| AZ31镁合金氦-氩混合气体TIG焊接头组织和力学性能研究 |
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| 引用本文： | 刘胜新,陈永,汪喜和,刘晓芳,李庆奎,关绍康. AZ31镁合金氦-氩混合气体TIG焊接头组织和力学性能研究[J]. 热加工工艺, 2007, 36(7): 12-14 |
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| 作者姓名： | 刘胜新 陈永 汪喜和 刘晓芳 李庆奎 关绍康 |
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| 作者单位： | 郑州大学,材料科学与工程学院,河南,郑州,450002 |
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| 基金项目： | 河南省自然科学基金;河南省郑州市科技攻关项目 |
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| 摘 要： | 以氦-氩混合气体为保护气氛，对AZ31镁合金板材进行了TIG焊，并对焊接接头的显微组织、力学性能进行了测试。结果表明，焊缝区全部由均匀细小的等轴晶组成，热影响区组织较粗大；热影响区的硬度明显比母材低，焊缝区的显微硬度和母材相近；焊件的抗拉强度为母材的68．6％，断裂发生在热影响区，属于韧-脆混合断裂。
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| 关 键 词： | 镁合金 焊接 氦-氩混合气体 力学性能 |
| 文章编号： | 1001-3814（2007）01-0012-02 |
| 修稿时间： | 2007-02-05 |
Study on Microstructure and Mechanical Properties of He-Ar Mixed Gas TIG Welded Joint for AZ31 Magnesium Alloy Plates |
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| LIU Sheng-xin,CHEN Yong,WANG Xi-he,LIU Xiao-fang,LI Qing-kui,GUAN Shao-kang. Study on Microstructure and Mechanical Properties of He-Ar Mixed Gas TIG Welded Joint for AZ31 Magnesium Alloy Plates[J]. Hot Working Technology, 2007, 36(7): 12-14 |
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| Authors: | LIU Sheng-xin CHEN Yong WANG Xi-he LIU Xiao-fang LI Qing-kui GUAN Shao-kang |
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| Affiliation: | School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450002, China |
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| Abstract: | Taking the He-Ar mixed gas as protected atmosphere, TIG welding for AZ31 magnesium alloy plate was carried out. The microstructure and mechanical properties of the welded joint were examined. The results show that the microstructure in welded seam zone consists of finer exquiaxed grains, and the microstructure in heat-affected zone is coarser.The microhardness in heat-affected zone is obviously lower than that in the matrix, and the microhardness in welded seam zone is almost the same as that in the matrix.The tensile strength of the welded joint is about 68.6% of the matrix. The fracture point occurs in the heat-affected zone,which belongs to the mixed fracture of toughness and brittleness. |
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| Keywords: | magnesium alloy welding TIG He-Ar mixed gas mechanical properties |
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