TRIBOLOGICAL CHARACTERISTICS OF NITRIDED IN PLASMA GLOW DISCHARGE SAMPLES FROM TITANIUM ALLOY VT5 IN PAIRS WITH DIFFERENT MATERIALS
DOI:
https://doi.org/10.18372/0370-2197.3(96).16830Keywords:
titanium alloys, nitriding, tribological characteristics, friction, wear resistanceAbstract
One of the modern methods of improving operating characteristics of titanium and titanium-based alloys under conditions of friction and increased contact loads is the method of ion-plasma nitriding. The effect of nitriding of VT5 alloy in the plasma of a glow discharge excited in a hollow cathode on its tribological characteristics in pairs with different materials in T-1 fuel and under dry friction conditions has been studied. For research and tribological tests, samples of VT5 alloy were nitrided in the plasma of a glow discharge excited in a hollow cathode at a temperature of 975 ± 15 ° C and a pressure of 58 ± 2 PA in a nitrogen-argon gas mixture with a nitrogen content of 78 %. Studies of samples of BT5 alloy after nitriding showed that the surface roughness Ra was in the range of 0.58-0.64, and the surface hardness HV5 was 525 ± 20 kgf/mm² at a base hardness of 325 ± 15 kgf/mm². Tribological tests were performed on a friction machine 2070 SMT-1 according to the scheme "cube - roller". Tests under conditions of friction with oil were performed at a load of 200 N. The sliding speed during the tests was 1.3 m/s, the test time was 75 sec. The test under dry friction conditions was carried out at a load of 100 N and a sliding speed of 0.785 m / s, the test time was 30 minutes. Low wear ability in relation to the nitrided titanium alloy VT5 (<2.4x10-4 mm3 / sec), as well as friction coefficients at the level of 0.08 to 0.12 in the order of their growth had bronze BrSu3N3Ts3S20F0,2, Br.O10S2NZ, BrSu6F0,9, steel SHH-15, cast iron VCH2169-2, cemented steel 20H3MVF.
References
Eremenko V. N. Tytan y eho splavы/ Eremenko V. N. // – Kyѐv – Yzd. AN UCCP – 1960 – 500 c.
Zhechevaa A. Enhancing the microstructure and properties of titanium alloys through nitriding and other surface engineering methods / A. Zhechevaa, W. Shaa, S. Malinovb, A. Long // Surface and Coatings Technology – Volume 200 – Issue 7 – 21 December 2005 – rr. 2192–2207.
Sarma B. Recent advances in surface hardening of titanium / B Sarma. K. S. Ravi Chandran // JOM - volume – 63 – 2011 – rp. 85–92.
Güleryüz H. An Overview on Surface Hardening of Titanium Alloys by Diffusion of Interstitial Atoms /H. Güleryüz, E. Atar, F. Seahjani, H. Çimenoğlu // Diffusion Foundations - 4 – 2015 – rr. 103–116.
Budilov V. V. Ion Nitriding of Titanium Alloys with a Hollow Cathode Effect Application / V. V. Budilov., K. N. Ramazanov, I. V. Zolotov, R. F. Khucnutdinov, S. V. Starovoitov // Journal of Engineering Science and Technology - Review 8 (6) – 2015 – rr. 22 – 24.
Kang, J. Tribological Behavior of Titanium Alloy Treated by Nitriding and Surface Texturing Composite Technology / J. Kang, M. Wang, W. Yue, Z. Fu, L. Zhu, D. She, C. Wang // Materials – 12 – 301 – 2019 – rr. 2–12.
Mashovets N. S. Analysis of the influence of nitriding in a glow discharge on the properties of a titanium alloy / N. S. Mashovets // Problems of Tribologyy – 24 – 3/93 – 2019 – rr. 39–44.
Smyrnov A.E. Yznosostoikost teplostoikoi staly posle vakuumnoi tsementatsyy / A. E. Smyrnov, R. S. Fakhurtdynov, M. Yu. Rizhova, S. A. Pakhomova // Uprochniaiushchye tekhnolohyy y pokrыtyia – 2016 – № 7 – S. 8–13.
