Activation Energy for Superplastic Flow Above Critical Temperature of Die Steels

作     者：WEN Jiu-ba ZHANG Ke-ke CHEN Fu-xiao YANG Yong-shun 

作者机构：School of Materials Science and Engineering Henan University of Science and Technology Luoyang 471003 Henan China 

出 版 物：《Journal of Iron and Steel Research International》 (国际钢铁研究杂志)

年 卷 期：2006年第13卷第5期

页      面：4-6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：superplasticity superplastic working activation energy 

摘      要：Some commercial cold working die steels C.,Cr15 and CrWMn with ultra fine grain size were chosen as tested materials to research the activation energy for superplastic flow at different temperatures and strain rates above critical temperature. Based on the Arrhenius equation, the activation energy for superplastic flow is evaluated. The activation energy at constant strain rate is estimated by the logσ, vs 1/T relationship. The results show that the ac tivation energy is usually small under the conditions of optimal flow. The characteristics of superplastic deformation of steels above the critical temperature were also analyzed.