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

  • G. R. Mirshekari
  • A. Saatchi
  • A. Kermanpur
  • S. K. Sadrnezhaad
Article

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.

Keywords

corrosion behavior laser welding mechanical properties NiTi shape memory alloy post weld heat treatment stainless steel 

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Copyright information

© ASM International 2016

Authors and Affiliations

  • G. R. Mirshekari
    • 1
  • A. Saatchi
    • 1
    • 2
  • A. Kermanpur
    • 1
  • S. K. Sadrnezhaad
    • 3
  1. 1.Department of Materials EngineeringIsfahan University of TechnologyIsfahanIran
  2. 2.Department of Materials Science and EngineeringUniversity of Wisconsin-MadisonMadisonUSA
  3. 3.Department of Materials Science and EngineeringSharif University of TechnologyTehranIran

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