Structure and properties of diffusion bonded TA2 to 1Cr18Ni9Ti joints with Ni+Nb composite interlayer

Peng Li, Jing Long Li, Jiang Tao Xiong, Fu Sheng Zhang

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5 Scopus citations

Abstract

Diffusion bonding in vacuum was carried out between commercially pure titanium TA2 and austenitic stainless steel 1Cr18Ni9Ti by using Ni+Nb composite interlayer at the temperature of 840°C, 880°C and 920°C for 60min under 4 MPa axial pressure. The tensile strengths of the joints were tested, meanwhile the fracture surfaces were analyzed by SEM and XRD. The microstructure and element distribution of the joints were analyzed by OM, SEM and EDS. The results show that Ni+Nb composite interlayer successfully suppresses interdiffusion of Ti and Fe, so that the sound joints were formed. Five reacted-layers are presented at the joint. They are FeCrNi solid solution, residual Ni, Ni3Nb, residual Nb, TiNb widmanstatten structure from 1Cr18Ni9Ti to TA2. The residual Ni is critical to strength of the joint, the strength reaches up to 261 MPa and changes a less with temperature.

Original languageEnglish
Pages (from-to)25-29
Number of pages5
JournalHangkong Cailiao Xuebao/Journal of Aeronautical Materials
Volume30
Issue number5
DOIs
StatePublished - Oct 2010

Keywords

  • 1Cr18Ni9Ti
  • Diffusion bonding
  • Ni+Nb composite interlayer
  • Structure and properties
  • TA2

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