GH761合金的热变形行为与动态再结晶模型  

Flow Behavior and Dynamic Recrystallization Model for GH761 Superalloy during Hot Deformation

作　　者：刘鹏飞[1] 刘东[1] 罗子健[1] 孙文儒[2] 郭守仁[2] 胡壮麒[2] 

机构地区：[1]西北工业大学,陕西西安710072 [2]中国科学院金属研究所,辽宁沈阳110016

出　　处：《稀有金属材料与工程》2009年第2期275-280,共6页Rare Metal Materials and Engineering

摘　　要：采用Gleeble-3500热模拟试验机研究GH761合金在变形温度为900～1150℃,应变速率为0.1～30s-1条件下的热变形行为,建立了GH761合金在热态变形过程中的本构方程。采用Quantiment-500型自动图像分析仪定量测定试样中的动态再结晶晶粒尺寸和再结晶体积分数。根据实验结果,建立了GH761合金动态再结晶过程的物理模型,为科学设计和有效控制GH761合金的锻造工艺提供理论依据。The deformation behavior and evolution process of dynamic recrystallization for GH761 superalloy were studied with isothermal compression test in the temperature range of 950 ℃-1150 ℃ and the strain rate range of 0.1 s^-1-30 s^-1. The effect of thermodynamic parameters on flow stress was analyzed. A constitutive relationship was proposed based on the Arrhenius equation for the GH761 superalloy. The initiation and evolution of dynamic recrystallization were investigated with quantitive microstructure analysis. The volume fracture and grain size of dynamic recrystallization were established as functions of the Zener-Hollomon parameter. It is found that the calculation results of the proposed model are well agreed with the experimental data. Therefore, the proposed model can lay foundation of the quality control and process design for the forging process of GH761 superalloy.

关 键 词：GH761合金 本构方程 动态再结晶模型 晶粒尺寸 

分 类 号：TG146.4[一般工业技术—材料科学与工程]