Effect of Processing Paraments on the Properties of Vacuum Brazed WC-Ni/NiCrMo Alloy Steel Joint
碩士 === 大同大學 === 材料工程學系(所) === 98 === The vacuum brazing of Cemented Tungsten Carbide (WC-Ni) and structural alloy steel using Cu-9Sn braze alloy has been studied. The microstructure observation, hardness and the shear strength of the brazed joint, the effect of the brazing time, interface reaction o...
| Main Authors: | , |
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2010
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| Online Access: | http://ndltd.ncl.edu.tw/handle/83618293315904944821 |
| Summary: | 碩士 === 大同大學 === 材料工程學系(所) === 98 === The vacuum brazing of Cemented Tungsten Carbide (WC-Ni) and structural alloy steel using Cu-9Sn braze alloy has been studied. The microstructure observation, hardness and the shear strength of the brazed joint, the effect of the brazing time, interface reaction of filler and different Ni content in the cermet on the joint behavior have been discussed in the article. The experimental results show that the max shear strength of the joints, 361±13 MPa was derived at 1080°C 15 min. The SEM micrographs showed that many tiny white-spot precipitates were observed in the grain boundaries of the brazed zone and EPMA analysis evidenced that the precipitates were composed of Sn-Ni. The experimental results also manifested that the wettability of WC-Ni/SNCM439 and Cu-9Sn/SNCM439 joints were better than that of the WC-Co/KDA1. After four hours slurry erosion test, the mass loss of WC-Ni/SNCM439 joints was more than those of WC-Co/KDA1 joints have been proved.
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