工艺参数对Fe-Co-Ni-Cu粉芯丝材电弧增材制造熔敷层组织和性能的影响

Effect of Process Parameters on Microstructure and Properties of Arc Additive Deposited Layer with Fe-Co-Ni-Cu Cored Wire

研究不同工艺参数对Fe-Co-Ni-Cu粉芯丝材电弧增材制造熔敷层微观组织及硬度的影响,并且寻找出最佳的电弧熔敷工艺参数,获得冶金结合好、性能良好的熔敷层。综合分析可得,最优电弧熔敷工艺参数为熔敷电流210A、焊接速度160 mm/min、送丝速度140 cm/min,得到的熔敷层形貌平整、光滑,稀释率为16.62%,熔敷层平均显微硬度为329.1 HV,抗拉强度为473.8 MPa,耐磨性较基材提高了近1倍。从结合区至熔敷层表层的典型组织依次为平面晶、胞状晶、胞状树枝晶。随着熔敷电流的增大,组织变得粗大;近随着送丝速度、焊接速度的增大,组织变得细小。

The influence of different process parameters on the microstructure and hardness of the deposited layer by Fe-Co-Ni-Cu powder core wire arc additive manufacturing was studied. The best arc cladding process parameters were obtained to get the cladding layer with good metallurgical bonding and good performance. Through the comprehensive analysis, the optimal arc deposition process parameters are deposition current of 210 A, wire feeding speed of 140 cm/min,welding speed of 160 mm/min. The morphology of the deposited layer is flat and smooth, the dilution rate is almost, 16.62%.The average microhardness of the deposited layer is 329.1 HV, the tensile strength is 473.8 MPa, the wear resistance is 1 time higher than that of the base material. The typical microstructure from the bonding zone to the surface layer of the deposited layer is sequentially plane crystal, cellular crystal and cellular dendrite. With the increase of the welding current, the structure becomes coarse;with the increase of wire feeding speed and welding speed, the structure gradually becomes fine.