ВПЛИВ ДИФУЗІЙНОГО НАВУГЛЕЦЮВАННЯ ПРИПОВЕРХНЕВОГО ШАРУ МЕТАЛУ НА ЗБІЛЬШЕННЯ ВТОМНОЇ ДОВГОВІЧНОСТІ ТИТАНУ ТА ЙОГО СПЛАВІВ

Василь Степанович Труш; Ірина Миколаївна Погрелюк; Олександр Геннадійович Лук’яненко

doi:10.20535/kpisn.2021.3.236275

Vol. · Issue 3 · 2021 Dec 15, 2021 article

INFLUENCE OF DIFFUSION CARBONIZING OF THE SURFACE METAL LAYER ON INCREASING THE FATIGUE LIFE OF TITANIUM AND ITS ALLOYS

Vasyl S. Trush Corresponding Karpenko Physico-Mechanical Institute of the NAS of Ukraine, Ukraine Ukraine

Iryna M. Pohrelyuk Karpenko Physico-Mechanical Institute of the NAS of Ukraine, Ukraine Ukraine

Alexander G. Luk’yanenko Karpenko Physico-Mechanical Institute of the NAS of Ukraine, Ukraine Ukraine

PublishedDec 15, 2021

PDF (Ukrainian)

KPISN 3 VOL · 3

VOL · ISS 3 · 2021 View issue

Abstract

Background. The presence of a carbon-enriched near-surface layer affects the fatigue properties of titanium. Depending on the saturation conditions, the carburized layer can consist of a carbide phase and/or a diffusion layer (interstitial solid solution based on carbon). The formation of only a diffusion layer without a carbide phase, can serve as a means for increasing the durability of titanium under alternating loading. Therefore, it becomes necessary to establish the parameters of the carburized layer (the level of surface hardening K and the hardened layer thickness l ), which will provide an increase in fatigue properties. Objective. The purpose of the paper is to establish the effect of thermal diffusion saturation with carbon from a gas medium on the durability of titanium alloys. Methods. Carburizing of titanium alloys in a carbon-containing gas mixture has been carried out. On titanium alloys, only an interstitial solid solution based on carbon is formed with different levels of surface hardening – K and the hardened layer thickness – l . Fatigue tests of specimens were carried out under conditions of pure bending and bending with rotation. Results. The influence of the surface hardening level K of the VT1-0 titanium on the fatigue life in low-cycle pure bending is shown and its optimal value is revealed. The fatigue strength of the carburized VT5 and OT4-1 titanium alloys in bending with rotation with different levels of surface hardening K is presented. The dislocation structure of the VT1-0 alloy in the initial state and at the optimal level of surface hardening is investigated. Conclusions. It was found that the fatigue life of the carburized VT1-0 titanium specimens in pure bending increases at the level of surface hardening K = 90% and the hardened layer thickness l = 20 μm. It was found that the fatigue strength of specimens from the VT5 and OT4-1 alloys in bending with rotation increases at the level of surface hardening K = 90%. It was revealed that an ordered dislocation structure is formed on the VT1-0 titanium at the optimal level of surface hardening K = 90%.

Keywords

#titanium alloy #diffusion carbon saturation #fatigue life #fatigue strength #pure bending #bending with rotation

References

G. Lütjering and J.C. Williams, Titanium, 2nd ed. Berlin, Germany: Springer-Verlag Heidelberg, 2007, 442 p. doi: 10.1007/978- 3-540-73036-1.
V. N. Moiseyev, Titanium Alloys. Russian Aircraft and Aerospace Applications. Boca Raton: Taylor & Francis Group, 2006.
H. Güleryüz, E. Atar, F. Seahjani, and H. Çimenoğlu, “An overview on surface hardening of titanium alloys by diffusion of interstitial atoms,” Diffus. Found., vol. 4, pp. 103–116, 2015, doi: 10.4028/www.scientific.net/df.4.103.
A. B. Kolomenskii, B. A. Kolachev, A. V. Degtyarev, and A. N. Roshchupkin, “Effect of the depth of removal of the gas-saturated layer on repeated static endurance and activity of OT4 and VT6ch titanium alloys,” Soviet Mater. Sci., vol. 27, no. 3, pp. 233–236, 1992. doi: 10.1007/bf00729045.
B. A. Kolachev, A. V. Mal’kov, and V. I. Sedov, “Effect of carbon on structure and plasticity of beta titanium alloys,” Metal Sci. Heat Treatment, vol. 17, no. 3, pp. 226–228, Mar. 1975, doi: 10.1007/bf00663687.
M. V. Diamanti, S. Codeluppi, A. Cordioli, and M. P. Pedeferri, “Effect of thermal oxidation process on fatigue behavior of Ti-4Al-2V alloy,” Surface Coatings Technol., vol. 203, no. 3–4, pp. 199–203, 2008, doi: 10.1080/17458080902769937.
V. M. Fedirko, A. G. Luk’yanenko, I. M. Pohrelyuk, and V. S. Trush, “Increasing the serviceability of products from single-phase titanium alloys by thermochemical treatment,” Mater. Performance Characterization, vol. 6, no. 4, p. 20160071, Sep. 2017, doi: 10.1520/MPC20160071.
T. B. Massalski, H. Okamoto, P. R. Subramanian, and L. Kacprzak, Eds., Binary Alloy Phase Diagrams, 2nd ed., vol. 3. ASM International, 1990.
Е. B. Trostyanskaya et all, New materials in technology: textbook for technical colleges, E. B. Trostyanskaya, B. A. Kolachev, and S. I. Silvestrovich, Eds., Moscow, USSR: Chemistry, 1964.
Methods for mechanical testing of metals. Fatigue Test Methods, GOST 25.502-79, 1986.
Testing of metals; rotating bar bending fatigue test, DIN 50113, 1982.
H. H. Maksymovych, Micromechanical studies of the properties of metals and alloys. Kyiv, Ukraine: Naukova Dumka, 1974.
H. H. Maksymovych, B. M. Savchin, S. M. Kudlak, and E. M.Lyutiy, Micromachines for testing materials for low-cycle fatigue by the pure bending method. Lviv, Ukraine: IPM, 1977.
H. J. Frost, Deformation-Mechanism Maps: The Plasticity and Creep of Metals and Ceramics. Pergamon Press, 1982.

