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Modification of the Structure and Properties of FeSiB Amorphous Ribbon by Interference Pulsed Laser Heating

Czyż O., Kusiński J., Radziszewska A., Ostrowski R., Morgiel J., Kanak J., Kąc M.

Archives of Metallurgy and Materials

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2018

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Vol. 63, iss. 4

2001--2007

EN

Paper describes the results of Fe80Si11B9 amorphous ribbon investigation after pulsed laser interference heating and conventional annealing. As a result of interference heating periodically placed laser heated microareas were obtained. Structure characterisation by scanning and transmission electron microscopy showed in case of laser heated samples presence of crystalline nanostructure in amorphous matrix. Microscopy observations showed significant difference in material structure after laser heating – nanograin structure, and material after annealing – dendritic structure. Magnetic force microscopy investigation showed expanded magnetic structure in laser heated microareas, while amorphous matrix did not give magnetic signal. Change of magnetic properties was examined by magnetic hysteresis loop measurement, which showed that the laser heating did not have a significant influence on soft magnetic properties.

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Crystallization of FeSiB Amorphous Ribbons Induced by Laser Interference Irradiation

Kusinski J., Czyż O., Radziszewska A., Morgiel J., Ostrowski R., Strzelec M., Czyż K., Rycyk A.

Archives of Foundry Engineering

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2018

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Vol. 18, iss. 2

27--30

EN

Detailed studies on the effects of pulsed laser interference heating on surface characteristics and subsurface microstructure of amorphous Fe80Si11B9 alloy are reported. Laser interference heating, with relatively low pulsed laser energy (90 and 120 mJ), but with a variable number (from 50-500) of consecutive laser pulses permitted to get energy accumulation in heated areas. Such treatment allowed to form two- Dimensional micro-islands of laser-affected material periodically distributed in amorphous matrix. The crystallization process of amorphous FeSiB ribbons was studied by means of scanning and transmission electron microscopy. Detailed microstructural examination showed that the use of laser beam, resulted in development of nanostructure in the heated areas of the amorphous ribbon. The generation of nanocrystalline seed islands created by pulsed laser interference was observed. This key result may evidently give new knowledge concerning the differences in microstructure formed during the conventional and lased induced crystallization the amorphous alloys. Further experiments are needed to clarify the effect of pulsed laser interference crystallization on magnetic properties of these alloys.

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Mikrostruktura i własności złączy ze stali 7CrMoVTiB10-10 uzyskanych w procesie spawania laserowego

Czyż O., Radziszewska A.

Przegląd Spawalnictwa

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2017

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R. 89, nr 12

5--9

PL

Celem pracy była analiza struktury, zmian składu chemicznego oraz twardości złączy jednoimiennych ze stali 7CrMoVTiB10-10 uzyskanych w wyniku spawania wiązką lasera CO2, poddanych obróbce cieplnej – wyżarzaniu w temperaturze 755°C przez 0,5 h, 1 h oraz 2 h. Badania mikroskopowe przeprowadzono za pomocą: mikroskopii świetlnej i elektronowej skaningowej. Materiał badawczy poddano jakościowej i ilościowej analizie składu chemicznego stosując technikę EDS, której celem było określenie rozkładu poszczególnych pierwiastków w złączu i w ujawnionych wydzieleniach. Ponadto określono zmiany twardości na przekroju złączy. Badania wykazały uzyskanie złączy o jednorodnym składzie chemicznym. Wykazano występowanie w złączach wydzieleń bogatych w tytan, mangan, wanad. Twardość w spoinie wynosiła ok. 400 HV1, a w SWC ok. 360 HV1. Zastosowanie obróbki cieplnej spowodowało spadek twardości spoiny do ok. 270 HV1.

EN

The paper presents results of the microstructure investigation, changes of chemical composition and hardness of the 7CrMoVTiB10-10 steel joints and their analyzes after heat treatment at 755°C for 0.5 h, 1 h, 2 h. The joints were performed with a CO2 laser. Microstructural research where carried out using light and scanning electron microscopy. The energy dispersive spectroscopy was applied to specify distribution of chemical elements in the welded joints and revealed precipitates. Moreover the hardness tests were determined in order to define change of hardness at the cross-section of the joints. Investigation shown homogenous chemical composition in the welds. In the joints the precipitates rich in Ti, Mn, and V were revealed. Hardness of the weld amounted 400 HV1, but of HAZ - 360 HV1. Heat treatment led to decreasing of the hardness of laser joints to about 270 HV1 .