陈芙蓉,赵永胜,邱小明,解瑞军.超声冲击处理对 7A52 铝合金焊接接头表层组织及性能的影响[J].表面技术,2015,44(6):49-53.
CHEN Fu-rong,ZHAO Yong-sheng,QIU Xiao-ming,XIE Rui-jun.Influence of Ultrasonic Impact Treatment on Microstructure and Properties of Surface Layer of 7A52 Aluminum Alloy Welded Joint[J].Surface Technology,2015,44(6):49-53
超声冲击处理对 7A52 铝合金焊接接头表层组织及性能的影响
Influence of Ultrasonic Impact Treatment on Microstructure and Properties of Surface Layer of 7A52 Aluminum Alloy Welded Joint
投稿时间:2015-01-04  修订日期:2015-06-20
DOI:10.16490/j.cnki.issn.1001-3660.2015.06.010
中文关键词:  超声冲击  7A52 铝合金  微观组织  显微硬度  耐磨性
英文关键词:ultrasonic impact treatment  7A52 aluminum alloy  microstructure  microhardness  wear resistance
基金项目:国家自然科学基金资助(51165026)
作者单位
陈芙蓉 内蒙古工业大学 材料科学与工程学院, 呼和浩特 010051 
赵永胜 内蒙古工业大学 材料科学与工程学院, 呼和浩特 010051 
邱小明 内蒙古工业大学 材料科学与工程学院, 呼和浩特 010051 
解瑞军 内蒙古工业大学 材料科学与工程学院, 呼和浩特 010051 
AuthorInstitution
CHEN Fu-rong School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohot 010051, China 
ZHAO Yong-sheng School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohot 010051, China 
QIU Xiao-ming School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohot 010051, China 
XIE Rui-jun School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohot 010051, China 
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中文摘要:
      目的 研究超声冲击处理对 7A52 铝合金焊接接头表层组织及性能的影响。 方法 用双丝 MIG焊接方法对 7A52 铝合金进行焊接,采用 UIT-125 型超声冲击机对其焊接接头进行全覆盖处理;通过金相显微镜,对超声冲击处理后的焊接接头组织变化规律进行观察分析;利用显微硬度计和磨擦磨损试验机测试研究其接头力学性能。 结果 超声冲击处理后,焊趾处形成相对连续、均匀、光滑的过渡圆弧,可以有效地缓解焊接接头的应力集中,7A52 铝合金焊接接头表面得到了明显强化,形成一层致密的塑性变形层,接头表面晶粒细化,母材的表层塑性变形厚度可达 15 μm 左右,热影响区的表层塑性变形厚度可达25 μm 左右,显微硬度和耐磨性显著提高。 结论 经超声冲击处理后,7A52 铝合金焊接接头表面的塑性变形层最厚处可达 20 μm 左右,形成了具有大致平行于焊接接头表面择优取向的形变织构。 沿厚度方向1. 5 mm 内,热影响区的硬度最高可达 162HV,焊缝区的最高硬度为 113HV,相比之前提高了 21. 5% , 表层的耐磨性得到较为明显的提高。
英文摘要:
      Objective To study the influence of ultrasonic impact treatment on microstructure and properties of surface layer of 7A52 alumium alloy welded joint. Methods 7A52 aluminum alloy was welded by double wire MIG welding method. The welded joint was full impacted by UIT-125 ultrasonic impact treatment equipment. Microstructure of the welded joint was observed and analyzed by metalloscope. The mechanical properties of welded joint were tested and studied by microhardness tester and wear testing machine. Results After ultrasonic impact treatment, continuous, uniform and smooth transition arc was formed in weld toe. The stress concentration of welded joints was alleviated. The thickness of surface deformation could reach 25 μm in heat affected zone and 15 μm in base metal. The surface 7A52 aluminum alloy welded joint by ultrasonic impact treatment equipment was obviously strengthened. Denser plastic deformation layer was induced. Surficial grains were refined. The microhardness and wear resistance were significantly increased. Conclusion After UIT, the maximum thickness of surface layer of 7A52 aluminum alloy welded Joint was about 20 μm, and the deformation texture with preferred oriention was formed and parallel to surface of welded joint. Along the thickness direction within 1. 5 mm, the maximum microhardness was 162HV in heat affected zone of the weld zone, 113HV in the weld zone, which were improved by 21. 5% comparing to these without treatment. Moreover, the wear resistance of the surface layer were obviously improved.
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