Roughness and microhardness of UFG Grade 4 titanium under abrasive-free ultrasonic finishing

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Abstract

Increasing the fatigue resistance of implants is an important scientific and technical problem. One of the solutions to this problem is the high-strength state formation due to the ultrafine-grained (UFG) structure. However, high-strength alloys are characterized by greater sensitivity to stress concentrators and the surface roughness parameter. In turn, implant designs, as a rule, imply the presence of concentrators in the form of various grooves, threaded elements, etc., and the manufacturing technology supposes mechanical processing with an ambiguous effect on a finished product surface. The application of additional surface finishing, for example, abrasive-free ultrasonic finishing (AFUF), is a solution to this problem. This work aims to study the effect of different AFUF modes on the microhardness and roughness of a cylindrical blank made of Grade 4 commercially pure titanium in the UFG state. During the study, the authors assessed the effect of the rotation frequency of a workpiece and the static force of pressing the tool against the processed workpiece on the surface parameters; carried out microstructural studies of the obtained samples. The results showed that processing titanium in the UFG state by the AFUF method leads to a significant increase in the surface microhardness and a decrease in its roughness. For example, depending on the mode, the increase in microhardness can reach from 2 to 3.5 times. The authors investigated the effect of a power level of ultrasonic treatment on roughness and microhardness and considered various variants of surface pretreatment. The study identified that an increase in the speed of rotation of a workpiece reduces the roughness of a machined workpiece, while the microhardness increases.

About the authors

Rashid N. Asfandiyarov

Institute of Physics of Molecules and Crystals of Ufa Federal Research Center of the Russian Academy of Sciences, Ufa;
Ufa State Aviation Technical University, Ufa

Author for correspondence.
Email: a.r.n@list.ru
ORCID iD: 0000-0002-5522-4314

PhD (Engineering), researcher, assistant professor of Chair of Materials Science and Physics of Metals

Russian Federation

Georgy I. Raab

Nosov Magnitogorsk State Technical University, Magnitogorsk

Email: giraab@mail.ru

Doctor of Sciences (Engineering), leading researcher

Russian Federation

Dmitry V. Gunderov

Institute of Physics of Molecules and Crystals of Ufa Federal Research Center of the Russian Academy of Sciences, Ufa;
Ufa State Aviation Technical University, Ufa

Email: dimagun@mail.ru
ORCID iD: 0000-0001-5925-4513

Doctor of Sciences (Physics and Mathematics), leading researcher of the Institute of Physics of Molecules and Crystals, professor of Chair of Materials Science and Physics of Metals

Russian Federation

Denis A. Aksenov

Institute of Physics of Molecules and Crystals of Ufa Federal Research Center of the Russian Academy of Sciences, Ufa;
Ufa State Aviation Technical University, Ufa

Email: aksyonovda@mail.ru
ORCID iD: 0000-0002-2652-2646

junior researcher

Russian Federation

Arseniy G. Raab

Ufa State Aviation Technical University, Ufa

Email: agraab@mail.ru

PhD (Engineering), researcher

Russian Federation

Sofia D. Gunderova

Ufa State Aviation Technical University, Ufa

Email: gynderova@mail.ru

student

Russian Federation

Mariya A. Shishkunova

Ufa State Aviation Technical University, Ufa

Email: shishkunomashaa@gmail.com

graduate student

Russian Federation

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