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High-temperature deformation of delta-processed Inconel 718
Journal of Materials Processing Technology ( IF 6.3 ) Pub Date : 2018-05-01 , DOI: 10.1016/j.jmatprotec.2017.12.014
Pedro Páramo-Kañetas , Utkudeniz Özturk , Jessica Calvo , José María Cabrera , Martha Guerrero-Mata

Abstract The hot-flow behavior of Inconel 718 subjected to delta processing (DP) was analyzed. Hot compression tests were subsequently performed at 960 °C and 1020 °C at the four different strain rates of 0.001, 0.01, 0.1, and 1 s−1. The two deformation temperatures were located below and above the δ-solvus of IN718 respectively. Microstructural characterization was performed by means of optical (OM) and scanning electron microscopy (SEM). The high temperature deformation results in the fragmentation of the existing δ-phase by means of partial dissolution and/or deformation, leading to an improved grain size control. A classic dynamic recrystallization (DRX) behavior was observed in the flow curves, which is typical of low-medium stacking fault energy (SFE) alloys. This flow behavior was modeled according to various approaches. Peak stress modeling was performed using two different approaches, referred to as ‘apparent’ and ‘physically-based’. The hot-flow behavior before the peak stress was modeled according to the Estrin-Mecking-Bergstrom approach, with Avrami kinetics employed to describe the DRX behavior.

中文翻译:

经delta处理的Inconel 718高温变形

摘要 对Inconel 718 经增量处理(DP) 后的热流行为进行了分析。随后在 960 °C 和 1020 °C 下以 0.001、0.01、0.1 和 1 s-1 四种不同的应变率进行热压缩试验。两个变形温度分别位于 IN718 δ-solvus 的下方和上方。通过光学 (OM) 和扫描电子显微镜 (SEM) 进行微观结构表征。高温变形通过部分溶解和/或变形导致现有 δ 相破碎,从而改善晶粒尺寸控制。在流动曲线中观察到经典的动态再结晶 (DRX) 行为,这是中低层错能 (SFE) 合金的典型特征。这种流动行为是根据各种方法建模的。峰值应力建模使用两种不同的方法进行,称为“表观”和“基于物理”。根据 Estrin-Mecking-Bergstrom 方法模拟峰值应力之前的热流行为,并使用 Avrami 动力学来描述 DRX 行为。
更新日期:2018-05-01
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