热压对镁合金焊接接头拉伸性能的影响
Effect of Hot-Press on Tensile Properties of Welded Joints of Magnesium Alloy
摘 要
通过拉伸试验机、光学显微镜、扫描电镜等研究了热压对AZ31B镁合金钨极氩弧焊焊接接头拉伸性能和断口形貌的影响。结果表明: 热压后焊接接头的抗拉强度和伸长率分别可达200 MPa和10%, 比焊态的分别提高了18%和67%; 焊态接头拉伸断口以解理断裂为主, 呈现出较多的脚印状小平台, 同时伴随有少量韧窝; 而热压后焊接接头的断口具有平台撕裂畸变现象, 可以观察到热压塑性变形流变线, 晶界表现出一定的滑动协调现象。
热压
力学性能
焊接接头
magnesium alloy
hot-press
mechanical property
welded joint
Abstract
The effects of hot-press on tensile properties and fracture morphology of AZ31B magnesium alloy welded joint welded by argon tungsten-arc welding were studied by tensile test, optical microscopy and scanning electron microscopy. The results show that the tensile strength and elongation of welded joint after hot-press were 200 MPa and 10%, respectively, and increased by 18% and 67% comparing with that of welded joint before hot-press. The tensile fracture of welded joint was mainly cleavage and more footmark platforms, accompanied by small amount of dimples. The fracture of hot-pressed joint showed the characteristics of quasi-cleavage fracture with plastic deformation flow lines, and the grains boundaries showed the phenomenon of sliding coordination.
中图分类号 TG146.2
所属栏目 试验研究
基金项目 南京工程学院科研基金资助项目(QKJA2010002); 江苏省自然科学基金资助项目(BK2009354); 大学生科技创新基金资助项目(N20090219)
收稿日期 2011/3/11
修改稿日期 2011/12/10
网络出版日期
作者单位点击查看
备注初雅杰(1979-), 男, 山东烟台人, 博士研究生。
引用该论文: CHU Ya-jie,LI Xiao-quan,WU Shen-qing,CHENG Hai-xia. Effect of Hot-Press on Tensile Properties of Welded Joints of Magnesium Alloy[J]. Materials for mechancial engineering, 2012, 36(2): 24～27
初雅杰,李晓泉,吴申庆,程海霞. 热压对镁合金焊接接头拉伸性能的影响[J]. 机械工程材料, 2012, 36(2): 24～27
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参考文献
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【4】孙德新, 孙大千, 李金宝, 等.镁合金焊接技术的研究进展及应用[J].材料导报, 2006, 20(8):122-127.
【5】于建民, 张治民, 张宝红.塑性变形对AZ31镁合金晶粒细化的影响[J].热加工工艺, 2009, 38(15):11-14.
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【7】罗君, 刘政军, 苏允海, 等.纵向直流磁场对AZ31镁合金TIG焊焊接接头组织及性能的影响[J].焊接学报, 2007, 28(7):53-59.
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