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Effect of post weld heat treatment on mechanical and corrosion behaviors of niTi and stainless steel laser-welded wires

Mirshekari, G. R ; Sharif University of Technology | 2016

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  1. Type of Document: Article
  2. DOI: 10.1007/s11665-016-2034-3
  3. Publisher: Springer New York LLC , 2016
  4. Abstract:
  5. 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
  6. Keywords:
  7. Laser welding ; NiTi shape memory alloy ; Alloy steel ; Corrosion ; Corrosion resistance ; Corrosive effects ; Heat resistance ; Heat treatment ; Intermetallics ; Laser beam welding ; Mechanical properties ; Nickel ; Shape memory effect ; Tensile strength ; Welding ; Welds ; Wire ; 304 stainless steel ; Corrosion behavior ; NiTi shape memory alloys ; Post weld heat treatment ; Shape memory wires ; Vital effects ; Weld joints ; Stainless steel
  8. Source: Journal of Materials Engineering and Performance ; 2016 , Pages 1-8 ; 10599495 (ISSN)
  9. URL: https://link.springer.com/article/10.1007%2Fs11665-016-2034-3