DSpace Repository :: Browsing by Author "Sobula, Sebastian"

Article

Open Access

An evaluation of combustion kinetics for the synthesis reaction of the reinforcing phase during casting

(AGH University of Science and Technology Press, 2020) Wiktor, Tomasz; Sobula, Sebastian; Burbelko, Andriy A.; Ptasznik, Michał

The computer modeling of the solidification process in castings with local composite reinforcement (LCR) obtained as a result of in situ reactions of self-propagating high temperature synthesis (SHS) is difficult due to limited data on the thermo-physical parameters of exothermic effects and the kinetics of the synthesis reaction. In the present study, Hadfield cast steel casting was manufactured with LCR containing titanium carbide particles obtained in situ by the SHS method. Reaction kinetics of titanium carbide synthesis in the composite casting were determined on the basis of temperature measurements in the area of LCR during the process. For the estimation of the reaction, the Fourier Thermal Analysis method was used. The paper presents the results of temperature measurement and the results of the calculation of SHS reaction kinetics. It was found that the reaction time under the conditions of the analyzed casting is below 3 s.

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Analiza mikrostruktury w obrębie spoiny po spawaniu staliwa 22Cr5Mn2Ni2MoN

(Data obrony: 2016-01-25) Majka, Damian Mariusz
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Analiza właściwości tribologicznych wybranych materiałów przeznaczonych do pracy w kontakcie z żywnością

(Data obrony: 2016-07-15) Sałaciak, Grzegorz Tomasz
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Analiza zjawiska fragmentacji warstw kompozytowych wzmacnianych TiC, otrzymywanych in situ w odlewach na bazie wybranych stopów Fe-C

(Data obrony: 2021-02-02) Marosz, Jan
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Charakterystyka mikrostruktury stref kompozytowych wytworzonych w staliwie L20HGSNM

(Data obrony: 2017-02-02) Matoga, Przemysław Łukasz
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Charakterystyka procesu wytapiania stali w elektrycznym piecu łukowym.

(Data obrony: 2019-02-01) Miłoś, Cezary
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Charakterystyka składników struktury staliwa zawierającego $18-25\%Cr$ oraz $4-9\%Ni$

(Data obrony: 2014-02-04) Wawrzyczek, Dawid Edward
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Charakterystyka staliwa GX12CrMoVNbN9-1

(Data obrony: 2013-02-07) Kopyto, Karol Dawid
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Dobór obróbki cieplnej wyrobów spawanych ze stali H18

(Data obrony: 2014-02-04) Czapla, Mateusz Grzegorz
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Article

Open Access

Inoculation-induced change in carbides content in the columnar and equiaxed structure of centrifugally cast tubes from 32Ni-25Cr-Nb steel

(2011) Tęcza, Grzegorz; Sobula, Sebastian

The properties of alloys used for centrifugally cast catalytic tubes depend on the stability of carbides hardening the alloy at an operating temperature. Tubes cast in centrifugal process are characterised by structure changing on the cross-section: the outer layer is composed of columnar crystals, while inner layer has the structure of equiaxed crystals. The properties of these two zones differ and have a major influence on the casting behaviour during operation. The aim of this study was to determine the volume fraction of Cr and Nb carbides in the zone of columnar and equiaxed crystals under different inoculation regimes. It was found that the type of the used microadditives changes the amount of carbides in the investigated zones of castings.