高级检索
程龙, 杨新岐, 唐文珅, 罗庭, 王瑞林. 6061铝合金搅拌摩擦沉积增材修复工艺及修复区性能[J]. 焊接学报. DOI: 10.12073/j.hjxb.20230806001
引用本文: 程龙, 杨新岐, 唐文珅, 罗庭, 王瑞林. 6061铝合金搅拌摩擦沉积增材修复工艺及修复区性能[J]. 焊接学报. DOI: 10.12073/j.hjxb.20230806001
CHENG Long, YANG Xinqi, TANG Wenshen, LUO Ting, WANG Ruilin. Processes and repair area properties of AA6061 repaired via additive friction stir deposition[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION. DOI: 10.12073/j.hjxb.20230806001
Citation: CHENG Long, YANG Xinqi, TANG Wenshen, LUO Ting, WANG Ruilin. Processes and repair area properties of AA6061 repaired via additive friction stir deposition[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION. DOI: 10.12073/j.hjxb.20230806001

6061铝合金搅拌摩擦沉积增材修复工艺及修复区性能

Processes and repair area properties of AA6061 repaired via additive friction stir deposition

  • 摘要: 为了探讨修复工艺及模拟凹槽缺陷尺寸对搅拌摩擦沉积增材(additive friction stir deposition,AFSD)修复区组织及性能影响规律,对5 mm厚AA6061-T6板进行AFSD修复工艺试验. 结果表明,对于3 mm深度、6 ~ 24 mm不同宽度凹槽缺陷,采用主轴转速400 r/min、移动速度150 ~ 300 mm/min修复工艺均能实现沉积层与基板的有效冶金连接. 当凹槽宽度小于送料棒直径时,可以获得完全致密无缺陷的修复区;修复区附近可划分为修复沉积区、热力影响区、热影响区及母材. 沉积区完全由细小等轴晶组成,晶粒尺寸相当于基材晶粒尺寸的9.1% ~ 12.8%;在沉积区内主要强化相β"相几乎全部溶解,平均硬度为母材硬度的71.6%. 在400 r/min和300 mm/min工艺下,凹槽宽度12 mm修复态力学性能最佳,抗拉强度和断后伸长率分别为197.4 MPa和10.92%,试样均断裂于母材热影响区与热力影响区的交界处,具有韧性断裂模式. 当凹槽宽度为24 mm大于送料棒直径时,在400 r/min和150 mm/min工艺下力学性能最佳,修复态抗拉强度和断后伸长率分别为178.9 MPa和7.74%,此时产生于沉积层与基材结合界面的弱连接是影响修复性能关键因素.

     

    Abstract: The repair experiments of the additive friction stir deposition (AFSD) for the AA6061-T6 plates of 5 mm thickness were performed, and the influences of the repair processing parameters and groove defect sizes on the microstructures and properties of the repaired zone were explored. It is shown that adequate metallurgical bonding between the deposited layer and subtract can successfully be obtained for the groove defects with 3 mm depth and 6 ~ 24 mm widths under the rotational speed of 400 r/min and the traverse speeds of 150 ~ 300 mm/min. The fully dense and defect-free repair can be achieved when the groove width is smaller than the feed rod diameter, and the repair zone can be divided into the deposited zone (DZ), thermo-mechanically affected zone (TMAZ), heat-affected zone (HAZ), and base material (BM). The DZ is composed of refined equiaxed grains with grain sizes ranging from 9.1% to 12.8% of that of BM. The main β" strengthening phase in the DZ is almost completely dissolved, which results in the reduction of the average hardness of DZ corresponding to 71.6% of that of BM. For the AFSD parameters of 400 r/min, 300 mm/min, the tensile strength and elongation of the repaired sample with 12 mm groove width can reach the best mechanical property of 197.4 MPa and 10.92%, respectively. The fracture sites of samples are all located at the interfaces of HAZ and TMAZ and have the ductile fracture mode. The tensile strength and elongation of the repaired sample with the groove width of 24 mm which is greater than the feed rod diameter have the best mechanical property of 178.9 MPa and 7.74%, while for the 400 r/min, 150 mm/min AFSD parameters. In this case, the weak-binding defects formed at the interface between the deposited layer and BM are the key factor to influence the repair property. The experimental findings provide valuable insights for developing novel repair technology via AFSD in aluminum alloys.

     

/

返回文章
返回