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| AZ33M变形镁合金激光焊接接头的组织和性能研究 |
| Microstructure and Properties of Wrought Magnesium Alloy AZ33M Laser Beam Welds |
| Received:October 28, 2019 Revised:January 10, 2020 |
| DOI：10.3969/j.issn.1674-6457.2020.01.019 |
| 中文关键词: AZ33M变形镁合金 激光焊接 微观组织 力学性能 |
| 英文关键词: wrought magnesium alloy AZ33M laser beam weld microstructure mechanical properties |
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| 中文摘要: |
| 目的 研究AZ33M变形镁合金激光焊接工艺及焊接接头的组织和性能。方法 通过对2 mm厚AZ33M变形镁合金板材进行激光焊接，采用金相显微镜、扫描电子显微镜、X射线衍射仪、万能试验机等研究了焊接接头的微观组织、物相组成、元素分布、力学性能，并研究了焊后均匀化处理对接头组织及性能的影响。结果 焊接接头的焊缝边缘晶粒形态以柱状晶为主；焊缝中含有α-Mg, Mg17Al12, MgZn, MgZn2, Mg7Zn3等5种物相。结论 通过调整焊接功率、焊接速度和离焦量可以获得力学性能与母材基本一致的焊接接头；中等功率焊接的焊接接头抗拉强度均能达到母材的95%以上，该变形镁合金焊接性能较优异。 |
| 英文摘要: |
| The paper aims to study the laser welding technology of AZ33M wrought magnesium alloy and the microstructure and properties of welded joints. In this paper, laser welding of AZ33M wrought magnesium alloy sheets with 2 mm thick was carried out. The microstructure, phase composition, element distribution, mechanical properties of welded joints were studied with OM, SEM, XRD and the influences of homogenization treatment after welding on microstructure and properties of welds were studied. The grains near the fusion line of all welded joints were mainly columnar crystals. There were five phases in the welding line, they were α-Mg, Mg17Al12, MgZn, MgZn2 and Mg7Zn3. The mechanical properties of the welded joints can be basically consistent with the base metal by adjusting the welding power, welding speed and defocusing amount. Tensile strength of the welded joints of medium power welding can reach more than 95% of that of the base metal, and the deformation magnesium alloy has excellent welding performance. |
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