Rules of creating of the double layered structure (bedding) in deformation strengthening layer in the process of titanium alloys spherical products machining

Dmytro A. Sergach 1Yurij A. Tsekhanov 2Sergij Y. Sheykin 1Dmitriy V. Karih 2

1. V. Bakul Institute for Superhard Materials of the National Academy of Sciences of Ukraine (ISM), 2, Avtozavodska Str., Kyiv 04074, Ukraine
2. Voronezh State University (VGU), Universitetskaya Sq., 1, Voronezh 394006, Russian Federation

Abstract

This article describes the possibility of using titanium alloy VT1-0 and VT6 in manufacturing spherical heads for human's hip joint. Low mechanical properties and increased tendency to setting with the majority of materials impede the application of these materials, so the production of titanium heads seems possible on condition of modifications of effective area by applying nitriding. It is known that the properties of the nitrided layer determined by the structure of the surface layer of titanium product. Shredding of the structure and strengthening of the surface layer of the product with CSPD before nitriding, leads to the increasing of the dislocation density and an expansion in the area of inter grain  borders, which extends the depth of the diffusion layer and increases its hardness. We developed a spherical technological scheme of run-up pieces of VT1-0 and VT6 flat surfaces, which strengthens the surface layer of 2 or more times at a thickness of the surface layer of 1 mm or more. Experiments show that during processing, heating of the work piece surface up to 150 ° -200° takes place; combined with volume compression in the contact zone, this provides a high plasticity of the material and cause no defects. Plastic deformations in these conditions lead to the creation of finely dispersed structure and nanostructure in the surface layer, favourable to its further diffusion saturation with nitrogen. Recrystallization and consolidation of crushed grains do not occur

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Presentation: Oral at Nano and Advanced Materials Workshop and Fair, by Dmytro A. Sergach
See On-line Journal of Nano and Advanced Materials Workshop and Fair

Submitted: 2013-06-10 14:51
Revised:   2013-06-10 15:23
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