Запис Детальніше

Structure and wear resistance of aluminium alloys coated with surface layer laser-modified by silicon carbide

Електронний науковий архів Науково-технічної бібліотеки Національного університету "Львівська політехніка"

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Title Structure and wear resistance of aluminium alloys coated with surface layer laser-modified by silicon carbide
 
Creator Student, Mykhaylo
Pokhmurska, Hanna
Zadorozhna, Khrystyna
Dzyubyk, Andrii
Khomych, Ivan
 
Contributor Karpenko Physico-Mechanical institute of the NAS of Ukraine
Lviv Polytechnic National University
 
Subject surface characteristics
aluminium alloy
composite layer
radiation zone
diffusion
inhomogeneity
wear resistance
friction
laser reinforcement
 
Description Modern approaches to ensuring the necessary characteristics of surface of a
material with the aim to improve economic and technological characteristics of the structures are
considered in this paper. It is shown that aluminium alloys gain wide application in industry.
Nevertheless, surface characteristics of materials are insufficiently good for their use in structures
which operate under abrasive wearing and boundary friction.
The use of the method of surface modification by a concentrated light-beam of energy is of
prospect. Analysis of literature data indicates that in the course of laser-modification of surface of an
aluminium alloy it is possible to form a material whose operational characteristics are higher than
those of the material in its initial state. However, herewith it is important to quantitively estimate
properties of the obtained composite layer on the surface of the article as well as to estimate the
distinction between the layer and the main metal.
The microstructure of laser-modified composite layers of aluminium alloys which had been
formed by means of direct blow-in of SiC powder into the melted by laser radiation zone of surface
has been investigated.
Laser reinforcement of surfaces of aluminium alloys by SiC particles causes pronounced
inhomogeneity of structure of surface layers of alloys. It has been shown that preliminary heating of
specimens in the course of their laser-treatment increases the depth of the modified layer over the
whole zone of treatment and improves the uniformity of distribution of reinforcing SiC particles;
however, because of turbulence in the melt there is observed some non-uniformity of distribution of
SiC particles in the modified layer.
It is found that in the interaction of Al melt with SiC particles there forms plates of Al4C3
carbide at the interface, these plates grow mainly co-axially to the orientations of SiC crystals in the
direction to the melt. Besides, in the matrix there takes place partial dissolution of SiC with
formation of needle-shaped Al4C3 carbides.
During the modification of surfaces of these alloys, in the case of increased concentration of
silicium in the melt there is also observed inclusion of pure silicium. Besides, there is also possible
the diffusion of aluminium into thin near-surface layer of silicium carbide, the layer separates from
SiC crystal (phenomenon of ply separation) when the concentration of aluminium reaches a value of
3–5 %. It is established that the abrasive wear resistance of the non-modified AD35 alloy, which is
determined according to the method of rigid abrasive wheel, is by 30–45 % higher than that of B95
alloy. In this case, the deterioration (wear-and-tear) proceeds according to the following two
mechanisms: (1) by cutting and (2) by adhesive grafting between the abrasive wheel and the
aluminium alloy by tearing out alloy particles from the surface.
Optimal regimes of laser reinforcement of surfaces of aluminium alloy by means of fine SiC
particles have been determined in this paper; this enabled us to increase 40–70 times the wear
resistance of aluminium alloys in comparison with non-modified alloys when they are subjected to
friction by rigidly fixed abrasive particles. The same reinforcement almost two times increases the
wear resistance in dry reversive friction, and it increases the wear resistance only by 10–25 % in
wearing by loose abrasive particles.
 
Date 2019-02-11T13:44:19Z
2019-02-11T13:44:19Z
2018-01-29
2018-01-29
 
Type Article
 
Identifier Structure and wear resistance of aluminium alloys coated with surface layer laser-modified by silicon carbide / Mykhaylo Student, Hanna Pokhmurska, Khrystyna Zadorozhna, Andrii Dzyubyk, Ivan Khomych // Ukrainian Journal of Mechanical Engineering and Materials Science. — Lviv : Lviv Politechnic Publishing House, 2018. — Vol 4. — No 1. — P. 49–57.
http://ena.lp.edu.ua:8080/handle/ntb/44125
Structure and wear resistance of aluminium alloys coated with surface layer laser-modified by silicon carbide / Mykhaylo Student, Hanna Pokhmurska, Khrystyna Zadorozhna, Andrii Dzyubyk, Ivan Khomych // Ukrainian Journal of Mechanical Engineering and Materials Science. — Lviv : Lviv Politechnic Publishing House, 2018. — Vol 4. — No 1. — P. 49–57.
 
