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5146 |
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Tuesday, March 21, 2017, Hall Ford 3:45 PM Innovations I |
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Using scanning electron beam technology for the hard soldering of TWIP-matrix composites |
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Lars Halbauer* / Technische Universität Bergakademie Freiberg / Institut für Werkstofftechnik, Deutschland Paul-Ramon Proksch / Heat GmbH , Germany Anja Buchwalder/ Institute for Materials Engineering, TU Bergakademie Freiberg, Germany Rolf Zenker/ Institute for Materials Engineering, TU Bergakademie Freiberg, Germany Horst Biermann/ Institute for Materials Engineering, TU Bergakademie Freiberg, Germany |
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Composites consisting of metastable high-alloy TWIP steels and metastable zirconia particles exhibit outstanding specific energy absorption per unit weight. However, these composites are considered to be non-weldable due to the strong evaporation of zirconia during fusion welding. As an alternative approach, Electron Beam (EB) technology was used to create an energy transfer field capable of joining samples by means of hard soldering. For the experiments, a non-reinforced stainless steel and an Fe-Cr-Mn-Ni-based TWIP steel reinforced with zirconia particles were brazed as butt joints with a Ni-based filler material. To maintain stable brazing conditions, the process temperature was successfully regulated by an automatic regulatory device. The required energy transfer field was optimised using Simufact software. Welding parameters and temperatures were validated by means of thermocouples, pyrometers and infrared cameras. All samples were characterised by light optical and scanning electron microscopy. Tensile tests were performed to determine the mechanical properties of both the joints and the fusion zones. The joints were successfully produced by electron beam brazing with a strong interface bond between the filler and the base material. Though brittle phases in the interdendritic region were found, the joints exhibited tensile strengths of up to 358 MPa. |