Influence of Ni Interlayers on the Mechanical Properties of Ti6Al4V/(WC-Co) Friction Welds |
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Authors: | M Shamanian M Salehi A Saatchi T H North |
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Affiliation: |
a Department of Materials Engineering, Isfahan University of Technology, Isfahan, Iran
b Department of Materials Engineering, University of Toronto, Ontario, Canada |
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Abstract: | Ni interlayers were introduced prior to dissimilar friction welding of Ti6Al4V base material to three cemented carbide substrates. The fracture strength of Ti6Al4V/(WC-6 wt% Co) welds were poor and were markedly improved when 20-µm thick Ni interlayers were introduced prior to dissimilar friction welding. These results were only produced when the (WC-6 wt% Co) cermet was electroplated prior to friction welding. When the Ti6Al4V alloy was electroplated prior to friction welding, fractured WC particles and cracking were observed in the (WC-Co) carbide substrate. The fracture strengths of Ti6Al4V/(WC-11 wt% Co) and Ti6Al4V/(WC-24 wt% Co) welds were not improved when 20-µm thick Ni interlayers were introduced prior to friction welding. During mechanical testing, the Ni layer retained at the dissimilar joint interface created a region of weakness. |
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Keywords: | Friction welding Interlayers Ti6Al4V alloy (WC-Co) cermets Joining Dissimilar materials Residual stresses Thermal expansion Three-point bending Weld interface |
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