Актуальные проблемы в машиностроении. 2016. №3

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Актуальные проблемы в машиностроении. 2016. №3 Материаловедение
в машиностроении
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491
SURFACE SATURATION OF LOW-CARBON STEEL WITH BORON
AND ALUMINUM FROM PASTES IN THERMOCYCLING
Polyansky I. P. 1, Engineer, e-mail:
Sizov I. G. 1, (Engineering), Professor, e-mail:
Mishigdorzhiyn U. L. 1, Ph.D, Senior Researcher, e-mail:
Leyens C. 2, (Engineering), Professor, e-mail:
Vetter B. 2, (Engineering), Principal engineer, e-mail:
1 East Siberia State University of Technology and Management, 40V Kluchevskaya st., Ulan-Ude,
670013, Russian Federation
2 Technische Universität Dresden, 10 Helmholtzstraße, Dresden, 01069, Germany
Abstract
Isothermal and thermocycle boroaluminizing of the steel 20 is carried out, the thermocycling
temperature range of the coated samples is determined, the comparative analysis of microstructures
according to the treatment mode is given, the distribution of microhardness and the elemental
composition of the diffusion layer depth are studied, oxidation of the boroaluminized layers on the
steel 20 is investigated.
It is found that the combination of chemical and thermocycle treatments contributes to a better
formation of the boroaluminized layer, particularly, it produces a more aluminum enriched phase in
the diffusion layer, such as FeAl3 and Fe2Al5, which in turn leads to an increase in microhardness
and oxidizing environment resistance at high temperatures. Also it is established that thermocycle
treatment brings to the structure refinement of a saturable material, which has a positive effect on
mechanical properties of the substrate.
Keywords
thermochemical treatment, paste boroaluminizing, thermocycling, microhardness, electron
microprobe analysis, oxidation resistance
Funding
The work was supported by the Russian President's grant for state support of young Russian
scientists - PhD (Competition - MK-2015)