Tytuł pozycji:
The influence of laser boronizing parameters on the mechanism of formation and properties of surface layers produced on iron alloys with various carbon content
This paper analyses the boronizing treatment which was performed by means of CO2 molecular laser with a power of 2600 W. Boron was introduced by remelting the paste with a thickness of 40÷120 mm, containing amorphous boron or iron-boron, use the material of the substrate, such as Armco iron or C45 and C90 types of steel. The influence of the boron paste thickness, variable P power from P = 0.78 kW to 1.82 kW, with the constant laser beam scanning velocity v = 2.88 m/min and material type on the mechanism of formation, microstructure, microhardness and frictional wear resistance of the formed layers (surface structure). After laser boronizing the surface layer consists of zone-structured tracks: melted zone, heat affected zone and the substrate. The melted zone contains boride-martensitic eutectic, in C45 and C90 types of steel there under the remelted zone there is a heat affected zone which is composed of a martensitic structure. With the increase in the laser power, width and depth of laser tracks increases in all the iron alloys with variable thickness of the applied amorphous boron paste. With the increase in the thickness of the boron paste, width of the laser tracks increases and depth of the laser tracks decreases with the constant beam power. The maximum dimensions of the remelted zone for C45 steel were: approx. 600 μm (width) and 350 μm (depth). The highest average microhardness of the surface layer reaches approx. 1500 HV0.1 and it decreases with the increase in power for all the iron alloys. Microhardness and frictional wear resistance of the layer boronized by means of laser with the use of the paste containing iron-boron is lower than that of the layer boronized with the use of the paste containing only boron.
W pracy przeanalizowano mechanizm procesu borowania z użyciem lasera molekularnego TRUMPF TLF 2600 Turbo CO2. Bor wprowadzano przez przetopienie laserem pasty zawierającej bor z materiałem podłoża w postaci żelaza Armco oraz stali C45 i C90. Badania miały na celu określenie wpływu zawartości węgla w stopie żelaza oraz parametrów obróbki (moc lasera, prędkość posuwu wiązki, rodzaj i grubość warstwy pasty borującej) na mikrostrukturę, mikrotwardość oraz odporność na zużycie przez tarcie wytworzonej warstwy wierzchniej.
Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę (zadania 2017).
