Physical and chemical aspects of the study of clusters, nanostructures and nanomaterials. Founded at 2009

Influence of the structural factor on the tribological characteristics of titanium alloy obtained by selective electron beam melting

L.E. Afanasieva, V.V. Izmailov, M.V. Novoselova

Tver State Technical University

DOI: 10.26456/pcascnn/2025.17.XXX

Original article

Abstract: The article is devoted to an experimental study of the influence of microstructure features of the Ti – 6Al – 4V alloy obtained by electron beam melting technology on the tribological properties: hardness; friction coefficient; abrasive wear resistance. The microstructure of the alloy consists of colonies α′-plates 1.5…2 μm thick and interlayers of the β-phase 0.2 μm in size. Hardness was measured at low loads N = 1-2 N (microhardness) and at loads N = 90–180 N (indentation hardness). The friction coefficient was determined on a microtribometer according to the ball-plane scheme in a pair with a steel indenter at loads of 2-5 mN. Wear resistance was studied by friction against a fixed abrasive according to the ball-plane scheme. The microstructure and properties of the samples were studied in two mutually perpendicular planes: in the layer and in the direction of synthesis. Anisotropy of microhardness and friction coefficient under low loads was revealed. In the layer plane, the microhardness under loads of several newtons is 900…1000 MPa lower than on the lateral surface of the sample. Under low contact loads, the friction coefficient in the contact of a spherical steel sample with a flat layer surface is approximately 20% lower than in the contact of the same steel sample with the lateral surface of a titanium alloy sample. With increasing contact load, the difference in properties disappears. Abrasive wear resistance in the direction of sample synthesis is 30% higher than in the layer plane, which is explained by the role of the structural factor. It is shown that the orientation of the colonies of α′-plates has a decisive effect on the tribological properties.

Keywords: titanium alloy, selective electron beam melting, microstructure, hardness, friction coefficient, wear resistance

  • Ludmila E. Afanasieva – Ph. D., Docent, Metal Technology and Materials Science Department, Tver State Technical University
  • Vladimir V. Izmailov – Dr. Sc., Professor, Applied Physics Department, Tver State Technical University
  • Marina V. Novoselova – Ph. D., Docent, Applied Physics Department, Tver State Technical University

Reference:

Afanasieva L.E., Izmailov V.V., Novoselova M.V. Vliyanie strukturnogo faktora na tribologicheskie kharakteristiki titanovogo splava, poluchennogo po tekhnologii selektivnogo elektronno-luchevogo plavleniya [Influence of the structural factor on the tribological characteristics of titanium alloy obtained by selective electron beam melting], Fiziko-khimicheskie aspekty izucheniya klasterov, nanostruktur i nanomaterialov [Physical and chemical aspects of the study of clusters, nanostructures and nanomaterials], 2025, issue 17, pp. __-__. DOI: 10.26456/pcascnn/2025.17.XXX. ⎘

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