<p>Additive Manufacturing (AM) processes are essentially an extension of welding in terms of adding layers of molten metal to the work and same metallurgical principles such as full melting and solidification kinetics, thermo-dynamic due to rapid heating and cooling cycles, phase transformation, post heat treatment, final part properties determined by all metallurgical principles involved. The whole metal AM part is consequently one large weld. The welding processes have been widely applied in pressure vessel manufacturing industries. GMAW (Gas Metal Arc Welding) based Wire Arc Directed Energy Deposition (WA DED) process is one of the key metal AM processes. WA DED AM process has advantages of high build rates, production of relatively large parts, reduced material wastes, no need for support structures to build-up, and creation of hybrid structures and composition gradients by application of varieties of commercially available wire alloys. Thus, WA DED process with commercial UNS S31603 filler wires, ER316L and ER316LSi, were applied to investigate whether print deposits satisfy the requirements for manufacturing ASME safety class 1 nuclear pressure valve components. Comprehensive chemical, micro-structural, and mechanical test data on ER316L and ER316LSi print deposits were investigated. Mechanical tests include hardness, bend, CVN, room and high temperature tensile up to 525℃. The test results were compared with ASME SA-182 forging and ASME SA-351 casting valve specifications, and ASTM F3184 standard for AM UNS S31603 with powder bed fusion. From this study, it was concluded that the as-print and solution annealed deposits which were printed with ER316LSi filler wire were recommended for manufacturing ASME safety class 1 nuclear pressure valve components.</p><p>Keywords: Additive Manufacturing; Wire Arc Directed Energy Deposition; Additive Manufacturing Procedure Specification; Post Print Heat Treatment</p>

Directed Energy Deposition of UNS S31603 Materials by Wire Arc Energy for Nuclear Application

Paper Proceedings: https://asmedigitalcollection.asme.org/PVP/PVP2021/volume/85314

ASME 2021 Pressure Vessels & Piping Conference (PVP2021)

Supporting the need among researchers worldwide for additional online and multimedia content, ASME now offers the ASME Conference Video Collection. This platform will collect and provide long-term access to conference presentation videos, encompassing all technology areas within ASME's technical conference and events program. About 30,000-40,000 engineers across all mechanical engineering and related disciplines participate in ASME conferences each year. This includes authors of approximately 6,000 to 8,000 technical papers published by ASME, the majority of whom also submit video presentations for our virtual conferences. The video collection will be available as an add-on to existing product packages or as a separate subscription.