镦拔对Al-Zn-Mg-Cu合金变形和组织的影响  

Influence of upsetting and drawing on deformation and microstructure of Al-Zn-Mg-Cu alloy

作　　者：白林振[1] 陈慧琴[1] 

机构地区：[1]太原科技大学材料科学与工程学院,山西太原030024

出　　处：《锻压技术》2011年第4期134-137,147,共5页Forging & Stamping Technology

基　　金：国家重点基础研究基金资助项目(973)(2005CB623705)

摘　　要：采用有限元软件Deform-3D对一种新型Al-Zn-Mg-Cu系高强铝合金进行了镦粗、拔长和镦拔连续变形实验研究,获得了变形体内部微观组织演变规律及应变分布规律。分析结果表明:相同锻比条件下,镦粗变形体内大部分区域的等效应变值在0.4～1.68之间,中心大变形区的组织以拉长晶粒为主,并有少许再结晶晶粒,其它区域的组织沿变形方向发生不同程度的变形;拔长变形体内大部分区域的等效应变值在0.74～1.96之间,组织均发生较剧烈变形,拉长的原始晶粒组织周围存在细小的再结晶新晶粒,等效应变值较高且变形更加均匀;总锻比相同的镦拔连续变形条件下,拔长分锻比大于镦粗分锻比时的等效应变较高,组织细小均匀。研究结果对实际生产有一定的指导意义。Finite element software Deform-3D was used to simulate the upsetting,drawing and upsetting-drawing of Al-Zn-Mg-Cu alloy.And strain distribution in the deformed billets was obtained.The results of simulation and tests show that at the same forging reduction,the value of effective strain in the upsetting billet is in the range of 0.4-1.68.And the organization in the large deformation are prolonged grains with fewer re-crystallized new grains in the center,different degree of deformation grains are observed in the other locations;the value of effective strain in the drawing billet is in the range of 0.74-1.96.Microstructure subjected to large deformation,and more prolonged grains with re-crystallized new grains are presented.It also has taller effective strain than upsetting.At the same overall forging reduction,when the forging reduction of drawing is bigger than that of upsetting,the higher value of strain,uniform and smaller microstructure can be obtained.The results have a certain guiding significance for production practice.

关 键 词：AL-ZN-MG-CU合金 变形 显微组织 镦粗 拔长 

分 类 号：TG319[金属学及工艺—金属压力加工]