Study on the Evolution of the γ′ Phase and Grain Boundaries in Nickel-Based Superalloy during Interrupted Continuous Cooling

Wang, Haiping; Liu, Dong; Wang, Jianguo; Yang, Yanhui; Rao, Haodong; Wang, Hai; Nan, Jungang; Wang, Longxiang

doi:10.3390/cryst11121464

Open AccessArticle

Study on the Evolution of the γ′ Phase and Grain Boundaries in Nickel-Based Superalloy during Interrupted Continuous Cooling

by

Haiping Wang

^1,*,

Dong Liu

¹,

Jianguo Wang

^1,*,

Yanhui Yang

¹,

Haodong Rao

¹,

Hai Wang

¹,

Jungang Nan

¹ and

Longxiang Wang

²

¹

State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China

²

Avic Heavy Machinery Co., Ltd., Guizhou 520100, China

^*

Authors to whom correspondence should be addressed.

Crystals 2021, 11(12), 1464; https://doi.org/10.3390/cryst11121464

Submission received: 24 October 2021 / Revised: 23 November 2021 / Accepted: 24 November 2021 / Published: 26 November 2021

(This article belongs to the Topic Single-Crystal Ni-Based Alloys)

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Abstract

The formation of the irregular γ′ precipitates in the nickel-based superalloy Waspaloy was investigated during the continuous cooling, which is relevant to the cooling rates and interrupted temperature. The morphology of the γ′ precipitates was observed to change from a dispersed sphere to the flower-like one with the decreasing of the cooling rates. It was found that there are three modes of transportation of the solute atoms involved in relation to the γ′ precipitates: dissolution from the small γ′ precipitates to the γ matrix, diffusion to the large γ′ precipitates from the matrix, and the short distance among γ′ precipitates close to each other. Meanwhile, the slower cooling rates tend to result in the serrated grain boundaries, and the wavelength between successive peaks (λ) and the maximum amplitude (A) are larger with the decreasing of the cooling rates. The content of the low ΣCSL boundaries increases with the decreasing of the cooling rates, which is of great benefit in improving the creep property of the Waspaloy.

Keywords: Waspaloy; continuous cooling; γ′ precipitates; serrated grain boundaries; creep property

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MDPI and ACS Style

Wang, H.; Liu, D.; Wang, J.; Yang, Y.; Rao, H.; Wang, H.; Nan, J.; Wang, L. Study on the Evolution of the γ′ Phase and Grain Boundaries in Nickel-Based Superalloy during Interrupted Continuous Cooling. Crystals 2021, 11, 1464. https://doi.org/10.3390/cryst11121464

AMA Style

Wang H, Liu D, Wang J, Yang Y, Rao H, Wang H, Nan J, Wang L. Study on the Evolution of the γ′ Phase and Grain Boundaries in Nickel-Based Superalloy during Interrupted Continuous Cooling. Crystals. 2021; 11(12):1464. https://doi.org/10.3390/cryst11121464

Chicago/Turabian Style

Wang, Haiping, Dong Liu, Jianguo Wang, Yanhui Yang, Haodong Rao, Hai Wang, Jungang Nan, and Longxiang Wang. 2021. "Study on the Evolution of the γ′ Phase and Grain Boundaries in Nickel-Based Superalloy during Interrupted Continuous Cooling" Crystals 11, no. 12: 1464. https://doi.org/10.3390/cryst11121464

APA Style

Wang, H., Liu, D., Wang, J., Yang, Y., Rao, H., Wang, H., Nan, J., & Wang, L. (2021). Study on the Evolution of the γ′ Phase and Grain Boundaries in Nickel-Based Superalloy during Interrupted Continuous Cooling. Crystals, 11(12), 1464. https://doi.org/10.3390/cryst11121464

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Study on the Evolution of the γ′ Phase and Grain Boundaries in Nickel-Based Superalloy during Interrupted Continuous Cooling

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