镍基高温合金GH4169高温变形流动应力模型研究  

STUDY OF FLOW STRESS MODEL OF THE NICKELBASED SUPERALLOY GH4169 AT HIGH TEMPERATURE DEFORMATION

作　　者：李淼泉[1] 姚晓燕[1] 罗皎[1] 林莺莺[1] 苏少博[2] 王海荣[2] 

机构地区：[1]西北工业大学材料学院,西安710072 [2]西安航空发动机(集团)有限公司,西安710021

出　　处：《金属学报》2007年第9期937-942,共6页Acta Metallurgica Sinica

基　　金：国家自然科学基金项目50475144;教育部首届"优秀青年教师"奖励基金项目CJ0402;西北工业大学基础研究基金项目NPU-FFR-006资助

摘　　要：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.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.

关 键 词：镍基高温合金 热模拟压缩 流动应力 模糊神经网络 流动应力模型 

分 类 号：TG311[金属学及工艺—金属压力加工] TB125[理学—工程力学]