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Effect of Post Weld Heat Treatment on Mechanical and Corrosion Behaviors of NiTi and Stainless Steel Laser-Welded Wires

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Abstract

Effects of post weld heat treatment (PWHT) on mechanical properties and corrosion behavior of NiTi shape memory wire, laser welded to the 304 stainless steel wire were investigated. The results showed that PWHT at 200 °C increased corrosion resistance and tensile strength of the joint up to ~1.8 times that of the as-weld joint, with no heat treatment. On the contrary, precipitation of neoteric intermetallic compounds like Fe2Ti, Cr2Ti, FeNi, Ni3Ti, and Ti2Ni in the welded region deteriorated these properties, when PWHT was conducted at 400 °C. Due to the vital effects of the PWHT performed after the laser welding, careful control of the PWHT temperature was found to be a prerequisite for achievement of desirable properties in the dissimilar NiTi-304 stainless steel laser-welded wires.

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Authors and Affiliations

  1. Department of Materials Engineering, Isfahan University of Technology, Isfahan, 84156-83111, Iran

    G. R. Mirshekari, A. Saatchi & A. Kermanpur

  2. Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, WI, 53706, USA

    A. Saatchi

  3. Department of Materials Science and Engineering, Sharif University of Technology, Tehran, 11365-9466, Iran

    S. K. Sadrnezhaad

Authors
  1. G. R. Mirshekari
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  2. A. Saatchi
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  3. A. Kermanpur
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  4. S. K. Sadrnezhaad
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Correspondence to G. R. Mirshekari.

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Mirshekari, G.R., Saatchi, A., Kermanpur, A. et al. Effect of Post Weld Heat Treatment on Mechanical and Corrosion Behaviors of NiTi and Stainless Steel Laser-Welded Wires. J. of Materi Eng and Perform 25, 2395–2402 (2016). https://doi.org/10.1007/s11665-016-2034-3

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  • DOI: https://doi.org/10.1007/s11665-016-2034-3

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