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Double-sided friction stir welding of Nitronic-40 stainless steel for application in tokamak devices

journal of Materials Science & Technology 2023年第28期159卷 170-183页

作者： Supreeth Gaddam Ravi Sankar Haridas Deepthi Tammana Charlie Sanabria christopher j.lammi Diana Berman Rajiv S.Mishra Center for Friction Stir Processing Department of Materials Science and EngineeringUniversity of North TexasDentonTX76207USA Advanced Materials and Manufacturing Processes Institute University of North TexasDentonTX76207USA Department of Mechanical Engineering University of North TexasDentonTX76207USA Commonwealth Fusion Systems CambridgeMAUSA

Nitrogen containing austenitic stainless steels(N-ASS)are widely utilized to fabricate various structural components in tokamak type fusion reactors owing to their suitable mechanical and functional *** components are exposed to a range of temperatures(4-500 K)and interact closely with the magnetic fields that are used to control and contain the plasma within the tokamak ***-40(N40)or XM-11 stainless steel is one such N-ASS used for fabricating structural components in the mag-netic and vacuum vessel systems in tokamak *** of most of the larger components in the magnetic and vacuum vessel systems typically involves some type of fusion-based welding *** study presents a double-sided friction stir welding(FSW)approach as an alternative to fusion welding processes to join 12 mm thick N40 plates to obtain joints with a low fraction ofδferrite(a detrimen-tal ferromagnetic phase),high joint efficiency,no sensitization and loss of hardness in the heat affected zone,and minimal nitrogen desorption from the weld *** double-sided FSW approach yielded superior weldments when compared to similar joints accomplished by fusion welding for application in tokamak devices.

关键词： Friction stir welding Nitronic-40 stainless steel XM-11 stainless steel Magnetic and vacuum vessel systems Tokamak devices

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