Browsing by Subject "eutectic"

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Access status: Open Access ,
Estimation of the cooling rate in 3 mm suction-cast rods based on the microstructural features
(2013) Kozieł, Tomasz; Matusiewicz, Piotr; Kopyściański, Mateusz; Zielińska-Lipiec, Anna
One of the factors influencing possibility of bulk metallic glass formation is cooling rate attainable in the casting process. The evaluation of the cooling rate of the suction-cast 3 mm rods is presented based on the measurements of the cellular spacing in the Fe-25Ni and lamellar spacing in the Cu-33Al alloys. The estimated cooling rates are higher close to the rod surface (2952-3817 $K\cdot s^{-1}$) than in the rod axis (228-328 $K\cdot s^{-1}$), which indicates the dominant radial heat flow. In contrast, for the Al-33Cu alloy higher cooling rates were evaluated in the rod axis than close to the surface due to the concave perturbation of the solidification front during eutectic transformation. Based on the results obtained for the Fe-25Ni alloy, it is concluded, that the cooling rate for the suction-cast 3 mm rod is not lower than 228 $K\cdot s^{-1}$.
Access status: Open Access ,
Forming of the microstructure in Fe-C-V alloys
(2011) Kawalec, Magdalena; Fraś, Edward
The study presents the results of microstructural examinations of the volume solidifying Fe-C-V alloys containing carbon in the range of 1.45-2.23% and vanadium in the range of 7.33-15.08%. Attention was focussed on near-eutectic alloys. The Fe-C-V eutectic crystallising in these alloys is composed of ferrite and vanadium carbides of VC1-x type, and as such is included in the group of fibrous eutectics. During research, the experimental eutectic lines were plotted for Fe-C-V alloys, and a formula enabling calculation of the eutectic saturation ratio of these alloys was proposed.