等轴晶
材料科学
微观结构
合金
极限抗拉强度
复合材料
电子背散射衍射
粒度
超声波传感器
延伸率
冶金
物理
声学
作者
Chunhuan Guo,Dongsheng Guo,Tao Dong,Fengchun Jiang,Ruonan Qin,Mengxin Cao,Dongliang Cui
标识
DOI:10.1002/adem.202301498
摘要
Additive manufacturing (AM) usually leads to the epitaxial growth of columnar grains in the deposition layer along the construction direction, typically resulting in the decrease in mechanical properties. In this study, A517Q alloy steel was fabricated by laser and wire additive manufacturing (LWAM) assisted with ultrasonic vibration (UV) treatment. The microstructure characteristics of A517Q alloy steel under different UV affected were investigated by OM, XRD, SEM, and EBSD. Compared with the sample without UV, the percentage of equiaxed grains in samples with dual UV increased by 90%. Due to the optimization of grain structure, the tensile strength of the sample with dual UV increased by 29% and the elongation had also been improved. The results showed that due to the cavitation and acoustic flow effects of ultrasonic, the temperature gradient ( G ) of the molten pool reduced and the solidification rate ( R ) increased, thus promoting the transformation from columnar grains to equiaxed grains.
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