A phenomenological constitutive equation for Rene 95 PM alloy and its application to isothermal forging process of turbine disk

作     者：Maicang Zhang, Jianxin Dong, Yanping Zeng, Xishan XieMaterials Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China 

作者机构：Mat. Sci. and Eng. Sch. Univ. of Sci. and Technol. Beijing Beijing 100083 China 

出 版 物：《Journal of University of Science and Technology Beijing》 (北京科技大学学报（英文版）)

年 卷 期：2002年第9卷第4期

页      面：282-286页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

主　　题：constitutive equation finite element method isothermal forging Rene 95PM alloy 

摘      要：The flow behavior of Rene 95 PM alloy was studied from 1050 to 1150 deg Cwith strain rate of 1 X 10^(-3), 1 X 10^(-2), 1 X 10^(-1) and 1 s^(-1). At a given temperature andstrain rate, flow curves exhibit a peak followed by flow softening up to a steady state. Moreover,at constant strain, flow stress increases with increasing strain rate and decreasing temperature. Anequation relating hyperbolic sine of flow stress to hot working parameters, such as strain, strainrate and temperature, was established by using multiple nonlinear regression method. A very goodagreement was found between predicted and experimental flow stress in all the strain rangeinvestigated. Application of the constitutive equation in predicting forming loads and flow behaviorand temperature distribution in both upper and lower dies in an isothermal forging process ofturbine disk of large dimension (about 630 mm) by means of a finite element code was systematicallyanalyzed.