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Hot deformation behavior and processing map of a γ′-hardened nickel-based superalloy

机译：γ'硬化镍基高温合金的热变形行为及加工图

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摘要

The hot deformation behavior of a γ′-hardened nickel-based superalloy was investigated by means of isothermal compression tests in the temperature range of 1010-1160 ℃ and strain rate range of 0.001-1 s~(-1) The results show that the hot activation energy of the alloy is about 427.626 kJ/mol. On the basis of experimental data, processing maps were developed by utilizing the principles of the dynamic materials model (DMM). The processing maps exhibit one domain with high efficiency of power dissipation. At the strain of 0.6, the domain occurs in the temperature range of 1105-1160 ℃ and strain rate range of 0.02-0.25 s~(-1) with a peak efficiency of about 42.2%. Microstructure observations reveal that full dynamic recrystallization (DRX) occurred in the domain. In the processing maps, the curvature changes of the isoefficiency contours occur in the temperature range of 1080-1090 ℃, which is at the dissolution temperature of γ′ phase in the alloy. Moreover, it can be found that the strain has an effect on the efficiency of power dissipation. The efficiency value increases with increasing strain in the high strain rate domain (0.1-1 s~(-1)), while the efficiency value decreases with increasing strain in the high temperature (1080-1160 ℃) and low strain rate (0.001-0.01 s~(-1)) domain. The flow instability is predicted to occur in the high strain rate domain, which is manifested as adiabatic shear bands.
机译：通过等温压缩试验，在1010-1160℃的温度范围和0.001-1 s〜（-1）的应变速率范围内研究了γ'-硬化的镍基高温合金的热变形行为。合金的热活化能约为427.626kJ / mol。在实验数据的基础上，利用动态材料模型（DMM）的原理开发了加工图。处理图展示了一个具有高功耗效率的域。在0.6的应变下，该区域出现在1105-1160℃的温度范围内，应变速率范围为0.02-0.25 s〜（-1），峰值效率约为42.2％。微观结构观察表明，在域中发生了完全动态重结晶（DRX）。在加工图中，等效率线的曲率变化发生在1080-1090℃的温度范围内，该温度范围是合金中γ'相的溶解温度。此外，可以发现，应变对功耗的效率有影响。在高应变率域（0.1-1 s〜（-1））中，效率值随应变的增加而增加，而在高温（1080-1160℃）和低应变率（0.001-0.1 s）中，效率值随应变的增加而减小。 0.01 s〜（-1））域。预计流动不稳定性将在高应变率域中发生，这表现为绝热剪切带。

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