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Abstract No.: |
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Scheduled at:
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Wednesday, May 22, 2019, Saal Brüssel 11:20 AM Properties of brazed joints 2
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Title: |
Investigation of residual stresses in high-temperature-brazed hybrid Cr-CrNi-steel joints
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Authors: |
Wolfgang Zinn / Universität Kassel
Institut für Werkstofftechnik
Fachgebiet Kunststofftechnik
Metallische Werkstoffe, Germany Wolfgang Zinn* / Universität Kassel, Germany Hans Jürgen Maier/ Leibniz Universität Hannover / Institut für Werkstoffkunde, Deutschland Simon Kresnik/ Leibniz Universität Hannover / Institut für Werkstoffkunde, Deutschland Kai Möhwald/ Leibniz Universität Hannover / Institut für Werkstoffkunde, Deutschland Arnaud Magnier/ Universität Kassel, Germany Berthold Scholtes/ Universität Kassel / Institut für Werkstofftechnik, Deutschland Thomas Niendorf/ Universität Kassel, Germany
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Abstract: |
In many cases, e. g. in vehicle construction, heating or energy technology, manufacturing processes based on brazing technology are applied. In this context many components made of high alloy steels are produced, which are brazed in vacuum or protective gas furnaces at temperatures above 900°C. Often joining of ferritic and austenitic steels is desirable or even necessary. Due to different thermo-mechanical properties of the materials and the braze metal used, high residual stresses can occur, which considerably reduce strength in comparison with joints made of similar steel types. In this project residual stress states are analysed and assessed in detail depending on material combinations, geometries of the joints and the process parameters applied in furnace brazing operations. From that, strategies are derived and evaluated to reduce residual stress in brazed dissimilar joints. As a result, manufacturers should be enabled to produce reliable high-strength hybrid components made of different stainless steel types.
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