碳含量对热等静压FGH4169合金原始颗粒边界与力学性能的影响

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Abstract Three types of FGH4169 alloy with carbon mass fraction of 0.026%, 0.045% and 0.078% were prepared by hot-isostatic pressing (As-HIP) and heat treatment. The effects of carbon content on the original particle boundary (PPB) and mechanical properties of FGH4169 alloy were investigated. The results show that, with the carbon content increases from 0.026% to 0.078%, the precipitated carbide of FGH4169 alloy increases, and when the carbon content exceeds 0.078%, the PPB formed. The carbides in FGH4169 alloy are mainly MC type carbides rich in Ti and Nb, and the carbon content has no obvious effect on the type and morphology of carbides in FGH4169 alloy; Within a certain range of the C content, as the C content increases, the amount of γ″ phase precipitated in the FGH4169 alloy matrix decreases, and the carbides tend to aggregate at the PPB, resulting in the strength and plasticity gradually decreasing under room temperature and 650 ℃.

Key words： FGH4169 carbon content PPB mechanical properties HIP

Received: 17 January 2018 Published: 12 July 2019

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