Ni-25Cr-20Co合金时效组织结构及性能研究

doi:10.11896/j.issn.1005-023X.2017.016.022

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Abstract Based on Thermo-Calc software, the microstructure and mechanical properties of Ni-25Cr-20Co alloy after long-term aging at 750 ℃ was investigated using OM, SEM, TEM and tensile testing. The relationship between dislocation resistance mechanism and γ′ phase size was calculated. The results show that MC, M₂₃C₆ and γ′ phase are the main precipitates, the volume fraction of γ′ phase is 16%. The growth kinetic of γ′ phase follows LSW theory, affecting by the diffusion of solute atoms and interface energy of γ/γ′. The tensile strength increases obviously after aging treatment. The tensile strength decreases with the extending aging time. Deformation mechanism in stretching process is changed with the growth of γ′ phase. When γ′ phase is small, deformation mechanism is climb mechanism→cut mechanism→Orowan mechanism. Deformation mechanism switch to climb mechanism→Orowan mechanism→cut mechanism when γ′ phase exceed critical value.

Key words： Ni-25Cr-20Co alloy long-term aging microstructure γ′ phase deformation mechanism

Published: 25 August 2017 Online: 2018-05-07

CLC number:

TG113.12

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	Articles by authors
	WEI Limin
	YANG Quan
	CHENG Yi
	TAN Shuping

Cite this article:

WEI Limin,YANG Quan,CHENG Yi, et al. Microstructure and Properties of Ni-25Cr-20Co Alloy After Long-term Aging[J]. Materials Reports, 2017, 31(16): 107-111.

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https://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.016.022 OR https://www.mater-rep.com/EN/Y2017/V31/I16/107

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