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Laser Joining of Ti3Al-Based Alloy to Ni-Based Superalloy using a Titanium Interlayer

  • Xiao-Long Cai
  • Da-Qian Sun
  • Hong-Mei Li
  • Hong-Ling Guo
  • Yan Zhang
  • Ying-ying Che
Regular Paper

Abstract

Joining Ti3Al-based alloy to Ni-based superalloy is of great interest for applications in the aerospace fields. Direct welding of these two materials was very difficult and the joint usually fractured during laser welding which cannot form an effective welding joint. In this work, a pure titanium interlayer with a thickness of 0.4 mm was used between the base metals. The results indicated that the addition of titanium interlayer has a great effect on the joint performance. No macrocracks were found through the whole joint. The average room-temperature tensile strength of the joint with titanium was 177 MPa which still much lower than the two base metals. The weak link of the dissimilar joint was the Ti3Al/weld interface. The presence of Ti2Ni, α2-Ti3Al and AlNi2Ti brittle intermetallic compounds in the Ti3Al/weld interface deteriorated the joint properties.

Keywords

Dissimilar metals Ti3Al-based alloy Ni-based superalloy Laser welding Intermetallics Mechanical Property 

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Copyright information

© Korean Society for Precision Engineering and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Key Laboratory of Automobile Materials, Ministry of Education, and Department of Materials Science and EngineeringJilin UniversityChangchunChina
  2. 2.State Key Laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchunChina
  3. 3.CRRC Changchun Railway Vehicles Co.,LtdChangchunChina

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