The effect of induction heat treatment on the surface structure and modulus of elasticity of 3D medical blocks
Marina A. Fomina,1, Vladimir A. Koshuro,1, Aleksandr A. Fomin,1
1 Yuri Gagarin State Technical University of Saratov, Russia
Abstract
The aim of this work was to determine the effect of induction heat treatment (IHT) on the surface structure and elastic modulus of 3D-blocks obtained by the SLM method from Ti-6Al-4V.
Heat treatment was carried out by the IHT method in air at a temperature of 800-1000 ºC and duration 120, 300 s.
After IHT, nano- and submicrometer-sized oxide crystals formed on the surface of the particles. The size of oxide crystals depended on the ITO regimes. The microhardness of the original 3D-blocks varied over the cross section in the range of 140–460 HV, which indicates the uneven distribution of internal stresses and the defectiveness of the structure as a whole. After IHT, the microhardness of the blocks, on average, regardless of the modes, was 200–300 HV. Probably, the metal was annealed during induction treatment. In addition, it was found that there was an insignificant change in the strength properties, namely, the tensile strength decreased, and the elastic modulus changed depending on the IHT modes
As a result of the research, it was found that IHT makes it possible to remove internal stresses in 3D titanium blocks, change the elastic modulus, and form nanosized oxide structures on the metal surface.
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Koshuro Vladimir
Yuri Gagarin State Technical University of Saratov
Russia
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