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Superplastic Deformation and Dynamic Recrystallization of a Novel Disc Superalloy GH4151

机译：新型盘形高温合金GH4151的超塑性变形和动态再结晶

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The superplastic deformation of a hot-extruded GH4151 billet was investigated by means of tensile tests with the strain rates of 10 s , 5 × 10 s and 10 s and at temperatures at 1060 °C, 1080 °C and 1100 °C. The superplastic deformation of the GH4151 alloy was reported here for the first time. The results reveal that the uniform fine-grained GH4151 alloy exhibited an excellent superplasticity and high strain rate sensitivity (exceeded 0.5) under all experimental conditions. It was found that the increase of strain rate resulted in an increased average activation energy for superplastic deformation. A maximum elongation of 760.4% was determined at a temperature of 1080 °C and strain rate of 10 s . The average activation energy under different conditions suggested that the superplastic deformation with 1 × 10 s in this experiment is mainly deemed as the grain boundary sliding controlled by grain boundary diffusion. However, with a higher stain rate of 5 × 10 s and 1 × 10 s , the superplastic deformation is considered to be grain boundary sliding controlled by lattice diffusion. Based on the systematically microstructural examination using optical microscope (OM), SEM, electron backscatter diffraction (EBSD) and TEM techniques, the failure and dynamic recrystallization (DRX) nucleation mechanisms were proposed. The dominant nucleation mechanism of dynamic recrystallization (DRX) is the bulging of original grain boundaries, which is the typical feature of discontinuous dynamic recrystallization (DDRX), and continuous dynamic recrystallization (CDRX) is merely an assistant mechanism of DRX. The main contributions of DRX on superplasticity elongation were derived from its grain refinement process.
机译：通过拉伸试验，在1060°C，1080°C和1100°C的温度下，以10 s，5×10 s和10 s的应变速率进行拉伸试验，研究了热挤压GH4151钢坯的超塑性变形。首次报告了GH4151合金的超塑性变形。结果表明，在所有实验条件下，均匀的细晶粒GH4151合金均表现出优异的超塑性和高应变速率敏感性（超过0.5）。发现应变率的增加导致超塑性变形的平均活化能增加。在1080°C的温度和10 s的应变速率下测得的最大伸长率为760.4％。不同条件下的平均活化能表明，该实验中1×10 s的超塑性变形主要被认为是受晶界扩散控制的晶界滑动。但是，在5×10 s和1×10 s较高的污染率下，超塑性变形被认为是晶格扩散控制的晶界滑动。基于光学显微镜（OM），扫描电镜（SEM），电子背散射衍射（EBSD）和透射电子显微镜（TEM）技术对系统的显微组织检查，提出了失效和动态重结晶（DRX）成核机理。动态再结晶（DRX）的主要成核机理是原始晶界的隆起，这是不连续动态再结晶（DDRX）的典型特征，而连续动态再结晶（CDRX）只是DRX的辅助机理。 DRX对超塑性延伸的主要贡献来自其晶粒细化过程。

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