激光功率对5356铝合金激光诱导MIG电弧增材制造组织性能的影响
Effect of laser power on microstructure and properties of 5356 aluminum alloy by laser induced MIG arc additive manufacturing
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摘要: 为了改善MIG电弧增材制造5356铝合金的组织及力学性能，将低功率激光与MIG电弧增材制造结合，采用低功率脉冲激光诱导MIG电弧增材制造技术进行了不同激光功率下5356铝合金单道多层墙体成形试验，分析了激光功率对沉积态5356铝合金组织、显微硬度及拉伸性能的影响.结果表明，低功率脉冲激光诱导MIG电弧增材制造成形试样整体冶金结合良好、无明显的未熔合现象.墙体的微观组织主要呈等轴晶状，与单MIG电弧堆积的墙体相比，等轴晶变得细小均匀，显微硬度提高，波动较小.加入激光可以减少Fe元素、Si元素含量和气孔数量，使墙体的力学性能提高，当激光功率为300 W时达到最大值，较单MIG电弧堆积墙体的抗拉强度提高了12.0%.Abstract: In order to improve the microstructure and mechanical properties of 5356-Al alloy produced by additive manufacturing with MIG welding, The article combine the low power pulse laser with MIG arc welding. In this paper, 5356-Al alloy wall-shaped parts were molded by pulse laser -MIG arc hybrid heat source with different laser powers, and the influence of laser power on the microstructure, microhardness and tensile properties of the deposited 5356 aluminum alloy were studied. The results show that wall-shaped parts produced by laser induced MIG arc additive manufacturing have a good metallurgical junction and fusion phenomenon. The microstructure of the wall is mainly equiaxed grains. Compared with MIG arc additive manufacturing, the equiaxed grains of the wall fabricated by laser induced MIG arc additive manufacturing become smaller and more homogeneous, which makes the micro hardness of the wall increased and the fluctuation smaller. The addition of laser can reduce the content of Fe element, Si element and hydrogen porosity, and improve the mechanical properties of the wall. When the laser power is 300 W, the tensile strength achieves the maximum value, which increases by 12% than the non-laser one.
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