贺地求1,2,刘朋1,王海军2,王东曜2,赖瑞林3.2219-T6静轴肩辅助搅拌摩擦焊组织与性能分析[J].湖南大学学报:自然科学版,2021,(8):11~18
2219-T6静轴肩辅助搅拌摩擦焊组织与性能分析
Analysis of Microstructure and Mechanical Properties of 2219-T6 Non-rotational Shoulder Assisted Friction Stir Welding
  
DOI:
中文关键词:  搅拌摩擦焊  2219-T6铝合金  微观组织  力学性能
英文关键词:friction stir welding  2219-T6 aluminum alloy  microstructure  mechanical properties
基金项目:
作者单位
贺地求1,2,刘朋1,王海军2,王东曜2,赖瑞林3 (1. 中南大学 轻合金研究院湖南 长沙 410083 2. 中南大学 高性能复杂制造国家重点实验室湖南 长沙 410083 3. 中南大学 粉末冶金国家重点实验室湖南 长沙 410083) 
摘要点击次数: 52
全文下载次数: 39
中文摘要:
      为探究安装外部静止轴肩对搅拌摩擦焊接头成形和力学性能的影响,采用自主研制的外部静止轴肩辅助搅拌摩擦焊(Non-Rotational Shoulder Assisted Friction Stir Welding,NRSA-FSW)焊具对2219-T6铝合金4 mm厚板材进行对接焊试验,观察焊后接头表面成形情况. 采用拉伸和显微硬度试验对焊缝的力学性能进行测试,并与相同焊接参数下的搅拌摩擦焊(Friction Stir Welding,FSW)进行对比分析. 使用金相显微镜和场发射扫描电镜对接头焊缝组织进行分析. 结果表明,由于静止轴肩的平动刮擦作用,NRSA-FSW相比FSW,接头表面更加光滑,无鱼鳞纹、飞边以及接头减薄现象. NRSA-FSW接头相比于FSW接头软化区有所增加,接头显微硬度分布更加均匀. NRSA-FSW接头平均抗拉强度323 MPa,达到母材的72%,抗拉强度同FSW相近 . NRSA-FSW焊核呈“U”状,焊缝组织无缺陷. 接头拉伸试验在焊核区(Nuggest-Zone,NZ)处断裂,为韧性断裂.
英文摘要:
      To investigate the effect of the external stationary shoulder on the formability and mechanical properties of friction stir welding joint,the self-developed NRSA-FSW ( non-rotational shoulder assisted friction stir welding ) was used to weld 2219-T6 aluminum alloy with the thickness of 4 mm plate. Mechanical properties of the joint were analyzed by tensile test and microhardness test. Optical microscopy and field emission scanning electron microscope were used to analyze the microstructure of the joint cross section. The results showed that the surface of the joint processed by NRSA-FSW formed without fish scales,flash,and thinning,and represented smooth appearance due to the scrapping effect of the static shoulder. Compared with the joint processed by FSW (friction stir welding) under the same condition,the softening zone of the joint processed by NRAS-FSW increased,and the microhardness distribution of the joint was more uniform. The average ultimate tensile strength of joints processed by NRAS-FSW was 323 MPa,approaching 72% of the base material,which was similar to the joint processed by FSW. Defects were not observed in the joint processed by NRSA-FSW. NZ (nuggest-zone) appeared as a "U" shape and the joint fractured in the NZ during tensile tests,which was ductile fracture.
查看全文  查看/发表评论  下载PDF阅读器
关闭