Microstructure and Properties of 2195-T8 Al-Li Alloy Laser Welded Joint
摘 要
采用高功率CO2激光焊机焊接3.7 mm厚的2195-T8铝锂合金,研究了不同焊接工艺参数对焊缝成形质量的影响,并对优化焊接工艺条件下焊态和固溶时效态焊接接头的显微组织及力学性能进行了比较。结果表明:焊态接头焊缝区的硬度为81.81 HV,比母材的下降了32.3%,接头的抗拉强度为296 MPa,比母材的下降了49%;经固溶时效处理后,焊缝的组织更加均匀,晶界及晶内析出了许多弥散且均匀分布的T1(Al2CuLi)强化相,焊缝硬度和接头的抗拉强度比热处理前的分别提高了25.6%和13.7%。
Abstract
2195-T8 Al-Li alloy with thickness of 3.7 mm was welded by using high power CO2 laser welding machine. The effect of welding process parameters on quality of welding joint was investigated, and the microstructure and mechanical properties between as-welded and post-weld solution-aging joints under the optimal welding parameters were compared. The results show that the microhardness of as-welded joint weld seam was 81.81 HV, which had decreased by 32.3% than that of the base metal and the average tensile strength of as-welded joint weld seam was 296 MPa, which had decreased by 49% than that of the base metal. After solution-aging treatment, the microstructure of the weld seam became more homogeneous, and lots of strengthening phases T1(Al2CuLi) evenly reprecipitated in the grain boundaries and inside the grains. Meanwhile, the microhardness and the tensile strength had increased by 25.6% and 13.7% than that of weld seam without solution-aging treatment, respectively.
中图分类号 TG456.7 DOI 10.11973/jxgccl201705019
所属栏目 材料性能及应用
基金项目 国家自然科学基金资助项目(51171116)
收稿日期 2015/12/8
修改稿日期 2017/3/15
网络出版日期
作者单位点击查看
备注倪彪(1991-),男,安徽六安人,硕士研究生.
引用该论文: NI Biao,MENG Wei,LI Zhuguo. Microstructure and Properties of 2195-T8 Al-Li Alloy Laser Welded Joint[J]. Materials for mechancial engineering, 2017, 41(5): 95~99
倪彪,孟威,李铸国. 2195-T8铝锂合金激光焊接接头的组织与性能[J]. 机械工程材料, 2017, 41(5): 95~99
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参考文献
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【7】张玉岐,杨春利,林三宝,等. 2195铝锂合金超声TIG焊的组织与性能分析[J].焊接学报, 2015, 36(10):53-56.
【8】宋骁,邢丽,黄春平,等. 搅拌摩擦焊工艺参数对2198铝锂合金焊缝成形及接头力学性能的影响[J]. 机械工程材料,2012,36(7):28-31.
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