1_2022_sen_6

Title of the article STRUCTURE OF COMMERCIAL TITANIUM SUBJECTED TO LOW-TEMPERATURE ION NITRIDING
Authors

KUKAREKO Vladimir A., D. Sc. in Phys. and Math., Prof., Chief of the Center of Structural Research and Tribo-Mechanical Testing of Materials and Mechanical Engineering Products of Collective Use, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

KONSTANTINOV Valeriy M., D. Sc. in Eng., Prof., Head of the Department “Material Science”, Belarusian National Technical University, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

VERESHCHAK Nikita A., Engineer of the Department “Material Science”, Belarusian National Technical University, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

GRIGORCHIK Aleksandr N., Ph. D. in Eng., Deputy Chief of the Center of Structural Research and Tribo-Mechanical Testing of Materials and Mechanical Engineering Products of Collective Use, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus
In the section MATERIALS SCIENCE IN MECHANICAL ENGINEERING
Year 2022
Issue 1(58)
Pages 48–55
Type of article RAR
Index UDK 621.785.5
DOI https://doi.org/10.46864/1995-0470-2022-1-58-48-55
Abstract The structural-phase state of commercial titanium of grades ВТ1-00 (VT1-00) and ВТ1-0 (VT1-0) has been studied in the initial state and after various types of low-temperature ion nitriding. In the initial state, the VT1-00 and VT1-0 alloys have a single-phase α-Ti structure with a hexagonal close-packed crystal lattice. The hardness of titanium is 140–150 HV 10. It has been shown that ion-beam nitriding of VT1-00 alloy at low temperatures of 350 and 450 °С leads to the formation of thin (up to 5 μm) nitrogen-hardened layers with a hardness of 160–180 HV 0.05. As a result of ion implantation at temperatures of 500 and 550 °C, a nitrogen-modified layer with a microhardness of 190–220 HV 0.05 is formed in the surface layers of the VT1-00 titanium alloy, containing a solid solution of nitrogen in the α-Ti matrix phase. Nitrogen implantation of the VT1-00 alloy at a temperature of 620 °C leads to the formation of titanium nitrides TiN0.26, ε-Ti2N, η-Ti3N2-x in the surface layer of titanium alloy. The microhardness of VT1-00 titanium treated with nitrogen ions at 620 °C increases to 360 HV 0.05. In the case of ion-plasma nitriding (IPN) of VT1-0 titanium at 550 °C for 5 h, a nitrogen-modified layer up to 20 μm deep is recorded in its surface layer, containing isomorphic phases: α-Ti and titanium nitride TiN0.26. The microhardness of the VT1-0 titanium alloy subjected to IPN is 190 HV 0.01.
Keywords commercial titanium, ion-beam nitriding, ion-plasma nitriding, modified layer, solid solution, titanium nitrides, microhardness
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