镍基高温合金GH4169高温变形流动应力模型研究

镍基高温合金GH4169热模拟压缩实验结果表明:变形温度的升高和应变速率的减小使该合金高温变形时的峰值应力和稳态应力显著降低,变形温度会影响其进入稳态变形时变形程度的大小.基于高温合金GH4169高温变形时的流动应力特征,运用模糊神经网络理论建立了该合金高温变形时的流动应力模型.计算与实验的流动应力的最大误差为10.18%,平均误差为2.11%,该模型的计算精度明显高于由回归法建立的高温合金GH4169高温变形时的流动应力模型.

Modeling for flow stress of the nickel-based GH4169 superalloy at high temperature deformation

Isothermal compression test for a nickel-based superalloy GH4169 has been carried out at a Thermecmaster-Z simulator. According the analysis of experimental results, the peak stress and steady stress significantly decreased with increasing of the deformation temperature and decreasing of the strain rate, and the deformation temperature would also affect the critical value of strain to reach the steady flow at the high temperature deformation. Meanwhile, a model for flow stress of the alloy at high temperature deformation has been established in terms of the fuzzy artificial neural network. The maximum difference between the calculated and the experimental results is 10.18%, the average difference is 2.11%. The calculated precision is better than that through the regression method.