+高级检索
2219-T6静轴肩辅助搅拌摩擦焊组织与性能分析
DOI:
作者:
作者单位:

作者简介:

通讯作者:

基金项目:


Analysis of Microstructure and Mechanical Properties of 2219-T6 Non-rotational Shoulder Assisted Friction Stir Welding
Author:
Affiliation:

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
    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.

    Abstract:

    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.

    参考文献
    相似文献
    引证文献
文章指标
  • PDF下载次数:
  • HTML阅读次数:
  • 摘要点击次数:
  • 引用次数:
引用本文

贺地求,刘朋,王海军,王东曜,赖瑞林.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,2021,48(8):11~18

复制
历史
  • 收稿日期:
  • 最后修改日期:
  • 录用日期:
  • 在线发布日期: 2021-09-06
  • 出版日期:
作者稿件一经被我刊录用,如无特别声明,即视作同意授予我刊论文整体的全部复制传播的权利,包括但不限于复制权、发行权、信息网络传播权、广播权、表演权、翻译权、汇编权、改编权等著作使用权转让给我刊,我刊有权根据工作需要,允许合作的数据库、新媒体平台及其他数字平台进行数字传播和国际传播等。特此声明。
关闭