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

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 redistri...

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Detalles Bibliográficos
Autores principales: Gao, Bo, Sui, Yanfei, Wang, Hongwei, Zou, Chunming, Wei, Zunjie, Wang, Rui, Sun, Yanle
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6631751/
https://www.ncbi.nlm.nih.gov/pubmed/31197116
http://dx.doi.org/10.3390/ma12121920
Descripción
Sumario: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.

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