Microstructure of a Laser-Welded Joint between a Chromium–Nickel Steel and a Titanium Alloy with a Copper Insert


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Abstract

The microstructure of a laser-welded joint between a chromium–nickel austenitic steel and a titanium alloy with an intermediate copper insert has been studied. Using X-ray diffraction analysis, energy-dispersive X-ray microanalysis, and transmission electron microscopy, it has been shown that the welded joint represents a copper-based solid solution with intermetallic particles of (Fe,Cr)2Ti and Cu3Ti 10–50 μm in size, which were the first to crystallize in the welding pool, and intermetallic particles of (Fe,Cr)2Ti and Cu4Ti with a size of no more than 30 nm, which homogeneously precipitate on cooling from the copper-based solid solution oversaturated at the moment of crystallization. The fracture of the joint upon tensile tests occurred along the diffusion zone at the boundary with the titanium alloy. The maximum ultimate tensile strength of such a joint was 474 MPa.

About the authors

N. B. Pugacheva

Institute of Engineering Science, Ural Branch, Russian Academy of Sciences

Author for correspondence.
Email: nat@imach.uran.ru
Russian Federation, Ekaterinburg, 620049

E. I. Senaeva

Institute of Engineering Science, Ural Branch, Russian Academy of Sciences; Ural Federal University n.a. the First President of Russia B.N. Yeltsin

Email: nat@imach.uran.ru
Russian Federation, Ekaterinburg, 620049; Ekaterinburg, 620002

E. G. Volkova

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Email: nat@imach.uran.ru
Russian Federation, Ekaterinburg, 620990

A. V. Makarov

Institute of Engineering Science, Ural Branch, Russian Academy of Sciences; Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences; Ural Federal University n.a. the First President of Russia B.N. Yeltsin

Email: nat@imach.uran.ru
Russian Federation, Ekaterinburg, 620049; Ekaterinburg, 620990; Ekaterinburg, 620002

L. S. Goruleva

Institute of Engineering Science, Ural Branch, Russian Academy of Sciences

Email: nat@imach.uran.ru
Russian Federation, Ekaterinburg, 620049

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