TY  - JOUR
AU  - Filipovic, Mirjana
AU  - Kamberović, Željko
AU  - Korać, Marija
AU  - Anđić, Zoran
PY  - 2014
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/1784
AB  - The influence of mass fractions 1.5 % Nb and 1.5 % V, added singly and in combination, on the microstructural characteristics and properties relevant to the service performance of the hypoeutectic high-chromium white iron containing 18 % Cr and 2.9 % C, namely, the wear resistance and the fracture toughness, has been examined. The Fe-Cr-C-Nb-V alloy gives the best compromise between the wear resistance and the fracture toughness. The dynamic fracture toughness of this alloy is larger by about 42 % and the abrasion wear resistance is larger by about 33 % than the properties of the basic Fe-Cr-C alloy. The presence of NbC carbides in the structure, caused by adding niobium to the alloy, contributes to an improvement of the wear resistance and the dynamic fracture toughness. On the other hand, the higher fracture toughness was attributed to the strengthening during fracture, since very fine secondary carbide particles were present, mainly in the austenitic matrix (as a result of the vanadium addition). The secondary carbides that precipitate in the matrix regions also influence the abrasion behaviour. By increasing the matrix strength through a dispersion-hardening effect, the fine secondary carbides can increase the mechanical support of M7C3 eutectic carbides.
PB  - Inst Za Kovinske Materiale I In Tehnologie, Ljubjana
T2  - Materials and Technology = Materiali in Tehnologije
T1  - Wear Resistance and Dynamic Fracture Toughness of Hypoeutectic High-Chromium White Cast Iron Alloyed with Niobium and Vanadium
VL  - 48
IS  - 3
SP  - 343
EP  - 348
UR  - https://hdl.handle.net/21.15107/rcub_cherry_1784
ER  - 

@article{
author = "Filipovic, Mirjana and Kamberović, Željko and Korać, Marija and Anđić, Zoran",
year = "2014",
abstract = "The influence of mass fractions 1.5 % Nb and 1.5 % V, added singly and in combination, on the microstructural characteristics and properties relevant to the service performance of the hypoeutectic high-chromium white iron containing 18 % Cr and 2.9 % C, namely, the wear resistance and the fracture toughness, has been examined. The Fe-Cr-C-Nb-V alloy gives the best compromise between the wear resistance and the fracture toughness. The dynamic fracture toughness of this alloy is larger by about 42 % and the abrasion wear resistance is larger by about 33 % than the properties of the basic Fe-Cr-C alloy. The presence of NbC carbides in the structure, caused by adding niobium to the alloy, contributes to an improvement of the wear resistance and the dynamic fracture toughness. On the other hand, the higher fracture toughness was attributed to the strengthening during fracture, since very fine secondary carbide particles were present, mainly in the austenitic matrix (as a result of the vanadium addition). The secondary carbides that precipitate in the matrix regions also influence the abrasion behaviour. By increasing the matrix strength through a dispersion-hardening effect, the fine secondary carbides can increase the mechanical support of M7C3 eutectic carbides.",
publisher = "Inst Za Kovinske Materiale I In Tehnologie, Ljubjana",
journal = "Materials and Technology = Materiali in Tehnologije",
title = "Wear Resistance and Dynamic Fracture Toughness of Hypoeutectic High-Chromium White Cast Iron Alloyed with Niobium and Vanadium",
volume = "48",
number = "3",
pages = "343-348",
url = "https://hdl.handle.net/21.15107/rcub_cherry_1784"
}

Filipovic, M., Kamberović, Ž., Korać, M.,& Anđić, Z.. (2014). Wear Resistance and Dynamic Fracture Toughness of Hypoeutectic High-Chromium White Cast Iron Alloyed with Niobium and Vanadium. in Materials and Technology = Materiali in Tehnologije
Inst Za Kovinske Materiale I In Tehnologie, Ljubjana., 48(3), 343-348.
https://hdl.handle.net/21.15107/rcub_cherry_1784

Filipovic M, Kamberović Ž, Korać M, Anđić Z. Wear Resistance and Dynamic Fracture Toughness of Hypoeutectic High-Chromium White Cast Iron Alloyed with Niobium and Vanadium. in Materials and Technology = Materiali in Tehnologije. 2014;48(3):343-348.
https://hdl.handle.net/21.15107/rcub_cherry_1784 .

Filipovic, Mirjana, Kamberović, Željko, Korać, Marija, Anđić, Zoran, "Wear Resistance and Dynamic Fracture Toughness of Hypoeutectic High-Chromium White Cast Iron Alloyed with Niobium and Vanadium" in Materials and Technology = Materiali in Tehnologije, 48, no. 3 (2014):343-348,
https://hdl.handle.net/21.15107/rcub_cherry_1784 .

