Śnieżek Lucjan, Kosturek Robert, Wachowski Marcin, Kania Bogusz
Faculty of Mechanical Engineering, Military University of Technology, 2 gen. S. Kaliskiego St., 00-908 Warsaw, Poland.
Institute of Metallurgy and Materials Science of Polish Academy of Sciences, 25 Reymonta St., 30-059 Kraków, Poland.
Materials (Basel). 2020 Feb 12;13(4):834. doi: 10.3390/ma13040834.
The aim of this research was to investigate the effect of different heat treatment conditions of AA2519 friction stir welded joints on their microstructure and residual stresses. The following welding parameters have been used: 500 rpm tool rotation speed, 150 mm/min tool traverse speed, tool tilt angle 2°, pressure force 17 kN. The welded material was investigated in three different configurations: HT0, HT1, and HT2. The first type of weld (HT-0) was made using AA2519 alloy in non-precipitation hardened state and examined in such condition. The second type of weld (HT-1) has been performed on AA2519-T62, that corresponds to precipitation hardening condition. The last type of weld (HT2) was performed on annealed AA2519 and the obtained welds were subjected to the post-weld precipitation hardening process. The heat treatment was carried out in two stages: solution heat treatment (530°C/2h + cooling in cold water) and aging (165C/10h). Residual stresses were measured using X-Ray diffraction patterns obtained from Bruker D8 Discover X-Ray diffractometer utilizing the concepts of Euler cradle and polycapillary primary beam optics. The conducted research indicates that the best material properties: homogenous microstructure and uniform distribution of microhardness and compressive state of residual stresses were obtained for the HT-2 series samples subjected to heat treatment after the friction stir welding (FSW) process.
本研究的目的是调查AA2519搅拌摩擦焊接头的不同热处理条件对其微观结构和残余应力的影响。采用了以下焊接参数：刀具转速500转/分钟、刀具横向速度150毫米/分钟、刀具倾斜角度2°、压力17千牛。对焊接材料进行了三种不同配置的研究：HT0、HT1和HT2。第一种焊缝（HT-0）采用非沉淀硬化状态的AA2519合金制成，并在该状态下进行检查。第二种焊缝（HT-1）在AA2519-T62上进行，该材料对应于沉淀硬化状态。最后一种焊缝（HT2）在退火后的AA2519上进行，所得焊缝进行焊后沉淀硬化处理。热处理分两个阶段进行：固溶热处理（530°C/2小时+在冷水中冷却）和时效处理（165°C/10小时）。利用欧拉摇篮和聚毛细管初级光束光学概念，通过布鲁克D8 Discover X射线衍射仪获得的X射线衍射图谱测量残余应力。进行的研究表明，对于搅拌摩擦焊（FSW）后经过热处理的HT-2系列样品，获得了最佳的材料性能：均匀的微观结构、均匀分布的显微硬度以及残余应力的压缩状态。
