摘要
采用水下搅拌摩擦焊接技术(SFSW)对2024-T4铝合金板材进行连接,研究了转速对SFSW接头焊核区析出相形貌和显微硬度的影响。结果表明:循环水冷具有明显的瞬时快冷作用,SFSW接头焊核区S-Al2CuMg相在热循环作用下发生析出长大。随着转速的提高,析出相的数量逐渐增多,且尺寸增大。S相粗化是导致焊核区显微硬度随转速增大而降低的主要原因。
2024-T4 aluminum alloy plate was jointed by submerged friction stir welding （SFSW）, and the effect of rotation speed on the precipitate morphology and microhardness of the nugget zone in SFSW weld was investigated. The results show that cooling water circulation has significant instantaneous cooling effect. S-A12CuMg phases of the nugget zone precipitate and grow under welding thermal cycle. The quantity and size of the precipitates gradually increase with the increase of the rotation speed. S phase coarsening is the main reason for the microhardness decrease with the increase of rotation speed in the nugget zone.
出处
《热加工工艺》
CSCD
北大核心
2012年第7期109-111,共3页
Hot Working Technology
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
水下搅拌摩擦焊接
铝合金
析出相
显微硬度
submerged friction stir welding
aluminum alloy
precipitates
microhardness
