Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

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

Version 1 : Received: 6 May 2019 / Approved: 8 May 2019 / Online: 8 May 2019 (08:57:20 CEST)

A peer-reviewed article of this Preprint also exists.

Gao, B.; Sui, Y.; Wang, H.; Zou, C.; Wei, Z.; Wang, R.; Sun, Y. Effects of Cooling Rate on the Solidification and Microstructure of Nickel-Based Superalloy GTD222. Materials 2019, 12, 1920. Gao, B.; Sui, Y.; Wang, H.; Zou, C.; Wei, Z.; Wang, R.; Sun, Y. Effects of Cooling Rate on the Solidification and Microstructure of Nickel-Based Superalloy GTD222. Materials 2019, 12, 1920.

Abstract

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

Keywords

GTD222; nickel based superalloy; solidification behavior; cooling rate

Subject

Chemistry and Materials Science, Metals, Alloys and Metallurgy

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