摘要
采用冷金属过渡(CMT)方法在6061铝合金板上进行TiB_(2)/6056丝材增材制造研究。以送丝速度、焊接速度为变量,对不同热输入下增材层的表面成形、微观组织进行了观察和分析。结果表明:增大热输入,有利于降低复合材料增材焊道的气孔率。当热输入在1.2~2.4 kJ/cm时,焊道成形良好,表面光滑,鱼鳞纹均匀。随着热输入的增大,焊道的熔宽和余高增加,增材层组织由树枝晶→胞状晶→等轴晶转变。增材焊道中细小的TiB_(2)颗粒大都呈聚集态分布在α-Al的晶间位置。
The cold metal transfer(CMT)technology was used to study TiB_(2)/6056 wire additive manufacturing process on 6061 aluminum sheet.Taking the wire feeding speed and welding speed as the variables,the surface formation and microstructure of the additive layers under different heat inputs were observed and analyzed.The results show that it is beneficial to reduce the porosity of the composite additive weld bead by increasing the heat input.When the heat input is 1.2-2.4 kJ/cm,the weld bead is well formed with smooth surface and uniform ripples.With the increase of heat input,the weld width and reinforcement increase,and the microstructure of the additive layer changes from dendrite,cellular to equiaxed crystal.The fine TiB_(2)particulates in the additive bead are mostly aggregated and distributed at the grain boundary ofα-Al.
作者
孙焕焕
冯杨
李险峰
巴豪强
李祉慕
SUN Huanhuan;FENG Yang;LI Xianfeng;BA Haoqiang;LI Zhimu(School of Materials Science and Engineering,Shenyang Ligong University,Shenyang 110159,China;The State Key Lab of Metal Matrix Composites,Shanghai Jiao Tong University,Shanghai 200240,China)
出处
《热加工工艺》
北大核心
2023年第21期44-48,54,共6页
Hot Working Technology
基金
沈阳理工大学大学生创新创业训练项目(202110144098)。
关键词
铝基复合材料
电弧增材制造
冷金属过渡(CMT)
组织
aluminum matrix composites
arc additive manufacturing
cold metal transfer(CMT)
microstructure
