| Autor: |
Chabak, Yu. G., Efremenko, V. G., Fedun, V. I., Petryshynets, I., Pastukhova, T. V., Efremenko, B. V., Kromka, F., Tsvetkova, E. V. |
| Předmět: |
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| Zdroj: |
Journal of Nano- & Electronic Physics; 2021, Vol. 13 Issue 2, p02030-1-02030-7, 7p |
| Abstrakt: |
The object of this work is to study the microstructure and wear behavior of grey cast iron superficially modified by pulsed-plasma deposition of the coating and subsequent laser beam melting. The coating 50 vol. % WC + 50 vol. % Al-bronze of 85-135 m width was deposited employing an electrothermal axial plasma accelerator with ten pulses under the discharge voltage of 4 kV. The coated surface was subsequently melted by infrared fiber laser TruFiber 400 (TRUMPF) with a beam wavelength of 1064 nm (beam spot was 0.5 mm, scanning velocity was 0.5 mm·s–1, power was 400 W). The investigations included scanning electron microscopy observation (JSM-6510 JEOL), energy-dispersive X-ray spectroscopy (JED-2300, JEOL), tribological testing (tribometer Micron-tribo) and microhardness measurement (FM-300, Future-Tech Corp.) under the load of 0.05 kg. After the deposition/laser melting to a depth of up to 600 μm, the surface was modified from ferrite/lamellar graphite structure to Ledeburite-like eutectic/ε-copper precipitates structure. The carbide eutectic consisted of fine pearlitic dendrites embedded into a cementite matrix. The structural gradient from fully remelted zone to transitional (carbide/graphite) zone and further to heat-affected zones (with pearlite and ferrite/pearlite matrix structure) was revealed in the cross-section to reach 1250 μm in total width. The microhardness of the remelted zone was measured as 900-1000 HV50 to be 5 times higher than that of unmodified structure. The double surface treatment increased the scratch wear resistance of a modified grey cast iron by 15 times as compared to the ferrite/graphite substrate. The effect of copper and tungsten on laser-induced structure formation in grey cast iron is discussed. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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