首页|Mechanical and microstructural characterizations of friction stir welded dissimilar butt joints of Inconel 718 and AISI 204Cu austenitic stainless steel
Mechanical and microstructural characterizations of friction stir welded dissimilar butt joints of Inconel 718 and AISI 204Cu austenitic stainless steel
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NSTL
Elsevier
? 2022This study explored the feasibility of friction stir welding (FSW) of dissimilar butt joints of 3 mm thick Inconel 718 Ni-based superalloy and AISI 204Cu stainless steel. The effect of operating parameters on microstructure and mechanical properties of the weldments were investigated with varying traverse speeds of 40, 70, 90 and 140 mm/min while keeping the rotational speed constant, i.e. 300 rpm. The microstructural characterization was performed using optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results revealed that the formation of M23C6 carbide particles and fine equiaxed recrystallized austenite and ferrite grains in the nugget zone led to an increase in mechanical properties. The atomic diffusion region at the joint interface of the Inconel 718 and AISI 204Cu was an average thickness of 1.5 μm showed an fcc microstructure with refined MC carbide particles (average size 40 nm) and NbC carbides (average size 50 nm). In addition, a dragged material from Inconel 718 on the advancing side of the stainless steel 204Cu was found, which was directly affected by the traverse speed and related to the strength of the joint. Grain refinement in the nugget zone caused by dynamic recrystallization was observed at all conditions, improving mechanical properties. Based on the obtained results, the medium traversed speeds, i.e. 70 and 90 mm/min at a rotational speed of 300 rpm, were recommended for the sound weld.
NSTL
Elsevier
