Оn wear resistance of steel-containing composites under extreme friction conditions

The interrelation between the mechanisms of surface layer deterioration of powder composites and the elemental compositions of their primary structures under extreme conditions of friction was studied. Extreme conditions were set by sliding under high pressure (higher 100 MPa) in boundary lubrication or by dry sliding under high density electric current (higher 100 A/cm2). It caused plastic deformation of the surface layers and their deterioration due to lowcycle fatigue. High wear resistance of materials in such conditions should be achieved due to satisfactory stress relaxation in the surface layers. It was suggested that stresses should be relaxed due to local plastic deformation in vicinity of the emerging stress concentrators. The ease of plastic deformation (and ease of relaxation) should be ensured by reducing the doping of the composites structural components, i.e. due to the lack of solid solutions. It was shown that the composites having the Cu – steel (alloy) – TiC compositions obtained by the method of self-propagating high-temperature synthesis with simultaneous pressing of the burning charge had strong adhesion in the sliding contact and showed low wear resistance under high pressures boundary friction. The absence of solid solutions in the primary structure of the Cu – Fe – TiC composite corresponded to high wear resistance due to the absence of adhesion in the contact and easy stress relaxation. Composites of Cu – steel-graphite compounds, made by sintering in vacuum, showed strong adhesion in a dry sliding electrical contact and low wear resistance due to the high content of alloying elements. It was noted that the absence of solutions in the composite composition of Cu – Fe – graphite caused the absence of adhesion in contact and the corresponding high wear resistance. In addition, stresses in the surface layer were also relaxed by the formation of FeO oxide in the contact space during sliding with the current collector. Composites containing solid solutions were not capable of forming FeO oxide on the sliding surface. It was an additional reason for the low wear resistance realization. It was noted that solid solutions caused a decrease in the thermal conductivity of the surface layer. Therefore, it led to an increase in temperature gradients on the sliding surface and to a сorresponding acceleration of the friction zone deterioration.

1. Kragelsky I.V., Dobychin M.N., Kombalov V.S. Friction and Wear. Calculation Methods. New York: Pergamon Press, 1982, 450 p.

2. Ulutan M., Celik O.N., Gasan H., Er U. Effect of different surface treatment methods on the friction and wear behavior of AISI 4140 steel. J. Mater. Sci. Technol. 2010, vol. 26, no. 3, pp. 251–257.

3. Kato H., Todaka Y., Umemoto M., Haga M., Sentoku E. Sliding wear behavior of sub-microcrystalline pure iron produced by highpressure torsion straining. Wear. 2015, vol. 336-337, pp. 58–68.

4. Bansa D.G., Eryilmaz D.G., Blau P.J. Surface engineering to improve the durability and lubricity of Ti–6Al–4V alloy. Wear. 2011, vol. 271, no. 9, pp. 2006–2015.

5. Blau P.J. Friction Science and Technology–From Concepts to App­ lications. Boca Raton, FL: Taylor and Francis CRC Press, 2008, 405 p.

6. Rajkumar K., Aravindan S. Tribological performance of microwave sintered copper–TiC–graphite hybrid composites. Tribology International. 2011, vol. 44, no. 4, pp. 347–358.

7. Çelikyürek I., Körpe N.Ö., Ölçer Tuğba, Gürler R. Microstructure, Properties and Wear Behaviors of (Ni3Al)p Reinforced Cu Matrix Composites. J. Mater. Sci. Technol. 2011, vol. 27, no. 10, pp. 937–943.

8. Wang X., Wei. X., Hong X., Yang J., Wang W. Formation of sliding friction-induced deformation layer with nanocrystalline structure in T10 steel against 20CrMnTi steel. Applied Surface Science. 2013, vol. 280, pp. 381–387.

9. Fang Y.L., Wang H.M. High-temperature sliding wear resistance of a ductile metal-toughened Cr13Ni5Si2 ternary metal silicide alloy. Journal of Alloys and Compounds. 2007, vol. 433, pp. 114–119.

10. Glezer А.M., Metlov L.S. Physics of megaplastic (severe) deformation in solids. Physics of the Solid State. 2010, vol. 52, no. 6, pp. 1162–1169.

11. Egorushkin V.E., Panin V.E., Panin A.V. Influence of multiscale localized plastic flow on stress-strain patterns. Phys. Mezomech. 2015, vol. 18, no. 1, pp. 8–12.

12. Polukhin P.I., Gorelik S.S., Vorontsov V.K. Fizicheskie osnovy plasticheskoi deformatsii. Uchebnoe posobie dlya vuzov [Physical basis of plastic deformation. Tutorial for universities]. Moscow: Metallurgiya, 1982, 584 p. (In Russ.).

13. Biermann H., Beyer G., Mughrabi H. Low-cycle fatigue of a metal-matrix composite: Influence of pre-straining on the fatigue life. Materials Science and Engineering: A. 1997, vol. 234-236, pp. 198–201.

14. Tushinskii L.I., Poteryaev Yu.P. Problemy materialovedeniya v tribologii [Materials science problems in tribology]. Novosibirsk: NETI, 1991, 64 p. (In Russ.).

15. Fadin V.V., Kolubaev A.V., Aleutdinova M.I. Friction of composites based on titanium carbide produced by the process combustion method. Journal of Friction and Wear. 2011, vol. 32, no. 6, pp. 608–613.

16. Braunovich M., Konchits V.V., Myshkin N.K. Electrical contacts. Fundamentals, Applications and Technology. London, New York: CRC Press, 2006, 639 p.

17. Aleutdinova M.I. Characteristics of a contact zone of metal composites under dry friction and electric current passing. Voprosy materialovedeniya. 2012, vol. 70, no. 2, pp. 102–108. (In Russ.).

18. Bogdanovich P.N., Prushak V.Ya. Trenie i iznos v mashinakh. Ucheb. dlya vuzov [Friction and wear in machines. Textbook for universities]. Minsk: Vysshaya shkola, 1999, 374 p. (In Russ.).

19. Fadin V.V., Aleutdinova M.I., Potekaev A.I., Kulikova O.A. The surface layer states in metallic materials subjected to dry sliding and electric current. Russian Physics Journal. 2017, vol. 60, no. 5, pp. 908–914.

20. Aleutdinova M.I., Fadin V.V. Characteristics of dry sliding electric contact of metals in conditions of catastrophic wearing. Izvestiya. Ferrous Metallurgy. 2019, vol. 62, no. 2, pp. 103–108. (In Russ.).

21. Sarychev V.D., Gromov V.E., Nevskii S.A., Nizovskii A.I., Konovalov S.V. Nanolayers formation at hydrodynamic instability devely effects. Izvestiya. Ferrous Metallurgy. 2016, vol. 59, no. 10, pp. 679–687. (In Russ.).