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Microstructures Evolution of a Ni-Base Superalloy after Long-Term Aging at 750°C
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Microstructures Evolution of a Ni-Base Superalloy after Long-Term Aging at 750°C

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Abstract:

The microstructures evolution of a new type Ni-base superalloy has been investigated after long-term aging at 750°C for 2000h. The results indicate that TCP, a harmful phase greatly affects the mechanical properties of the alloy, is un-precipitated in the aging process. γ´ phase is precipitated in two kinds of sizes during long-term aging. The shape of larger one is transit from spherical to cubic with prolonging of aging time. The M23C6 carbide formed mainly by Cr, and other elements such as Al, Ti, Co and Mo is also precipitated in both γ matrix and grain boundaries, and the quantities of the carbide increase gradually with the increasing of aging time.

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Periodical:

Materials Science Forum (Volumes 561-565)

Pages:

387-390

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.561-565.387

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Online since:

October 2007

Authors:

Tong Cui, Ji Jie Wang, Li Qing Chen, Guang Pu Zhao, Hong Cai Yang

Keywords:

Carbide, Long Term Aging, Nickel-Based Superalloy, TCP Phase

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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