| 轻合金板材超塑成形中的脉冲电流加热方法及其宏微观分析 |
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| 引用本文： | 李超,张凯锋,蒋少松.轻合金板材超塑成形中的脉冲电流加热方法及其宏微观分析[J].机械工程学报,2011,47(18). |
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| 作者姓名： | 李超 张凯锋 蒋少松 |
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| 作者单位： | 哈尔滨工业大学材料科学与工程学院 哈尔滨150001 |
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| 基金项目： | 中央高校基本科研业务费专项资金资助项目(HIT.KLOF.2010039) |
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| 摘 要： | 为提高轻合金板材超塑成形过程中的加热效率,降低能耗,提出一种脉冲电流快速加热方法。通过电热学理论及脉冲电流加热试验,系统研究电流密度对不同材料升温速率及最终加热温度的影响,并采取在电极处布置阻热片的措施,提高板材加热时温度场的均匀性;此外在微观层面,利用电热耦合有限元法及金相显微分析方法,简要分析加热过程中脉冲电流对轻合金板材内部裂纹、孔洞等缺陷及板材晶粒尺寸的影响。结果表明,由于加热时间极短,有效地避免板材内部晶粒的过度长大,并且高密度的脉冲电流可对板材原有缺陷起到一定的抑制作用。以AZ31镁合金超塑成形工艺为例进行试验验证,确定合理的脉冲电流加热参数,试验结果表明,与传统加热方法相比,采用脉冲电流直接加热方法,可有效提高加热效率、降低能耗。
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| 关 键 词： | 轻合金 电加热 加热速率 电流密度 |
Pulse Current Heating Method for Light Alloy Superplastic Forming and Macroscopic and Microscopic Effects Analysis |
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| LI Chao,ZHANG Kaifeng,JIANG Shaosong.Pulse Current Heating Method for Light Alloy Superplastic Forming and Macroscopic and Microscopic Effects Analysis[J].Chinese Journal of Mechanical Engineering,2011,47(18). |
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| Authors: | LI Chao ZHANG Kaifeng JIANG Shaosong |
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| Affiliation: | LI Chao ZHANG Kaifeng JIANG Shaosong(School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001) |
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| Abstract: | To improve the heating efficiency and reducing the energy consumption,a pulse current heating method for light alloy sheet hot forming has been purposed.Through the heating experiment in combination with the electrothermics theory,the effects of current density on the heating rate and the final temperature of the different metals have been investigated systematically.The temperature distribution became homogeneous by installing the resistance heat slice between the electrode and the heating blank.In the mic... |
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| Keywords: | Light metals Electric heating Heating rate Current density |
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