Effect of nitrogen on shape recovery and tensile properties of Ti-Ni alloy weldments - GTA welding of Ti-Ni shape memory alloy (Report 2)

Yoshihiro Sato, Hiroyuki Kokawk, Takeshi Kuwana, Shouichi Sato, Yutaka S. Sato

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Effects of nitrogen on microstructure, shape recovery behavior and tensile property of Ti-Ni alloy weldments were investigated. A near-equiatomic Ti-Ni shape memory alloy was welded by a gas tungsten arc (GTA) welding technique under Ar-N2 welding atmosphere. The nitrogen absorbed into the weld metal increased with rising nitrogen partial pressure and welding current. Second phase particles were observed in the weld metal containing nitrogen. The second phase was identified as TiN by transmission electron microscopy. The shape recovery stress of the weldment was equivalent to that of the base material. As temperature of the weld metal decreased with increasing nitrogen content. Tensile strength of the alloy decreased by welding process, and the further reduction was observed for the weld metal absorbed nitrogen. Elongation also decreased by welding and rising nitrogen content.

Original languageEnglish
Pages (from-to)318-323
Number of pages6
JournalUnknown Journal
Volume18
Issue number2
DOIs
Publication statusPublished - 2000 May

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces, Coatings and Films
  • Metals and Alloys

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