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| Abstract No.: |
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Scheduled at:
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Tuesday, June 21, 2022, Saal Brüssel 5:00 PM
Properties of brazed joints
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| Title: |
Microstructural influence of current assisted brazing on properties of nickel brazing alloys
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| Authors: |
Julian Hebing / Surface Engineering Institute, RWTH Aachen University, Germany
Kirsten Bobzin / Surface Engineering Institute, RWTH Aachen University, Germany
Hendrik Heinemann*/ RWTH Aachen University, Germany
Julian Hebing/ Surface Engineering Institute, RWTH Aachen University, Germany
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| Abstract: |
During operation as die-casting molds, hardened hot work tool steels experience high dynamic stresses. The brazing of hot work steels with Ni-based filler metals generally results in brittle intermetallic phases in the brazed seam, which limit the service life under dynamic conditions. In this study the impact of electric-current assisted brazing (ECAB) on the microstructural formation in the brazed seam will be linked to the low cycle fatigue (LCF) behavior of these joints. The influence of the applied current on the microstructural development between the Ni-based brazing filler metal and the hot work steel is analyzed and evaluated by SEM/EDS. Brazed joints were subjected to tension-compression fatigue tests. ECAB demonstrated positive effects on the composition and phase fractions in the brazed seam, thereby affecting the fatigue life of ECAB joints. Minimal research has focused on the brazed joint metallurgy of ECAB joints. The LCF behavior of ECAB joints has been probed for the first time. Insight into the fatigue properties of these joints is essential for future application of the ECAB method to improve the service life of hot work steel molds.
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