层间等待时间对4043铝合金电弧增材制造成形质量的研究

Effect of Interlayer Waiting Time on Forming Quality of 4043 Aluminum Alloy Arc Additive Manufacturing

预设8 mm焊道宽度,采用不同层间等待时间进行4043铝合金的单道多层电弧增材制造试验,借助金相显微镜、万能试验机研究了层间等待时间对电弧增材件的外观形貌、显微组织和力学性能的影响。结果表明,层间等待时间是焊道增材高度、焊道侧表面粗糙度和厚度均匀性的关键因素。当层间等待时间为20~30 s时,外观成形质量良好,拉伸性能最优。随着层间等待时间的增加,晶粒逐渐细化。层间等待时间为0~30 s时,硬度呈中部低,底部、顶部高的分布;当层间等待时间为40 s时,硬度从底部到顶部呈下降趋势。

The single-pass multi-layer arc additive manufacturing tests of 4043 aluminum alloy were conducted under preset weld pass width of 8mm and different interlayer waiting times. The effects of interlayer waiting time on the appearance,microstructure and mechanical properties of the arc additive parts were investigated with the help of metallurgical microscope and universal testing machine. The results show that the interlayer waiting time is a key factor for the height of weld channel,the side surface roughness of weld channel and thickness uniformity. When the interlayer waiting time is 20-30s, the appearance forming quality is good and the tensile properties are optimal. With the increase of interlayer waiting time, the grain gradually refines. When the interlayer waiting time is 0-30 s, the hardness shows a distribution of low in the middle and high at the bottom and top. When the interlayer waiting time is 40 s, the hardness shows a decreasing trend from the bottom to the top.