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Brazing of Martensitic Stainless Steel to Copper Using Electroplated Copper and Silver Coatings
Published in Springer New York LLC
2019
Volume: 28
   
Issue: 2
Pages: 1190 - 1200
Abstract
Brazing of 3 mm thick sheets of low-carbon martensitic stainless steel and Cu-Cr-Zr-Ti alloy was attempted using electroplated coatings of Cu and Ag. Ni coating of 5 µm thick was provided on the MSS base metal to enhance the wettability. Brazing experiments were carried out at 985 °C for a holding of 15 min. Detailed microstructural studies, hardness, lap-shear, tensile, and pressure tests were carried out on the brazed joints. The reaction between the Cu and Ag coatings lead to the formation of in situ braze metal. The microstructure of the braze metal was found to consist of Cu-rich primary alpha (α P ) and Ag-rich eutectic mixture (β + α E ). In lap-shear tests, the brazed joints produced with an overlap of 9 and 6 mm were found to fail in copper base metal, while the joints produced with an overlap of 3 mm failed in the braze metal exhibiting a lap-shear strength of 147 MPa. In tensile tests, the butt brazed joints were found to fail in copper base metal as well with an average tensile strength of 213 MPa. The braze metal hardness was found to be higher than the hardness of the copper base metal. In pressure tests, the brazed panels were found to survive a pressure of 750 bar without undergoing any damage. These results show that electroplated coatings of Cu and Ag can be advantageously utilized for brazing of large, complex-shaped parts such as thrust chambers in space industry. © 2019, ASM International.
About the journal
JournalData powered by TypesetJournal of Materials Engineering and Performance
PublisherData powered by TypesetSpringer New York LLC
ISSN10599495
Open AccessNo
Concepts (22)
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    Brazing
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    Chromium alloys
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    Coatings
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    Hardness
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    Joints (structural components)
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    Low carbon steel
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    Martensitic stainless steel
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    Metal testing
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    Silver
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    Tensile strength
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    Tensile testing
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    Titanium alloys
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    Zirconium alloys
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    CU COATINGS
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    ELECTROPLATED COATING
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    ELECTROPLATED COPPER
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    EUTECTIC MIXTURE
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    LAP SHEAR STRENGTH
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    LAP SHEAR TESTS
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    Micro-structural
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    SILVER COATINGS
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    Copper alloys