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,研究焊接速度对SFSW接头焊核区析出相形貌和显微硬度的影响。结果表明,循环水冷介质具有明显的瞬时快冷作用。SFSW接头焊核区S-Al2CuMg相在焊接热循环的作用下发生析出长大。随着焊接速度的增加,析出相的数量先增多后减少,尺寸先减小后增大。沉淀强化和细晶强化作用促使焊核区硬度随焊接速度的增加而增大。
2024-T4 aluminum alloy plate was jointed by submerged friction stir welding（SFSW）,and the effect of welding speed on the precipitate morphology and microhardness of the nugget zone in SFSW weld was investigated.The results show that cooling water circulation medium has significant instantaneous cooling effect.S-Al2CuMg phases in weld nugget zone precipitate and grow under welding thermal cycle.With the increase of welding speed,the quantity of precipitates firstly increases and then decreases,while the size of precipitates firstly decreases and then increases.Precipitation strengthening and grain refinement strengthening are the main reasons for the increase of microhardness of weld nugget zone.
出处
《兵器材料科学与工程》
CAS
CSCD
北大核心
2012年第3期12-15,共4页
Ordnance Material Science and Engineering
基金
国家自然科学基金资助项目(51074119)
教育部高等学校博士学科点专项科研基金(20096120110012)
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
焊接速度
析出相
显微硬度
submerged friction stir welding
aluminum alloy
welding speed
precipitate
microhardness
