Microstructure,mechanical properties and corrosion resistance of the Ni-based alloy NS1402 TIG welded joints
The weldability of domestic nickel-based alloy NS1402 by TIG welding with nickel-based wire ERNiFeCr-1 as the filler material was studied.The microstructures and mechanical properties of the joints were analyzed compared with the foreign Incoloy825 alloy.At the same time,the effect of common low alloy steel wire ER50-6 on the weldability of the two alloys at home and abroad was com-pared,and the corrosion resistance of the joints was investigated.The results show that the nickel-based alloy NS1402 joints are well formed,and the weld zone consists of a large area of equiaxial crystals and a small number of columnar crystals.Tensile specimens are broken at the NS1402 welding seam,and the welded joints have a tensile strength of 570 MPa,which is 89.1%of the tensile strength of base met-al.The strength and elongation of NS1402 are slightly lower than that of the imported 825 alloy.The fracture morphology of the joints after tensile testing is observed and analyzed.It is found that the frac-ture morphology of nickel-based alloy NS1402 welded joint exhibits ductile fracture,with a higher number of small-sized dimples on the fracture joints.The corrosion resistance of nickel-based wire ERNiFeCr-1 joint is better than the common ER50-6 wire joints.The corrosion test results show that the corrosion resistance of the domestic nickel-based alloy NS1402 joints and foreign Incoloy825 joints is comparable.
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