为了给镍基Inconel 625合金大型复杂零件的高效高质成形提供简单可行的方法，采用基于冷金属过渡(CMT)的电弧熔丝增材方法制备了Inconel 625合金试样。研究了所制备的Inconel 625合金的微观组织、力学性能、耐腐蚀性能及其各向异性。结果表明，试样的主要物相为FCC结构γ Ni固溶体，析出相主要为Laves相与MC型碳化物，微观组织大部分是沿高度方向生长的树枝晶。硬度和抗拉强度存在各向异性，试样硬度为257～308 HV5 N，抗拉强度为690～750 MPa，屈服强度为460～550 MPa，延伸率为34%～40%。合金x向和z向的室温抗拉强度达到同级别锻件标准，断口形式均为典型的韧性断裂，断口韧窝中存在Laves相和少量碳化物的第二相颗粒。各向异性对腐蚀性能的影响不太明显，堆叠方向的试样耐腐蚀性略优于另外2个方向。
In order to provide a simple and feasible method for the efficient and high-quality forming of large and complex nickel-based Inconel 625 alloy parts,Inconel 625 alloy samples were prepared by CMT-based wire and arc additive manufacturing method.The microstructure,mechanical properties,corrosion resistance and anisotropy of the samples were investigated.Results showed that the main phase of the samples was γ Ni solid solution with FCC structure,the precipitation phases were mainly Laves phase and MC type carbide,and most of the microstructures were dendrites growing along the height direction.In addition,the hardness and tensile strength were anisotropic,and the samples possessed a hardness of 257～308 HV5 N,a tensile strength of 690～750 MPa,a yield strength of 460～550 MPa,and an elongation of 34%～40%.The tensile strength of the alloy in x and z directions at room temperature reached the standard of forged ones of the same grade,the fractures were all typical ductile fractures,and there were Laves phase and a small amount of second phase particles of carbides in the fracture dimples.Besides,the effect of anisotropy on corrosion performance was not obvious,and the corrosion resistance along stacking direction was slightly better than that along the other two directions.
