304不锈钢冷金属过渡电弧增材制造组织及力学性能

Microstructure and mechanical properties of cold metal transfer arc additive manufactured 304 stainless steel

开展了不同填充速度的不锈钢冷金属过渡电弧增材制造试验,实施了构件不同位置的拉伸试验并且分析了断口形貌,探讨了构件微观组织特征。结果表明,冷金属过渡电弧增材制造是一种可行的金属增材制造工艺;由于构件在垂直方向的微观组织不均匀,水平拉伸的屈服强度和抗拉强度均高于垂直拉伸;随着送丝速度增加,扫描的热输入增加,熔化区的二次枝晶间距变大,抗拉强度降低。

Arc additive manufacturing of stainless steel based on cold metal transfer with different deposit rate was carried out.Tensile tests of different locations of the components were conducted and the fracture morphology was analyzed,and microstructure of the component was discussed.Results indicate that arc additive manufacturing based on cold metal transfer is a feasible metal additive manufacturing process.Yield strength and tensile strength of one component along horizontal direction are higher than that along the vertical direction due to the nonuniform microstructure of the components along the vertical direction.With higher deposit rate,the heat input increases,the secondary dendrite arm spacing in the fusion zone increases,and the tensile strength decreases.