摘要
The purpose of this study is to reveal the microstructure and mechanical properties of friction stir welding(FSW)joints prepared in water/air.For comparable analysis,the submerged FSW(SFSW)and conventional FSW are both conducted on 6061-T6 aluminum alloy plates at the combination rotation speed of 800 r/min and the traverse rate of 50 mm/min.The results show that a greatest grain refinement is achieved by SFSW,which is remarkably smaller than that of the base material(BM)and air FSW(AFSW)samples,leading to a significant improvement of tensile strength from 202.5 MPa in the AFSW sample to 232 MPa in the SFSW sample.
本研究的目的是揭示水下/空气中制备的搅拌摩擦焊(Friction stir welding,FSW)接头的组织和力学性能。采用相同工艺参数(800 r/min,50 mm/min)对6061-T6铝合金板分别进行了水下和空气搅拌摩擦焊接,结果表明,相比传统的空气搅拌摩擦焊接工艺,水下搅拌摩擦焊工艺体现出强烈的细晶强化作用,大幅细化了焊后组织,且明显提高了焊后接头的抗拉强度。焊后接头的抗拉强度由空气搅拌摩擦焊接头的202.5 MPa提高到水下搅拌摩擦焊接头的232 MPa。
