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Volume 25 Issue 11
Nov.  2018
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文章导航 >  矿物冶金与材料学报（英文）  > 2018  >  25(11): 1294-1303
Hamed Jamshidi Aval, Microstructural evolution and mechanical properties of friction stir-welded C71000 copper-nickel alloy and 304 austenitic stainless steel, Int. J. Miner. Metall. Mater., 25(2018), No. 11, pp. 1294-1303. https://doi.org/10.1007/s12613-018-1682-8
Cite this article as:
Hamed Jamshidi Aval, Microstructural evolution and mechanical properties of friction stir-welded C71000 copper-nickel alloy and 304 austenitic stainless steel, Int. J. Miner. Metall. Mater., 25(2018), No. 11, pp. 1294-1303. https://doi.org/10.1007/s12613-018-1682-8
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研究论文

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

  • Department of Materials and Industrial Engineering, Babol Noshirvani University of Technology, Shariati Avenue, Babol, 47148-71167, Iran

  • 通讯作者:

    Hamed Jamshidi Aval    E-mail: h.jamshidi@nit.ac.ir

  • 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.
    • Research Article

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

    + Author Affiliations
      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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