Effect of Arc Trajectory on Microstructure and Properties of Inconel 625 AlloyThick-Wall Parts by CMT Arc Additive Manufacturing
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摘要: 采用以冷金属过渡（CMT）电弧为热源的增材制造技术制备Inconel 625合金厚壁件，对比研究了摆动与两道多层电弧轨迹下厚壁件的显微组织和性能。结果表明：在摆动电弧轨迹增材制造过程中出现了飞溅现象，厚壁件表面粗糙，而在两道多层电弧轨迹增材制造过程中无明显飞溅现象，厚壁件表面光滑平整；厚壁件中树枝晶的生长方式均为外延生长，树枝晶中存在二次枝晶以及三次枝晶，且两道多层电弧轨迹下的枝晶间距小于摆动电弧轨迹下的；两道多层电弧轨迹下厚壁件的平均抗拉强度高于摆动电弧轨迹下的；摆动和两道多层电弧轨迹下厚壁件的抗拉强度各向异性百分比均很小，分别为4%，4.5%，厚壁件的断裂类型均为韧性断裂。
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关键词:
- Inconel 625合金 /
- 冷金属过渡电弧增材制造 /
- 显微组织 /
- 拉伸性能
Abstract: The thick-wall parts of Inconel 625 alloy were prepared by additive manufacturing technique using cold metal transition (CMT) arc as heat source. The microstructure and properties of the parts under oscillating and two-pass multi-layer arc trajectories were comparatively studied. The results show that spatter appeared during the additive manufacturing with oscillating arc trajectory, and the surface of the thick-wall parts was rough; no obvious spatter appeared during additive manufacturing with two-pass multi-layer arc trajectory, and the surface was smooth. The growth mode of dendritic crystals in the thick-wall parts was epitaxial growth, and there were secondary and tertiary dendrites in the dendritic crystals; the dendrite spacing under oscillating arc trajectory was smaller than that under two-pass multi-layer arc trajectory. The average tensile strength of the thick-wall parts under two-pass multi-layer arc trajectory was higher than that under oscillating arc trajectory. The anisotropy percentages of the tensile strength of thick-wall parts under oscillating and two-pass multi-layer arc trajectory were very small, which were 4% and 4.5%,respectively. The fracture type of thick-wall parts was ductile fracture. -
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