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Investigation of Surface Roughness Parameter in Dissimilar Diffusion Brazing of WC-Co to AISI 4145 Steel

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Abstract

In this paper, the influence of surface roughness on microstructure and mechanical properties of AISI 4145 steel/WC-Co joint was investigated. Sessile drop test was conducted to evaluate the spreading behavior of Cu-Zn-Ni filler metal on the substrate with different surface roughness values. SEM micrographs were used to study the microstructure of interface and fracture surface while the mechanical properties of joint zone were compared by shear strength test. The sessile test reveals that an optimized roughness value is needed for the highest wettability. The sample with 0.36 μm surface roughness showed a minimum wetting angles of 15°/22°. The microstructure of filler metal/cemented carbide interface indicates that some defects such as micro-voids are produced when the surface of sample is too smooth. With the increase of surface roughness, the micro-voids disappeared which implies on the positive effect of roughness. However, the exceeding rise in roughness led to the further creation of micro-voids at the interface. Shear strength test also reveals that the defect-free samples show a ductile behavior while the flawed samples have the brittle failure. As a whole, it is indicated that an optimized surface roughness is required for achieving a high-quality brazed joint.

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Acknowledgments

We are thankful for the support of Taradis Tabesh Azma and CylinderSazi Tehran companies in this research.

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Authors and Affiliations

  1. Department of Mining and Metallurgical Engineering, Amirkabir University of Technology (AUT), Tehran, Iran

    Ali Amirnasiri, Nader Parvin & Mahdi Shafiei Haghshenas

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  1. Ali Amirnasiri
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  2. Nader Parvin
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  3. Mahdi Shafiei Haghshenas
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Correspondence to Ali Amirnasiri.

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Recommended for publication by Commission XVII - Brazing, Soldering and Diffusion Bonding

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Amirnasiri, A., Parvin, N. & Haghshenas, M.S. Investigation of Surface Roughness Parameter in Dissimilar Diffusion Brazing of WC-Co to AISI 4145 Steel. Weld World 63, 1833–1840 (2019). https://doi.org/10.1007/s40194-019-00778-1

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  • DOI: https://doi.org/10.1007/s40194-019-00778-1

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