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材料工程  2014, Vol. 0 Issue (6): 35-39    DOI: 10.11868/j.issn.1001-4381.2014.06.007
  材料与工艺 本期目录 | 过刊浏览 | 高级检索 |
热压形变参数对AZ31镁合金接头微观组织和力学性能的影响
初雅杰1,2, 李晓泉1, 吴申庆2, 徐振钦1, 杜舜尧1
1. 南京工程学院 材料工程学院, 南京 211167;
2. 东南大学 材料科学与工程学院, 南京 211189
Influence of Hot Compression Deformation on Microstructures and Mechanical Properties of Welded Joints for AZ31 Magnesium Alloy
CHU Ya-jie1,2, LI Xiao-quan1, WU Shen-qing2, XU Zhen-qin1, DU Shun-yao1
1. School of Material Engineering, Nanjing Institute of Technology, Nanjing 211167, China;
2. School of Material Science and Engineering, South East University, Nanjing 211189, China
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摘要 采用与母材同质的焊丝对AZ31镁合金板材进行手工钨极氩弧焊,利用真空热压炉及专门设计的夹装模具对焊接接头分别在250,300,350,400℃,应变速率为0.001s-1进行真空热压试验,通过电子拉伸试验仪、光学显微镜(OM)及扫描电镜(SEM)技术,研究镁合金焊接接头的力学性能和组织演化规律。结果表明:随着热压温度的升高,接头抗拉强度和伸长率不断增大,在350℃时,接头表现出最大的抗拉强度228MPa和伸长率10.2%,400℃时,强度和伸长率有所降低。在该工艺过程中,随着变形温度的升高,接头组织再结晶现象越来越明显,350℃时出现较多的动态再结晶核心和再结晶小晶粒,平均晶粒尺寸由46μm 细化至16μm左右,随着温度的升高,动态再结晶晶粒数量逐渐增加,400℃时,晶粒尺寸有所长大,平均晶粒尺寸为26μm,分布较均匀。
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初雅杰
李晓泉
吴申庆
徐振钦
杜舜尧
关键词 AZ31镁合金热压形变焊接接头显微组织    
Abstract:AZ31 magnesium alloy sheets were welded by manual TIG (tungsten insert gas) welding method with the same welding wire as filler material. The welded joints were compressed at 250,300,350,400℃ and strain rates of 0.001s-1 by a vacuum hot pressing furnace and a specially designed mold clamp. Microstructures and mechanical properties of welded joints with hot compression were analyzed by tensile test, optical metallographic microstructure (OM), scanning electronic microscopy (SEM). The results show that the tensile strength and elongation of the welded joint increase with the increasing temperature of hot compressing. The welded joint show the maximum tensile strength of 228MPa and elongation of 10.2% at 350℃, but lower at 400℃. The recrystallization phenomenon of joint is more and more obvious with the increasing deformation temperature in the process. Many dynamic recrystallization cores and small grains appear at 350℃ and the average grain size decreases from about 46μm to 16μm. As the temperature increases, the number of dynamic recrystallization grain is gradually increased. The grain size has grown up at 400℃, the average grain size is 26μm and evenly distributed.
Key wordsAZ31 magnesium alloy    hot compression deformation    welded joint    microstructure
收稿日期: 2012-11-14     
1:  TG146.2  
基金资助:国家自然科学基金资助项目(51075197);南京工程学院创新基金项目(CKJ2010004);南京工程学院博士基金项目(ZKJ201303)
通讯作者: 薛文斌(1968- ),男,教授,博士,主要从事材料表面改性研究,联系地址:北京师范大学核科学与技术学院(100875),E-mail:xuewb@bnu.edu.cn     E-mail: xuewb@bnu.edu.cn
作者简介: 初雅杰(1979- ),男,博士,现从事镁合金加工及焊接技术研究,联系地址:南京工程学院材料学院(211167),E-mail:yajiech@gmail.com
引用本文:   
初雅杰, 李晓泉, 吴申庆, 徐振钦, 杜舜尧. 热压形变参数对AZ31镁合金接头微观组织和力学性能的影响[J]. 材料工程, 2014, 0(6): 35-39.
CHU Ya-jie, LI Xiao-quan, WU Shen-qing, XU Zhen-qin, DU Shun-yao. Influence of Hot Compression Deformation on Microstructures and Mechanical Properties of Welded Joints for AZ31 Magnesium Alloy. Journal of Materials Engineering, 2014, 0(6): 35-39.
链接本文:  
http://jme.biam.ac.cn/jme/CN/10.11868/j.issn.1001-4381.2014.06.007      或      http://jme.biam.ac.cn/jme/CN/Y2014/V0/I6/35
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