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0215U009425,
0115U004312
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Formation of functional surface layer with new properties for titanium alloy of medical purpose
Trush Vasyl,
20-01-2016
Karpenko Physico-Mechanical Institute of the National Academy of Science of Ukraine
It was shown that by increasing the partial pressure of nitrogen (pN2) from 1 to 105 Pa and temperature of nitriding (ТА) from 850 to 900оС the thickness of nitride (from 3 to 8 m) and diffusion (70 ? 130 m) layers formed on VT6 titanium alloy increases. The content of TiN phase in the nitride layer in the first case increases to 67 %, while the second - decreases to 58 %. At the same time the composition of titanium mononitride approaches the stoichiometric composition, which correlates with increase of TiN lattice parameter: 0,4239 nm ? 0,4248 nm. It was determined that in the process of nitriding the nitrided layer which contains nitride (TiN and Ti2N) and diffusion (a solid solution of nitrogen in titanium, ?-Ti(N)) layers was formed. The portion of each titanium nitride in the nitride layer, the size and quality of the nitrided layers depend on the temperature and pressure factors at nitriding. It was shown that there is the tendency to internal stress relaxation by increasing ТА, and the stress state is strengthened significantly at high pN2. The izotropic character of the internal stress distribution was determined. By increasing pN2 the size of crystallites titanium mononitride were increased from 54,82 to 69,17 nm and ТА - up to 91,59 nm. The influence of pN2 and ТА on the morphology of the surface was investigated. It was determined that increase of pN2 and ТА leads to an increase of height parameters of surface profile in 2,3 times and 1,7 times, respectively, and foot-pace parameters - decrease. To sum up, the increase of both parameters of nitriding pN2 and ТА worsen the quality of alloy surface on one quality class: Ra increases from 0,13 to 0,71 m.
Проскурняк Роман Васильович
Ткачук Олег Володимирович
2020-04-02
Updated: 2025-12-07
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