چکیده مقاله
In this study, the effect of heat treatment on the microstructure of the 2209 duplex stainlesssteel wall fabricated by the Wire arc additive manufacturing WAAM process was investigated Forthis purpose, the Gas metal arc welding GMAW process was employed to fabricate the wall on a2205 duplex stainless steel base metal The wall was divided into four sections to examine themicrostructural variations The results revealed that grains near the base metal were equiaxed,transitioning to a columnar structure as the distance from the base metal increased In the final layer,the grains became equiaxed again, with a smaller grain size In all regions, austenite was observed inmorphologies such as intragranular austenite, Widmanstätten austenite, and grain boundary austenite The austenite phase fraction was analyzed across various regions of the wall Microstructuralobservations indicated that the optimal microstructure of the base metal, with approximately 50%ferrite and 50% austenite, was entirely disrupted Additionally, a significant amount of secondaryaustenite was formed due to the welding thermal cycles Moreover, the austenite phase fractiondecreased with increasing distance from the base metal and near the topmost layer To improve the wall's microstructure, heat treatment was performed at 1050°C, followed by waterquenching The results demonstrated that at 1050°C, the desired ferrite austenite phase ratio wasachieved After solution heat treatment, the detrimental phases dissolved into the ferritic phase, andthe distribution of austenite became more uniform Compared to the pre heat treatment state, thestructure became finer grained, more equiaxed, and exhibited greater uniformity and alignment
کلیدواژهها
نویسندگان
Fatemeh Noubahar
MSc student, Faculty of Materials Engineering, Sahand University of Technology
Tohid Saeid
PhD, Faculty of Materials Engineering, Sahand University of Technology
Reza Tavangar
PhD, Faculty of Materials Engineering, Sahand University of Technology
شیوه ارجاع
Noubahar, Fatemeh and Saeid, Tohid and Tavangar, Reza,1403,Effect of heat treatment after wire-arc additive manufacturing on themicrostructure of duplex stainless steel,7th International Conference on Welding and Non Destructive Testing & 25th National Conference on Welding & Inspection & 14th National Conference on NDT & 3nd National Conference on Additive Manufacturing,Tehran
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