inclusions. The size of inclusions was similar in high Al-Ti nickel-based superalloy and low Al-Ti nickel-based superalloy at the later smelting stage. However, the number of inclusions was significantly less, the interfacial spacing of inclusions was larger, and the distribution of inclusions was more homogeneous in the high Al-Ti nickel-based superalloys. The classical nucleation theory calculation indicated that the nucleation radius of inclusions in high Al-Ti alloy was three times larger than that in low Al-Ti alloy. In the case of the same combined oxygen, increasing the addition amount of Al-Ti was beneficial to decrease the number of nucleation, thereby increasing the interfacial spacing of inclusions, reducing the collision of inclusions, weakening the attraction between inclusions, and decreasing the aggregation between inclusions.
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Received: 29 September 2020
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2021, Vol. 31 
