High temperature rupture properties of A286 alloy

doi:10.13251/j.issn.0254-6051.2023.03.030

Heat Treatment of Metals ›› 2023, Vol. 48 ›› Issue (3): 179-187.DOI: 10.13251/j.issn.0254-6051.2023.03.030

• MICROSTRUCTURE AND PROPERTIES • Previous Articles Next Articles

High temperature rupture properties of A286 alloy

Deng Shanshan^1,2, Sun Yongqing², Jiang Yehua¹, Liu Zhenbao², Liang Jianxiong², Wang Changjun²

1. Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming Yunnan 650093, China;
2. Institute of Special Steels, Center Iron and Steel Research Institute Company limited, Beijing 100081, China

Received:2022-10-15 Revised:2023-01-27 Online:2023-03-25 Published:2023-04-25

Abstract

Abstract: In order to investigate high temperature rupture properties of A286 alloy, the high temperature rupture tests of the A286 alloy prepared by electric arc furnace+ladle furnace+vacuum arc remelting (EAF+LF+VAR) smelting process at different temperatures and stresses were carried out, and the Larson-Miller parameter (LMP) was used to predict the rupture life of the A286 alloy, the microstructure evolution of fracture was analyzed. The results show that the relationship between stress and LMP is σ=-107.30×LMP+3011.02. The fracture mode of the A286 alloy changes from ductile fracture consisting of tough nests and holes to brittle fracture intergranular fracture as the testing temperature decreases. At high stress and low temperature, cracks are mainly generated at MC and M₂₃C₆, while at low stress and high temperature, cracks are mainly generated at lamellar η phase. The strengthening mechanism at testing temperature of 650 ℃ and stress of 450 MPa is mainly precipitation strengthening by dislocation cutting through the γ′ phase. The strengthening mechanism at testing temperature of 750 ℃ and stress of 150 MPa is precipitation strengthening by dislocation cutting through the γ′ phase and dispersion strengthening by dislocation passing the γ′ phase. The nanoparticles such as TiP₂, (Ti, Nb)C, TiC, and NbC precipitated in the grains are favorable to the high temperature rupture properties.

Key words: A286 alloy, high temperature rupture properties, Larson-Miller parameter, creep mechanism

CLC Number:

TG142.1⁺2

Deng Shanshan, Sun Yongqing, Jiang Yehua, Liu Zhenbao, Liang Jianxiong, Wang Changjun. High temperature rupture properties of A286 alloy[J]. Heat Treatment of Metals, 2023, 48(3): 179-187.

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High temperature rupture properties of A286 alloy

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