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Microstructural evolution and mechanical properties of friction stir-welded C71000 copper–nickel alloy and 304 austenitic stainless steel

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Abstract

Dissimilar joints comprised of copper–nickel and steel alloys are a challenge for manufacturers in modern industries, as these metals are not thermomechanically or chemically well matched. The present study investigated the effects of tool rotational speed and linear speed on the microstructure and mechanical properties of friction stir-welded C71000 copper–nickel and 340 stainless steel alloys using a tungsten carbide tool with a cylindrical pin. The results indicated that a rotational-to-linear speed ratio of 12.5 r/mm did not cause any macro defects, whereas some tunneling defects and longitudinal cracks were found at other ratios that were lower and higher. Furthermore, chromium carbide was formed on the grain boundaries of the 304 stainless steel near the shoulder zone and inside the joint zone, directing carbon and chromium penetration toward the grain boundaries. Tensile strength and elongation percentages were 84% and 65% of the corresponding values in the copper–nickel base metal, respectively.

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Acknowledgement

The author acknowledges the funding support of Babol Noshirvani University of Technology (No. BNUT/370167/97).

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  1. Department of Materials and Industrial Engineering, Babol Noshirvani University of Technology, Shariati Avenue, Babol, 4714871167, Iran

    Hamed Jamshidi Aval

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  1. Hamed Jamshidi Aval
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Correspondence to Hamed Jamshidi Aval.

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Aval, H.J. Microstructural evolution and mechanical properties of friction stir-welded C71000 copper–nickel alloy and 304 austenitic stainless steel. Int J Miner Metall Mater 25, 1294–1303 (2018). https://doi.org/10.1007/s12613-018-1682-8

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  • DOI: https://doi.org/10.1007/s12613-018-1682-8

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