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<p>A comparative analysis of microstructures and phase compositions of various zones of welded joints of titanium alloy VT6 (Ti – 6Al – 4V) obtained by rolling and by selective laser melting (SLM) performed with different electron beam welding (EBW) parameters is carried out. Bead-on-plate electron beam welding is implemented by single-pass displacement of the electron beam across rolled and SLM Ti – 6Al – 4V samples. The results of the metallographic studies demonstrate the influence of the initial microstructure of the Ti – 6Al – 4V alloy and of the EBW beam current on the sizes of the primary grains and plates of the martensitic α/α′ phase formed in the weld and in the heat-affected zone. The volume fraction of the residual β-phase, the crystal lattice parameters of the α/α′ and β-phases, and the magnitude of residual stresses in the welds of the studied samples are measured by x-ray diffraction.</p>

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Simulation of the Thermal Cycle of Electron-Beam Welding of Alloy VT6 (Ti – 6Al – 4V) Obtained by Rolling and Selective Laser Melting. 2. Comparative Analysis of Microstructures and Phase Compositions

  • 期刊论文

  • 发表日期：

    2025年11月1日

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  • A. A. Yakhin,
  • A. V. Panin

摘要

A comparative analysis of microstructures and phase compositions of various zones of welded joints of titanium alloy VT6 (Ti – 6Al – 4V) obtained by rolling and by selective laser melting (SLM) performed with different electron beam welding (EBW) parameters is carried out. Bead-on-plate electron beam welding is implemented by single-pass displacement of the electron beam across rolled and SLM Ti – 6Al – 4V samples. The results of the metallographic studies demonstrate the influence of the initial microstructure of the Ti – 6Al – 4V alloy and of the EBW beam current on the sizes of the primary grains and plates of the martensitic α/α′ phase formed in the weld and in the heat-affected zone. The volume fraction of the residual β-phase, the crystal lattice parameters of the α/α′ and β-phases, and the magnitude of residual stresses in the welds of the studied samples are measured by x-ray diffraction.