搅拌摩擦增材制造2024-T6铝合金增材区性能分析

Performance analysis of 2024-T6 aluminum alloy additive zone in stirred friction additive manufacturing

用搅拌摩擦增材制造技术对2024-T6铝合金进行增材试验,观察增材区显微组织,结合显微硬度对增材区摩擦磨损性能进行分析,探索搅拌头行进速度对增材区性能的影响规律。结果表明:当搅拌头旋转速度为1000 r/min,行进速度为150~250 mm/min时,增材区成形良好,无明显缺陷;各参数下试样晶粒得到细化,增材区晶粒尺寸沿增材厚度方向逐渐减小,显微硬度沿增材厚度方向逐渐增大;随着搅拌头行进速度增大,试样显微硬度先增后减,同时摩擦磨损性能先变好后变差,当行进速度为200 mm/min时,显微硬度和摩擦磨损性能最佳。

The additive test of 2024-T6 aluminum alloy was carried out with friction stir additive manufacturing technology,and the microstructure of the additive zone was observed.The friction and wear properties of the additive zone were analyzed with the combination of microhardness,and the influence of the traveling speed of the mixing head on the properties of the additive zone was explored.The results show that when the rotating speed of the mixing head is 1000 r/min and the traveling speed is 150-250 mm/min,the forming of the additive area is good without obvious defects.The grain size in the additive zone decreases gradually along the direction of the additive thickness,and the microhardness increases gradually along the direction of the additive thickness.With the increase of the traveling speed of the mixing head,the microhardness of the sample increases first and then decreases,and the friction and wear properties of the sample become better first and then worse.When the traveling speed is 200 mm/min,the microhardness and friction and wear properties are the best.