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<p>The methods of hydrostatic weighing, x-ray diffraction phase analysis, scanning electron microscopy, spectrum analysis, microindentation and tensile tests are used to analyze the influence of the substrate heating temperature in different modes of selective laser melting (SLM) on the change in the relative density and phase composition, structure, hardness and mechanical properties of alloy Ti – 23Al – 25Nb (O-alloy). Dependences of the relative density, of the crystal lattice parameters of the β- and O-phases, of the hardness, and of the aluminum content on the laser energy density (LED) used in SLM of the O-alloy with substrate temperatures of 600 and 700°C are obtained. The evolution of the porosity and of the structure of the O-alloy in different modes of SLM is determined. The structure in the O-alloy after the SLM with LED = 21 J/mm<sup>3</sup> at substrate temperature 700°C and 30-min aging at 800°C is studied. The aging is shown to produce a beneficial effect on the set of mechanical properties of the O-alloy attest temperatures 600 and 700°C.</p>

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Effect of Selective Laser Melting Mode on the Structure and Properties of an Alloy Based on Ti2AlNb Titanium Aluminide

  • 期刊论文

  • 发表日期：

    2025年7月1日

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  • S. L. Demakov,
  • A. G. Illarionov,
  • S. I. Stepanov,
  • D. V. Grachev,
  • M. A. Shabanov,
  • A. A. Popov

摘要

The methods of hydrostatic weighing, x-ray diffraction phase analysis, scanning electron microscopy, spectrum analysis, microindentation and tensile tests are used to analyze the influence of the substrate heating temperature in different modes of selective laser melting (SLM) on the change in the relative density and phase composition, structure, hardness and mechanical properties of alloy Ti – 23Al – 25Nb (O-alloy). Dependences of the relative density, of the crystal lattice parameters of the β- and O-phases, of the hardness, and of the aluminum content on the laser energy density (LED) used in SLM of the O-alloy with substrate temperatures of 600 and 700°C are obtained. The evolution of the porosity and of the structure of the O-alloy in different modes of SLM is determined. The structure in the O-alloy after the SLM with LED = 21 J/mm3 at substrate temperature 700°C and 30-min aging at 800°C is studied. The aging is shown to produce a beneficial effect on the set of mechanical properties of the O-alloy attest temperatures 600 and 700°C.