Physical and Chemical Conditions of Formation, Structure and Properties of Multicomponent Coatings by the Titanium, Aluminium, Chromium with TiN Barrier Layer on 9HS Steel
DOI:
https://doi.org/10.20535/1810-0546.2016.6.84303Keywords:
9HS steel, Coating, Saturation, Structure, PropertiesAbstract
Background. Methods of alloy treatment with chloride phases have become widespread in chemical and thermal treatment. Chloride gas environments have been successfully used for titanizing, chromizing, aluminizing of metals and alloys. Diffusion saturation of the gas phase has got significant advantages over other methods: high-quality coatings, flexible process control, high performance and efficiency. Study of factors that affect the state of gas environment and directly the phase and chemical composition, structure and properties of coatings is of the great interest.
Objective. The aim of the work is to establish comprehensive thermodynamic conditions of 9HS steel saturation with the layer of nitride TiN by titanium, chromium and aluminum, establishment of the phase composition, structure and properties of coatings and rendering based on the studies of practical recommendations on technical parameters of saturation.
Methods. Multiple saturation of 9HS tool steel was realized in a powder mixture of metals Ti, Al, Cr, NH4Cl activator and Al2O3 inert additives. Counterpoise was estimated in the temperature range 300–1500 K for systems involving saturating metals (Ti, Al, Cr), Cl, C, N, O, elements of base (Fe). Samples with coatings were studied by modern methods of physical material science.
Results. Investigation of gas and condensed state of system Ti–Al–Cr–C–N with different composition in the temperature range 300–1500 K showed a significant probability of 9HS steel saturation by titanium and aluminum, lower by chromium, and formation on surface phases of TiC, TiN. TiN barrier layer inhibits at CTT the division of chromium and aluminum in the outer zones of coatings and promotes on surface layer Cr7C3.
Conclusions. Coatings with microhardness of separate components are formed on 9HS steel with TiN layer after titanium-aluminium chromizing: TiC – 35.6; TiN – 24.5; Cr7C3 – 18.5 GPa. Durability of titanium-aluminium chromi-zing 9HS steel with TiN barrier layer in terms of friction without lubrication is in 13.6 times higher than in the same steel after quenching and low tempering.References
L. Voroshnyn et al., Theory and Technology of Chemical-Thermal Treatment. Moscow, Russia; Minsk, Belarus: Novoe Znanie, 2012 (in Russian).
V. Loskutov et al., Carbide Coating on Steel and Hard Alloys. Ternopil, Ukraine: Lileya, 1998 (in Ukrainian).
Yu. Gurevich et al., Doping with Iron Chloride through the Gas Phase. Sverdlovsk, Russia: Ural Department of the USSR Academy of Sciences, 1992 (in Russian).
V. Hizhnyak et al., “Physical-chemical conditions of application, structure and properties of coatings featuring titanium and aluminum on a technical iron”, Fizika i Himiya Tverdogo Tila, no. 3, pp. 717–722, 2011 (in Ukrainian).
J. Zuno-Silva et al., “Boriding kinetics of Fe2B layers formed on AISI 1045 steel”, J. Min. Mettal. Sect. B-Mettal, vol. 50, iss. 2, pp. 101–107, 2014. doi: 10.2298/JMMB140323019Z
S. Tsipas et al., “Boroaluminide coatings on ferritic-martensitic steel deposited by low-temperature pack cementation”, Surface and Coatings Technology, vol. 202, pp. 3263–3271, 2008. doi: 10.1016/j.surfcoat.2007.11.034
N. Lin et al., “Microstructures and wear resistance of chromium coatings on P110 steel fabricated by pack cementation”, J. Cent. South Univ. Technol., vol. 17, pp. 1155–1162, 2010. doi: 10.1007/s11771-010-0612-3
Tohru Arai and Sigeo Moriyama, “Crowth behavior of chromium carbide and niobium carbide layers on steel substrate, obtained by Salt immersion coating process”, Thin Solid Films, vol. 259, pp. 174–180, 1995. doi:10.1016/0040-6090(94)06452-0
Y. Luo et al., “Formation of titanium carbide coating with microporous structure”, Appl. Phys A, vol. 98, pp. 765–768, 2010. doi: 10.1007/s00339-009-5495-5
C. Nick, “Coatings improve tool life, increase productivity”, Manufacturing Eng., no. 96, pp. 26–31, 1986.
S. Bull et al., “Temperature mechanical properties of physical vapour deposited titanium nitride”, Surf. Eng., vol. 8, iss. 3, pp. 193–198, 1992. doi: 10.1179/sur.1992.8.3.193
N. Harchenko et al., Superdispersed Carbo Nitride Diffusion Coatings on Steel and Hard Alloys. Sumy, Ukraine: SOI PPO, 2011 (in Ukrainian).
H. Sinyarev et al., Using Computers for Thermodynamic Calculations of Metallurgical Processes. Moscow, SU: Nauka, 1982 (in Russian).
Yu. Kanyashin, “The mechanism of interaction between Cl-containing gaseous phase and cemented carbides in the chemical vapour deposition process”, Thin Solid Films, vol. 249, pp. 174–182, 1994. doi: 10.1016/0040-6090(94)90757-9
R. Andrievskiy, “Synthesis and properties of the films implementation phase”, Uspehi Himii, no. 66 (1), pp. 57–77, 1997 (in Russian).
A. Minkevich, Chemical Heat Treatment of Metals and Alloys. Moscow, Russia: Mashinostroenie, 1964 (in Russian).
I. Tanapko and S. Bogdanova, “The research phase of structural transformations in the aluminized layer of steels of different composition after heat treatment”, in Chemical Heat Treatment of Metals and Alloys. Minsk, SU: Belarusian Polytechnic Institute, 1977, pp. 51–52 (in Russian).
Yu. Geller, Tool Steel. Moscow, SU: Mashinostroenie, 1968 (in Russian).
C. Nourea et al., “Influence of carbide substrates on tribological properties of chromium and chromium-nitride coatings: applications to wood machining”, Wear, 2005, vol. 258, iss. 1-4, pp. 157–165. doi: 10.1016/j.wear.2004.09.034
A. Vereschaka and I. Tretyakov, Cutting Tools with Wear-Resistant Coatings. Moscow, SU: Mashinostroenie, 1986 (in Russian).
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