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

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• 作者：Hongjun Zhang ; Chong Li ; Yongchang Liu ; ^{licmtju@163.com" class="auth_mail" title="E-mail the corresponding author} ; Qianying Guo ; Huijun Li
• 关键词：γ&Prime ; -phase ; δ-phase ; Precipitation behaviors ; Isothermal deformation ; Inconel 718 alloy
• 刊名：Materials Science & Engineering A
• 出版年：2016
• 出版时间：20 November 2016
• 年：2016
• 卷：677
• 期：Complete
• 页码：515-521
• 全文大小：3143 K

文摘

The precipitation behaviors of γ″ and δ 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 °C, the microstructure is composed of incoherent needle-shaped γ″ precipitates at grain boundaries and ultrafine spherical γ″ particles within grains, resulting in the exceptional decrease of flow stress with absence of DRX. When deformed at 900 °C, it becomes needle-shaped δ precipitates at grain boundaries and intragranular disc-shaped γ″ precipitates, and the DRX softening degree is lowered consequently.