Precipitation behavior during high-temperature isothermal compressive deformation of Inconel 718 alloy

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:677

Article

Zhang, Hongjun¹  Li, Chong¹  Liu, Yongchang¹  Guo, Qianying¹  Li, Huijun¹ 

[1] Tianjin Univ, Sch Mat Sci & Engn, State Key Lab Hydraul Engn Simulat & Safety, Tianjin 300354, Peoples R China

关键词: gamma ''-phase;    delta-phase;    Precipitation behaviors;    Isothermal deformation;    Inconel 718 alloy;   

DOI  :  10.1016/j.msea.2016.09.088

来源: Elsevier

【 摘 要 】

The precipitation behaviors of gamma '' and 5 phases during high-temperature isothermal compressive deformation of Inconel 718 alloy are investigated under the strain rate of 2.2.10(-4) s(-1). It is found that the precipitation behaviors are tailored by deformation temperatures, and lead to the disparately abnormal deformation characteristics. Under the deformation temperature of 800 degrees C, the microstructure is composed of incoherent needle-shaped gamma '' precipitates at grain boundaries and ultrafine spherical gamma '' particles within grains, resulting in the exceptional decrease of flow stress with absence of DRX. When deformed at 900 degrees C, it becomes needle-shaped delta precipitates at grain boundaries and intragranular disc-shaped gamma '' precipitates, and the DRX softening degree is lowered consequently. (C) 2016 Elsevier B.V. All rights reserved.

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