Effect of surface relief on solid phase joining of heat-resistant nickel superalloys

ABSTRACT

Pressure welding (PW) is an advanced method for obtaining solid phase joints (SPJs). Using physical and finite element modelling (FEM) it is shown that PW under superplasticity conditions provides SPJs between dissimilar cast single-crystal intermetallic and deformed polycrystalline heat-resistant Ni-based superalloys. Special attention is paid to exclude the stagnant zones in the solid phase joining region using surface relief. The results of physical modelling and FEM are in qualitative agreement. It is revealed that the surface relief can decrease the stagnant zone and increase localisation of deformation in the joining region, which helps to improve the joining quality. A monotonous change in microhardness in the joint zone is shown.

KEYWORDS:

• Ni-based superalloy
• Ni₃Al-based superalloy
• pressure welding
• solid phase joint
• superplasticity
• surface relief
• microhardness
• finite element modelling

Disclosure statement

No potential conflict of interest was reported by the authors.

ORCID

A. Kh. Akhunova http://orcid.org/0000-0001-8551-6097

S. V. Dmitriev http://orcid.org/0000-0002-6744-4445

Additional information

Funding

The work was performed under financial support from the Russian Foundation for Basic Research [Grant No. 17-38-50060 mol_nr]. The work of S. V. D. (discussion of the results) was supported by the Tomsk State University Competitiveness Improvement Programme.