The structure of the titanium alloy, modified by electron beams and destroyed during fatigue

S.V. Konovalov, I.A. Komissarova, D. Kosinov, Y.F. Ivanov, O. Ivanova, V. Gromov show affiliations and emails
Received 29 March 2017; Accepted 03 July 2017;
This paper is written in Russian
Citation: S.V. Konovalov, I.A. Komissarova, D. Kosinov, Y.F. Ivanov, O. Ivanova, V. Gromov. The structure of the titanium alloy, modified by electron beams and destroyed during fatigue. Lett. Mater., 2017, 7(3) 266-271
BibTex   https://doi.org/10.22226/2410-3535-2017-3-266-271

Abstract

It was processed by electron beams of a surface of a titanium alloy and the increase of fatigue life is established. Scanning and transmission electron microscopy has been used to study the structure of a titanium alloy modified with electron beams and destroyed by fatigue.The present work is aimed to study the fracture surface and state of the defect substructure after high-cycle fatigue failure of titanium alloy VT1–0 preliminarily subjected to an intense pulsed electron beam irradiation with an electron energy 16 keV, pulse rate 0.3 s–1, pulse duration 150 mcs, beam energy flux density 30 J / cm–2 and the number of pulses 3. Electron beam irradiation led to an enhancement of the fatigue life by 40 % on average with respect to that of unirradiated samples. It has been established that the fatigue fracture has a multilayered character and is characterized by the presence of a surface layer of 20 to 25 μm thickness, an intermediate layer of 50 – 55 μm thickness and the bulk of the material. In the surface layer, a sublayer characterized by the presence of micropores adjacent to the irradiation surface can be distinguished. In order to compare with experimental results, the temperature field has been theoretically calculated. The analysis has shown that irradiation of titanium is accompanied by the formation of a relatively thin (about 25 μm) surface layer, which is formed as a result of rapid crystallization. It is shown that the defect substructure of the surface layer in samples failed by fatigue tests consists of a polycrystalline structure based on α-Ti; in the volume of grains, a dislocation substructure is observed, represented by randomly distributed dislocations or dislocations forming networks. It is established that the structure of samples irradiated by electron beam and failed by fatigue tests significantly differs from the structure revealed in unirradiated titanium samples by a subgrain structure in the volumes of grains in a surface layer with the thickness of 5 μm. On a larger distance from irradiated surface (about 20 to 25 μm), a plate-like substructure is observed in the grains. The state of plate-like structure essentially depends on a distance from the irradiated surface. Namely, a transition from a mixed subgrain and plate-like structure to the plate-like one occurs.

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