连续铸轧流变行为及其组织演变规律  

Rheological behavior and microstructure evolution of continuous roll-casting process

作　　者：湛利华[1] 钟掘 李晓谦[1] 黄明辉[1] 

机构地区：[1]中南大学机电工程学院,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2006年第1期108-113,共6页Journal of Central South University:Science and Technology

基　　金：国家重大基础研究发展规划"973"项目(19990604906)

摘　　要：在Gleeble-1500热/力机上用专制的夹具系统对铝合金铸轧过程流变行为及其影响因素进行模拟实验研究,得到不同变形条件下铝合金瞬态凝固连续固态流变成形过程中的形变规律。研究结果表明:在较低的应变速率(.ε<0.1 s-1)下,材料不发生动态再结晶现象;而在较高应变速率(.ε>0.5 s-1)下,材料出现再结晶显微组织;模拟铸轧实验过程中得到的材料高温变形抗力大于同样变形条件下热轧模拟得到的稳态流变应力,这与快凝铸轧工艺的工业实验结果相吻合,说明本研究的专制工装与实验系统能基本实现铸轧工艺的物理模拟。A series of simulating experiments on the rheological behavior and its influencing factors in continuous roll-casting process were studied by Gleeble-1500 thermal-mechanical simulation tester and a set of special clamp system. Relevant theological rules in the process of coupled transient solidification and continuous deformation of roll-casting conditions were obtained. The results show that under the condition of lower strain rate （ε^.20. 1 s^-1 ）, dynamic recrystallization microstructure can not be acquired, while at higher strain rate （ε^.〉0. 5 s^- 1 ） such microstructure can be obtained, which tallies with the result of industrial trial of high speed roll-casting process. And the deformation resistance of continuous roll-casting simulation process is greater than that of hot roiling simulation process under the same experimental conditions. At the same time, the special clamp and experimental system can basically realize the physical simulation of roll-casting process.

关 键 词：连续铸轧 流变行为 物理模拟 变形抗力 组织演变 

分 类 号：TG146[一般工业技术—材料科学与工程]