High-temperature elastic-plastic characteristics and constitutive model of aging strengthened high-nickel alloy Inconel-718

doi:10.13251/j.issn.0254-6051.2021.08.001

Abstract

Abstract: High-temperature elastic-plastic characteristics from 150 ℃ to 650 ℃ of aging strengthened 0Cr20Ni55Mo3Nb5Ti (Inconel-718) nickel-based alloy used for nuclear reactor spring were researched, and various functional models were used to fitting calculation and comparison of the constitutive relations based on the measured stress-strain data at high temperature. The results show that higher R_p0.01 value and room temperature elongation of the Inconel-718 alloy are obtained after 3-steps heat treatment of 970 ℃×1 h, air cooling+720 ℃×8 h, furnace cooling+620 ℃×8 h, air cooling. It is found that Boltzmann model has good fitting effect and prediction calculation precision for high-temperature σ-ε constitutive relations of the aging strengthened Inconel-718 alloy, so that it is also appropriate for the structure design and material selection for nuclear reactors.

Key words: aging strengthening, Inconel-718 alloy, elastic-plastic characteristics, constitutive model

CLC Number:

TG156.2

Qu Huapeng, Wang Liubing, Wang Donghui, Wu Bingjie, Feng Hanqiu, Xu Bin, Song Danrong, Lang Yuping. High-temperature elastic-plastic characteristics and constitutive model of aging strengthened high-nickel alloy Inconel-718[J]. Heat Treatment of Metals, 2021, 46(8): 1-7.

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