摘要
半固态成形是21世纪最具潜力的先进制造技术之一。分析了国内外半固态变形行为研究进展,重点阐述了近似单相本构关系模型、两相本构关系模型、宏观-微观耦合本构关系模型的特点及应用,特别是笔者提出的宏观-微观耦合本构关系模型反映了工艺参数和微观组织参数对半固态流变应力的影响。同时,笔者将新型宏观-微观耦合本构关系模型应用于Al-4Cu-Mg合金半固态反挤压过程的有限元数值模拟,获得了工艺参数对应力应变、温度、晶粒尺寸、液相体分数和挤压载荷等的影响规律,数值模拟结果与半固态实验结果基本一致。
Semi-solid forming is one of the most advanced materials processings in the 21th century. In this paper, advances in deformation behavior of the semi-solid forming at home and abroad are analyzed, it is important to clarify the correlation mechanism and models including the quasi-single phase constitutive equation, two-phase constitutive equation and macro-micro coupling constitutive equation, especially the present macro-micro coupling constitutive equation represents the influence of technological parameters and microstructure variables on the flow stress in semi-solid forming. Furthermore, novel macro-micro coupling constitutive equation is applied to simulate the semi-solid back extrusion of Al-4Cu-Mg aluminium alloy and the effects of techonological parameters on flow stress, strain, temperature rise, grain size, volume fraction of liquid pahse and extrusion load are investigated. Moreover, the simulation results are in a good agreement with the experimental results.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2009年第3期1-5,共5页
Materials Reports
关键词
半固态
变形
微观组织
模型
semi-solid, metal forming, microstructure, models
