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Vacuum Brazing of WC-8Co Cemented Carbides to Carbon Steel Using Pure Cu and Ag-28Cu as Filler Metal

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Abstract

The wetting and spreading behavior of commercial pure Cu and Ag-28Cu alloy on WC-8Co cemented carbide were investigated by the sessile drop technique. The contact angle of both systems obviously decreases with moderately increasing the wetting temperature. Vacuum brazing of the WC-8Co cemented carbide to SAE1045 steel using the pure Cu or Ag-28Cu as filler metal was further carried out based on the wetting results. The interfacial interactions and joint mechanical behavior involving microhardness, shear strength and fracture were analyzed and discussed. An obvious Fe-Cu-Co transition layer is detected at the WC-8Co/Cu interface, while no obvious reaction layer is observed at the whole WC-8Co/Ag-28Cu/SAE1045 brazing seam. The microhardness values of the two interlayers and the steel substrate near the two interlayers increase more or less, while those of WC-8Co cemented carbide substrates adjacent to the two interlayers decrease. The WC-8Co/SAE1045 joints using pure Cu and Ag-28Cu alloy as filler metals obtain average shear strength values of about 172 and 136 MPa, and both of the joint fractures occur in the interlayers.

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Acknowledgments

This work is supported by the National Natural Science Foundation of China (51572112), the Natural Science Foundation of Jiangsu Province (BK20151340), the Six Talent Peaks Project of Jiangsu Province (2014-XCL-002), the Postdoctoral Science Foundation of China (2014M551512), the Innovation/Entrepreneurship Program of Jiangsu Province ([2013]477 and [2015]26), the Qing Lan Project ([2016]15), and the Research and Innovation Project for College Graduates of Jiangsu Province (KYLX15_1058).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Jiangsu University, Zhenjiang, 212013, China

    X. Z. Zhang, G. W. Liu, J. N. Tao, H. C. Shao, H. Fu & G. J. Qiao

  2. Suzhou Pant Piezoelectric Tech Co. Ltd., Suzhou, 215300, China

    G. W. Liu & T. Z. Pan

  3. State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an, 710049, China

    G. J. Qiao

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  1. X. Z. Zhang
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  2. G. W. Liu
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  4. H. C. Shao
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  5. H. Fu
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  7. G. J. Qiao
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Correspondence to G. W. Liu or G. J. Qiao.

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Zhang, X.Z., Liu, G.W., Tao, J.N. et al. Vacuum Brazing of WC-8Co Cemented Carbides to Carbon Steel Using Pure Cu and Ag-28Cu as Filler Metal. J. of Materi Eng and Perform 26, 488–494 (2017). https://doi.org/10.1007/s11665-016-2424-6

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  • DOI: https://doi.org/10.1007/s11665-016-2424-6

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