低频机械振动对电弧增材制造低碳钢组织和力学性能的影响

Effect of Low Frequency Mechanical Vibration on Microstructure and Mechanical Properties of Mild Steel Produced by Wire Arc Additive Manufacturing

电弧增材制造由于其沉积效率高、生产成本低,在制造大尺寸金属零件方面受到广泛的关注。探究了低频机械振动对电弧增材制造制备的低碳钢薄壁零件微观组织和力学性能的影响。研究发现,在0~20 Hz频率和0~0.7 mm振幅范围内的机械振动可以细化电弧增材制造低碳钢晶粒尺寸,提升其拉伸强度。随着频率从0增加到20 Hz,平均晶粒尺寸由7.60μm降至6.67μm,降低了12%,抗拉强度和屈服强度分别提升至497.5 MPa和385 MPa;随着振幅从0增加到0.7 mm,平均晶粒尺寸由7.60μm降至6.35μm,降低了16%,抗拉强度和屈服强度分别提升至500 MPa和385 MPa。利用低成本的机械振动辅助电弧增材制造可以优化低碳钢的组织和性能,这为高性能增材制造提供了参考。

Due to its high deposition efficiency and low production cost,wire arc additive manufacturing(WAAM)has received extensive attention in the fabrication of large-scale metal parts.The effects of low-frequency mechanical vibration on the microstructure and mechanical properties of low-carbon steel thin-walled parts fabricated by WAAM were studied.The results showed that the mechanical vibration in the frequency range of 0-20 Hz and amplitude of 0-0.7 mm refined the grain size and improved the tensile strength of the lowcarbon steel fabricated by WAAM.As the frequency increased from 0 to 20 Hz,the average grain size decreased from 7.60μm to 6.67μm,which decreased by 12%,and its tensile strength and yield strength increased to 497.5 MPa and 385 MPa,respectively;as the amplitude increased from 0 to 0.7 mm,the average grain size decreased from 7.60μm to 6.35μm,which decreased by 16%,and its tensile strength and yield strength increased to 500 MPa and 385 MPa,respectively.Using low-cost mechanical vibration-assisted WAAM can optimize the microstructure and properties of the low-carbon steel,which provides a reference for high-performance additive manufacturing.