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§ 06 — Related

[1] G. Lütjering and J.C. Williams, Titanium, 2nd ed. Berlin, Germany: Springer-Verlag Heidelberg, 2007, 442 p. doi: 10.1007/978- 3-540-73036-1.

[2] V. N. Moiseyev, Titanium Alloys. Russian Aircraft and Aerospace Applications. Boca Raton: Taylor & Francis Group, 2006.

[3] H. Güleryüz, E. Atar, F. Seahjani, and H. Çimenoğlu, “An overview on surface hardening of titanium alloys by diffusion of interstitial atoms,” Diffus. Found., vol. 4, pp. 103–116, 2015, doi: 10.4028/www.scientific.net/df.4.103.

[4] A. B. Kolomenskii, B. A. Kolachev, A. V. Degtyarev, and A. N. Roshchupkin, “Effect of the depth of removal of the gas-saturated layer on repeated static endurance and activity of OT4 and VT6ch titanium alloys,” Soviet Mater. Sci., vol. 27, no. 3, pp. 233–236, 1992. doi: 10.1007/bf00729045.

[5] B. A. Kolachev, A. V. Mal’kov, and V. I. Sedov, “Effect of carbon on structure and plasticity of beta titanium alloys,” Metal Sci. Heat Treatment, vol. 17, no. 3, pp. 226–228, Mar. 1975, doi: 10.1007/bf00663687.

[6] M. V. Diamanti, S. Codeluppi, A. Cordioli, and M. P. Pedeferri, “Effect of thermal oxidation process on fatigue behavior of Ti-4Al-2V alloy,” Surface Coatings Technol., vol. 203, no. 3–4, pp. 199–203, 2008, doi: 10.1080/17458080902769937.

[7] V. M. Fedirko, A. G. Luk’yanenko, I. M. Pohrelyuk, and V. S. Trush, “Increasing the serviceability of products from single-phase titanium alloys by thermochemical treatment,” Mater. Performance Characterization, vol. 6, no. 4, p. 20160071, Sep. 2017, doi: 10.1520/MPC20160071.

[8] T. B. Massalski, H. Okamoto, P. R. Subramanian, and L. Kacprzak, Eds., Binary Alloy Phase Diagrams, 2nd ed., vol. 3. ASM International, 1990.

[9] Е. B. Trostyanskaya et all, New materials in technology: textbook for technical colleges, E. B. Trostyanskaya, B. A. Kolachev, and S. I. Silvestrovich, Eds., Moscow, USSR: Chemistry, 1964.

[10] Methods for mechanical testing of metals. Fatigue Test Methods, GOST 25.502-79, 1986.

[11] Testing of metals; rotating bar bending fatigue test, DIN 50113, 1982.

[12] H. H. Maksymovych, Micromechanical studies of the properties of metals and alloys. Kyiv, Ukraine: Naukova Dumka, 1974.

[13] H. H. Maksymovych, B. M. Savchin, S. M. Kudlak, and E. M.Lyutiy, Micromachines for testing materials for low-cycle fatigue by the pure bending method. Lviv, Ukraine: IPM, 1977.

[14] H. J. Frost, Deformation-Mechanism Maps: The Plasticity and Creep of Metals and Ceramics. Pergamon Press, 1982.

INFLUENCE OF DIFFUSION CARBONIZING OF THE SURFACE METAL LAYER ON INCREASING THE FATIGUE LIFE OF TITANIUM AND ITS ALLOYS

Abstract

Keywords

References

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