摘要
分别在空气和循环水冷条件下对2024-T4铝合金板进行搅拌摩擦焊接,研究水冷介质对FSW接头焊核区组织性能的影响。结果表明,循环水冷具有明显的瞬时快冷作用,水冷介质下FSW可以显著细化晶粒,焊核区的平均晶粒尺寸达到700 nm。沉淀强化对焊核区显微硬度起到主要作用,细晶强化作用较弱。水冷介质减弱了FSW接头的热软化效应,细化晶粒,抑制析出相的聚集长大,从而改善接头的组织性能。
2024-T4 aluminum alloy plates were jointed by friction stir welding （FSW） under the condition of air and cooling water circulation, respectively, and the effect of cooling water on the microstructure and mechanical properties of the nugget zone was investigated. The results show that cooling water circulation has significant instantaneous cooling effect. Cooling water causes significant grain refinement, with an average grain size of 700 nm in nugget zone. Precipitation strengthening is the main strengthening mechanism, while grain refinement strengthening is relatively weak. Cooling water decreases thermal softening effect of friction stir welded joint, refines grain size and inhibits the growth of precipitates, thus improving the microstructure and properties of joint.
出处
《兵器材料科学与工程》
CSCD
北大核心
2012年第2期1-3,共3页
Ordnance Material Science and Engineering
基金
国家自然科学基金资助项目(51074119)
陕西省教育厅科学研究计划资助项目(11JK0802)
关键词
铝合金
搅拌摩擦焊接
冷却介质
微观组织
显微硬度
aluminum alloy
friction stir welding
cooling medium
microstructure
microhardness