TY  - JOUR
AU  - Kamberović, Željko
AU  - Raic, Karlo
AU  - Filipovic, Mirjana
AU  - Anđić, Zoran
AU  - Korać, Marija
PY  - 2011
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/1205
AB  - Presented study shows the analysis of the process of reduction of WO(3) powder with hydrogen in the vertical tube reactor, representing a new approach in comparison to the conventional methods in the horizontal tube reactor. SEM analysis of the synthetisized tungsten powder shows the existence of particles, approximately 1 mu m in size, both individual ones and those within the porous agglomerates with a spongy structure. In order to study the mechanism and kinetics of the reduction process, the reduction degree and retention time of particles of WO(3) powder in the reaction zone were calculated using a developed mathematical model, based on the application of Stokes' law. Kinetic parameters and activation energies were determined at the corresponding temperature intervals. Kinetic analysis showed that the process of WO(3) reduction with hydrogen in the vertical tube reactor in the temperature interval from 700 to 900 degrees C occurs in the kinetic zone. Activation energy for the temperature interval from 700 to 800 degrees C is E(a1)=7.5+/-0.1kJ/mol, whereas for the temperature interval from 800 to 900 degrees C, activation energy is E(a2)=14.6+/-0.1 kJ/ma A model was proposed describing the mechanism of the reduction process in the vertical tube reactor according to which particles of tungsten powder 1 mu m in size arise from the stretching and cracking of coarse particles in the reduction zone, as well as from the appropriate temperature shock outside this zone.
PB  - Editura Stiintifica Fmr, Bucharest
T2  - Metalurgia International
T1  - The Mechanism and Kinetics of the Tungsten (Vi)-Oxide Reduction in the Vertical Tube Reactor
VL  - 16
IS  - 12
SP  - 52
EP  - 57
UR  - https://hdl.handle.net/21.15107/rcub_cherry_1205
ER  - 

@article{
author = "Kamberović, Željko and Raic, Karlo and Filipovic, Mirjana and Anđić, Zoran and Korać, Marija",
year = "2011",
abstract = "Presented study shows the analysis of the process of reduction of WO(3) powder with hydrogen in the vertical tube reactor, representing a new approach in comparison to the conventional methods in the horizontal tube reactor. SEM analysis of the synthetisized tungsten powder shows the existence of particles, approximately 1 mu m in size, both individual ones and those within the porous agglomerates with a spongy structure. In order to study the mechanism and kinetics of the reduction process, the reduction degree and retention time of particles of WO(3) powder in the reaction zone were calculated using a developed mathematical model, based on the application of Stokes' law. Kinetic parameters and activation energies were determined at the corresponding temperature intervals. Kinetic analysis showed that the process of WO(3) reduction with hydrogen in the vertical tube reactor in the temperature interval from 700 to 900 degrees C occurs in the kinetic zone. Activation energy for the temperature interval from 700 to 800 degrees C is E(a1)=7.5+/-0.1kJ/mol, whereas for the temperature interval from 800 to 900 degrees C, activation energy is E(a2)=14.6+/-0.1 kJ/ma A model was proposed describing the mechanism of the reduction process in the vertical tube reactor according to which particles of tungsten powder 1 mu m in size arise from the stretching and cracking of coarse particles in the reduction zone, as well as from the appropriate temperature shock outside this zone.",
publisher = "Editura Stiintifica Fmr, Bucharest",
journal = "Metalurgia International",
title = "The Mechanism and Kinetics of the Tungsten (Vi)-Oxide Reduction in the Vertical Tube Reactor",
volume = "16",
number = "12",
pages = "52-57",
url = "https://hdl.handle.net/21.15107/rcub_cherry_1205"
}

Kamberović, Ž., Raic, K., Filipovic, M., Anđić, Z.,& Korać, M.. (2011). The Mechanism and Kinetics of the Tungsten (Vi)-Oxide Reduction in the Vertical Tube Reactor. in Metalurgia International
Editura Stiintifica Fmr, Bucharest., 16(12), 52-57.
https://hdl.handle.net/21.15107/rcub_cherry_1205

Kamberović Ž, Raic K, Filipovic M, Anđić Z, Korać M. The Mechanism and Kinetics of the Tungsten (Vi)-Oxide Reduction in the Vertical Tube Reactor. in Metalurgia International. 2011;16(12):52-57.
https://hdl.handle.net/21.15107/rcub_cherry_1205 .

Kamberović, Željko, Raic, Karlo, Filipovic, Mirjana, Anđić, Zoran, Korać, Marija, "The Mechanism and Kinetics of the Tungsten (Vi)-Oxide Reduction in the Vertical Tube Reactor" in Metalurgia International, 16, no. 12 (2011):52-57,
https://hdl.handle.net/21.15107/rcub_cherry_1205 .