摘要
利用数控实验机床(CNC)、热拉伸实验机和金相显微镜,研究了AZ31B镁合金薄板在加热时渐进加工成形和显微组织变化规律。结果表明:镁合金薄板在加热条件下可以实现单点渐进成形,极限角随着温度的增加而增加,200℃时的成形极限角为60°;各向异性对板料的渐进成形影响较大,且250℃时合金各向异性最小;渐进成形包括加工硬化、静态再结晶和动态再结晶的复杂过程;板材的微观组织由粗大和细小晶粒组成,这取决于板料的成形温度和成形时间;板料质量是影响镁合金渐进成形质量的主要因素之一。
The formability and microstructure evolution rules of AZ31B magnesium alloy thin sheet in the incremental forming at elevated temperature were investigated on CNC machine by hot tensile test machine and metallographic microscopy. The results show that, at elevated temperatures, the AZ31B magnesium alloy thin sheet can be formed by single-point incremental forming, the forming limit angle increases with increasing temperature, reaches 60° at 200 ℃. Anisotropy has a great impact on the sheet metal incremental forming and it reaches the minimum value at 250℃. Incremental forming is a complex process including work-hardening, static recrystallization and dynamic recrystallization. The microstructures of the sheet are composed of coarse and fine grains, which depend on the sheet metal forming temperature and time. The quality of magnesium alloy sheet is one of the main factors that affect the quality of the incremental forming.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2009年第5期800-807,共8页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金资助项目(50774037)
江苏大学资助项目(05JDG009)
关键词
镁合金
渐进成形
加热
各向异性
magnesium alloy
incremental forming
heating
anisotropy
