转速对20 mm厚2219铝合金搅拌摩擦焊接件的组织及性能的影响
作者:
作者单位:

1.首都航天机械有限公司,北京 100076;2.火箭军装备部驻北京地区第一军事代表室,北京 100076

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中图分类号:

TG453.9

基金项目:

山东省自然科学基金重点项目(ZR2020KE022);国家自然科学基金面上项目(5217052208);济南市科研带头人工作室项目(2019GXRC054)


Effect of Rotation Speed on Microstructure and Properties of 20 mm Thick AA2219 Friction Stir Welded Plates
Author:
Affiliation:

1.Capital Aerospace Machinery Co. Ltd, Beijing 100076;2.The First Military Representative Office of the Armed Forces in Beijing, Beijing 100076

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    摘要:

    对20 mm厚的2219 C10S铝合金板材进行搅拌摩擦焊对接试验,在进给速度为100 mm/min的条件下,对比研究转速为400~550 r/min时的对接接头的内部缺陷、宏观形貌及微观组织、显微硬度和拉伸力学性能的差异。结果表明,当转速为400~500 r/min时,焊接接头无缺陷,能获得内部质量较高的焊接接头。随着转速的增加,焊核区“洋葱环”的间距和轴肩影响区的范围增大,焊核区和热力影响区的硬度的降低越明显。接头的拉伸性能随转速的增大而降低,拉伸强度最高可达到334 MPa,接头断裂模式主要为韧性断裂,断裂位置发生在后退侧的热力影响区与热影响区的交界处,与显微硬度最小位置相吻合。当转速增大至525 r/min时,焊缝出现表面点状缺陷;当转速达到550 r/min时,焊缝出现连续的犁沟缺陷。

    Abstract:

    The 20 mm thick 2219 C10S aluminum alloy sheets were subjected to friction stir welding. The internal defects, macroscopic morphology, microstructure, micro-hardness and tensile mechanical properties of the welding joints at the speed of 400~550 r/min were compared under the condition of a travelling speed of 100 mm/min. The results show that when the rotation speed is 400~500 r/min, the welded joints with no defects and higher internal quality can be obtained. As the speed increases, the distance between the "onion rings" in the weld nugget zone and the range of the shoulder affect zone increase, and the micro-hardness of the weld nugget zone and the thermo-mechanical affect zone decreases more obviously. The tensile mechanical property of the joints decreases with the increase of the rotation speed. The maximum tensile strength can reach 334 MPa. The fracture mode of the joint is mainly ductile fracture occurring at the junction of the thermos-mechanical affect zone and the heat affect zone on the retreating side. It coincides with the position of the minimum micro-hardness. Point defects were observed on the surface of the weld joint when the rotation speed increased to 525 r/min and continuous furrow defects were observed inside the weld joint when the rotation speed increased to 550 r/min.

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计鹏飞,张仲宝,赵光辉,王杰,乔森.转速对20 mm厚2219铝合金搅拌摩擦焊接件的组织及性能的影响[J].宇航材料工艺,2022,52(3):56-61.

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历史
  • 收稿日期:2020-10-08
  • 最后修改日期:2021-02-02
  • 录用日期:2021-02-03
  • 在线发布日期: 2022-07-05
  • 出版日期:
第十一届航天复合材料成形与加工工艺技术中心交流会 征文通知

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