Corner forming of AZ61A magnesium alloy tube within warm hydroforming  

作　　者：胡蓝 韩聪 何祝斌 汤泽军 刘钢 苑世剑 

机构地区：[1]National Key Laboratory of Precision Hot Processing of Metals,Harbin Institute of Technology

出　　处：《Journal of Harbin Institute of Technology(New Series)》2009年第2期227-231,共5页哈尔滨工业大学学报（英文版）

基　　金：Sponsored by the National Natural Science Foundation of China for Distinguished Young Scholars(Grant No. 50525516);the National Key Technology R&D Program (Grant No. 2006BAE04B03);Program for New Century Excellent Talents in University

摘　　要：The comers with small radii on cross sections are crucial for forming hydroformed components with polygonal sections. In this paper, warm hydroforming experiments of AZ61A magnesium alloy tubes were cartied out to study the forming regularity of round comers by using a demonstration part with square sections. Effects of temperature on radius forming, thinning ratio distribution and microstructure were revealed and a component with relative outer corner radius of 3.0 was obtained by warm hydroforming at 240℃. The minimum thickness of the formed square section was located in the transition position between the corner and the straight wall. The thinning ratio of the round corner increased with the increase of forming temperature. Fotmability of the magnesium tube was improved by raising temperature under the effect of dynamic recrystallization at 240℃.The corners with small radii on cross sections are crucial for forming hydroformed components with polygonal sections.In this paper,warm hydroforming experiments of AZ61A magnesium alloy tubes were carried out to study the forming regularity of round corners by using a demonstration part with square sections.Effects of temperature on radius forming,thinning ratio distribution and microstructure were revealed and a component with relative outer corner radius of 3.0 was obtained by warm hydroforming at 240℃.The minimum thickness of the formed square section was located in the transition position between the corner and the straight wall.The thinning ratio of the round corner increased with the increase of forming temperature.Formability of the magnesium tube was improved by raising temperature under the effect of dynamic recrystallization at 240℃.

关 键 词：warm hydroforming magnesium alloy thickness distribution 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TH137[金属学及工艺—金属材料]