Journal
HIGH TEMPERATURE MATERIALS AND PROCESSES
Volume 34, Issue 4, Pages 347-351Publisher
WALTER DE GRUYTER GMBH
DOI: 10.1515/htmp-2014-0048
Keywords
mo-Cu composite; Ni-Cr-P filler metal; vacuum brazing; microstructure
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Funding
- Foundation of National Natural Science Foundation [51005135]
- autonomy innovation Foundation of Shandong University [2010TS068]
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The brazing of Mo-Cu composite and 304 stainless steel was carried out in vacuum with Ni-Cr-P filler metal at 980 degrees C for 20 min. Microstructure in Mo-Cu/304 stainless steel joint was investigated by field-emission scanning electron microscope (FE-SEM) with energy dispersive spectrometer (EDS) and shear strength was measured by shearing test. The results indicate that shear strength of the Mo-Cu/304 stainless steel joint is about 155 MPa. There forms eutectic structure of gamma-Ni solid solution with Ni3P in the braze seam. Ni-Cu(Mo) and Ni-Fe solid solution are at the interface beside Mo-Cu composite and 304 stainless steel, respectively. Shear fracture exhibits mixed ductile-brittle fracture feature with trans-granular fracture, ductile dimples and tearing edges. Fracture originates from the interface between brazing seam and Mo-Cu composite and it propagates to the braze seam due to the formation of brittle Ni5P2 and Cr3P precipitation.
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