Language en
 
Relation Ukrainian Journal of Mechanical Engineering and Materials Science, 1 (4), 2018
[1] V. M. Korzh, et al., Nanesennia pokryttia [Coating]. Kyiv, Ukraine: Aristei Publ., 2005. [In Ukrainian].
[2] K. A. Yushchenko, et al., Inzheneriia poverkhni [Surface engineering]. Kyiv, Ukraine: Naukova Dumka Publ., 2007. [In Ukrainian].
[3] H. Pokhmurska, M. Student, and V. Pokhmurskyi, Hazotermichni pokryttia [Gas-thermal coatings]. Lviv, Ukraine: Prostir-M Publ., 2017. [In Ukrainian].
[4] T. Hoenig, et al., “Verfahrensentwicklung zum Laserdispergieren von Si-Hartstoffen in Aluminiumlegirungen zum partiellen Verschleisschutz” [“Process development for the laser dispersion of Si-hard materials in aluminum alloys for partial wear protection”], Schriftenreihe Werkstoffe und werkstofftechnische Anwendungen, vol. 022, pp. 91–96, 2005. [in German].
[5] A. A. Vedenov, and G. G. Gladush, Fizicheskie protsessy pri lazernoi obrabotke materialov [Physical processes in laser processing of materials]. Moscow, Russia: Energoatomizdat Publ., 1985. [in Russian].
[6] V. P. Veiko, and M. N. Libenson, Lazernaia obrabotka [Laser processing]. Leningrad, Russia: Lenizdat Publ., 1973. [in Russian].
[7] K.-J. Mattes, and E. Seliga, Schweβen und Schneiden mit Lasern, Professur Schweβtechnik, TU Chemnitz [Welding and cutting with lasers, Professorship of welding technology, TU Chemnitz]. 1998. [in German].
[8] M. M. Khrushchov, and M. A. Babichev, Abrazivnoe iznashivanie [Abrasion wear]. Moscow, Russia: Nauka Publ., 1970. [in Russian].
[9] Obespechenie iznosostoikosti izdelii Metod ispytaniia materialov na iznosostoikost pri trenii o nezhestko zakreplennye abrazivnye chastitsy [Provision of wear resistance of products. Method for testing materials for abrasion resistance in the presence of friction abrasive particles], GOST 23.208-79, 1979. [in Russian].
[10] Kh. R. Zadorozhna, et al., “Znosostiikist lazerno modyfikovanykh karbidom kremniiu poverkhnevykh shariv aliuminiievykh splaviv” [“Abrasion resistance of laser-modified silicon carbide surface layers of aluminum alloys”], in Proceedings of 11th Scientific and Practical Conference of students, postgraduates and young scientists “Improving the reliability of machinery and equipment”, Kropyvnytskyi, Ukraine, April 20–21, 2017, pp. 40–43. [in Ukrainian].
[1] V. M. Korzh, et al., Nanesennia pokryttia [Coating]. Kyiv, Ukraine: Aristei Publ., 2005. [In Ukrainian].
[2] K. A. Yushchenko, et al., Inzheneriia poverkhni [Surface engineering]. Kyiv, Ukraine: Naukova Dumka Publ., 2007. [In Ukrainian].
[3] H. Pokhmurska, M. Student, and V. Pokhmurskyi, Hazotermichni pokryttia [Gas-thermal coatings]. Lviv, Ukraine: Prostir-M Publ., 2017. [In Ukrainian].
[4] T. Hoenig, et al., "Verfahrensentwicklung zum Laserdispergieren von Si-Hartstoffen in Aluminiumlegirungen zum partiellen Verschleisschutz" ["Process development for the laser dispersion of Si-hard materials in aluminum alloys for partial wear protection"], Schriftenreihe Werkstoffe und werkstofftechnische Anwendungen, vol. 022, pp. 91–96, 2005. [in German].
[5] A. A. Vedenov, and G. G. Gladush, Fizicheskie protsessy pri lazernoi obrabotke materialov [Physical processes in laser processing of materials]. Moscow, Russia: Energoatomizdat Publ., 1985. [in Russian].
[6] V. P. Veiko, and M. N. Libenson, Lazernaia obrabotka [Laser processing]. Leningrad, Russia: Lenizdat Publ., 1973. [in Russian].
[7] K.-J. Mattes, and E. Seliga, Schweben und Schneiden mit Lasern, Professur Schwebtechnik, TU Chemnitz [Welding and cutting with lasers, Professorship of welding technology, TU Chemnitz]. 1998. [in German].
[8] M. M. Khrushchov, and M. A. Babichev, Abrazivnoe iznashivanie [Abrasion wear]. Moscow, Russia: Nauka Publ., 1970. [in Russian].
[9] Obespechenie iznosostoikosti izdelii Metod ispytaniia materialov na iznosostoikost pri trenii o nezhestko zakreplennye abrazivnye chastitsy [Provision of wear resistance of products. Method for testing materials for abrasion resistance in the presence of friction abrasive particles], GOST 23.208-79, 1979. [in Russian].
[10] Kh. R. Zadorozhna, et al., "Znosostiikist lazerno modyfikovanykh karbidom kremniiu poverkhnevykh shariv aliuminiievykh splaviv" ["Abrasion resistance of laser-modified silicon carbide surface layers of aluminum alloys"], in Proceedings of 11th Scientific and Practical Conference of students, postgraduates and young scientists "Improving the reliability of machinery and equipment", Kropyvnytskyi, Ukraine, April 20–21, 2017, pp. 40–43. [in Ukrainian].
 
Rights © Національний університет „Львівська політехніка“, 2018
© Student M., Pokhmurska H., Zadorozhna K., Dzyubyk A., Khomych I., 2018
 
Format 49-57
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application/pdf
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Coverage Lviv
 
Publisher Lviv Politechnic Publishing House