(1. 江蘇大學(xué) 材料科學(xué)與工程學(xué)院，鎮(zhèn)江 212013；
2. 南京航空航天大學(xué) 機(jī)電工程學(xué)院，南京 210016；
3. Industrial Center, MATEKS Ltd, Moscow 121596，Russia；
4. 寶雞市博信金屬材料有限公司，寶雞 721013)
摘 要: 利用數(shù)控實(shí)驗(yàn)機(jī)床(CNC)、熱拉伸實(shí)驗(yàn)機(jī)和金相顯微鏡，研究了AZ31B鎂合金薄板在加熱時漸進(jìn)加工成形和顯微組織變化規(guī)律。結(jié)果表明：鎂合金薄板在加熱條件下可以實(shí)現(xiàn)單點(diǎn)漸進(jìn)成形，極限角隨著溫度的增加而增加，200 ℃時的成形極限角為60˚；各向異性對板料的漸進(jìn)成形影響較大，且250 ℃時合金各向異性最小；漸進(jìn)成形包括加工硬化、靜態(tài)再結(jié)晶和動態(tài)再結(jié)晶的復(fù)雜過程；板材的微觀組織由粗大和細(xì)小晶粒組成，這取決于板料的成形溫度和成形時間；板料質(zhì)量是影響鎂合金漸進(jìn)成形質(zhì)量的主要因素之一。
關(guān)鍵字: 鎂合金；漸進(jìn)成形；加熱；各向異性
（1. School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China;
2. College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
3. Industrial Center, MATEKS Ltd, Moscow 121596, Russia;
4. Baoji Boxin Metal Materials Ltd, Baoji 721013, China）
Abstract: 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.
Key words: magnesium alloy; incremental forming; heating; anisotropy
