CO2激光焊接快速凝固耐热铝合金AA8009
来源期刊：中南大学学报(自然科学版)2006年第2期
论文作者：丁荣辉 黎文献 王日初 肖于德 马正清 余琨 路彦军
文章页码：217 - 222
关键词：快速凝固;耐热铝合金AA8009; CO2激光焊接
Key words：rapid solidified; heat-resistant aluminum alloy AA8009; CO2 laser welding
摘 要：采用3种不同的焊接速度(0.6, 1.5和2.4 m/min),对板厚为1 mm的耐热铝合金AA8009进行CO2激光焊接。研究结果表明:在焊接冷却速度为102~103℃/s时,焊缝中心凝固组织为亚共晶组织,大量细小的第二相粒子弥散分布在细小近等轴的α-Al中;在熔化区边界存在大量粗大的针状相分布在粗大胞状枝晶α-Al中;提高焊接速度可改善焊接接头组织和性能,当焊接速度为2.4 m/min时,焊缝组织类似于基材组织;焊接接头断裂发生在熔化区边界。
Abstract: Three kinds of welding speed(0.6, 1.5 and 2.4 m/min) were used to joint the heatresistant aluminum alloy AA8009 plate with 1 mm in thickness by CO2 laser welding. The results show that when the cooling rate of the heat-resistant aluminum alloy by CO2 laser welding is 102~103℃/s, at the center of the fusion zone, the structure exhibits hypoeutectic morphology, and alarge number of fine second phases precipitate in the fine equiaxedα-Al matrix; near the fusion boundary there is a lot of coarse needle-like phases existing in the coarse cellularα-Al matrix.The higher the welding speed is, the better the welding structure and performance are. When the welding speed is 2.4 m/min, the microstructure of center region is similar to that of base metal;the fractures of the welded joints occur in the fusion boundary region.
