Jozef Janovec | Slovak University of Technology (original) (raw)

Papers by Jozef Janovec

Research paper thumbnail of Changes in Corrosion Resistance of 18%Cr-12%Ni-Type Stainless Steels After Sensitization

Research paper thumbnail of Influence of long-term isothermal exposures upon M7C3 carbide changes in 2.7Cr-0.6Mo-0.3V steel

Scripta Metallurgica Et Materialia, Apr 1, 1992

Research paper thumbnail of Influence of Phosphorus Grain Boundary Segregation on Fracture Behaviour of Iron-Base Alloys

Materials Science Forum, Dec 1, 2007

Chemical and structural changes at the grain boundaries were investigated to quantify their influ... more Chemical and structural changes at the grain boundaries were investigated to quantify their influence on fracture behaviour of austenitic stainless steels and model ferritic Fe-Si-P alloys. The balance between the size and the area density of intergranular particles was found to be one of the most decisive factors influencing sensitivity of the steels to intergranular fracture. The precise dependence of the energy of intergranular fracture on the phosphorus grain boundary concentration was also determined.

Research paper thumbnail of Role Of M<SUB>23</SUB>C<SUB>6</SUB> Carbide Precipitation and Phosphorus Grain Boundary Segregation in Intergranular Fracture and Corrosion of 18Cr-12Ni Austenitic Stainless Steel

Canadian Metallurgical Quarterly, Sep 1, 2002

ABSTRACT The effects of intergranular precipitation (size of precipitates) and phosphorus grain b... more ABSTRACT The effects of intergranular precipitation (size of precipitates) and phosphorus grain boundary segregation on fracture and corrosion behaviours of the 18Cr-12Ni steel were investigated. In the investigation, techniques of light microscopy, SEM, TEM, AES, EDX, electron diffraction, and the Huey test were used. A good correlation was found between the average size of intergranular particles and the portion of intergranular fracture for samples impact loaded at 173 K. The equilibrium values of phosphorus grain boundary concentration showed the close correlation with the values of weight loss (penetration depth) measured during the Huey test. French On a étudié les effets de la précipitation intergranulaire (taille des précipités) et de la ségrégation du phosphore aux joints de grain sur le comportement de fracture et de corrosion de l&#39;acier 18Cr-12Ni. Dans cette investigation, on a utilisé des techniques variées incluant microscopie optique, SEM, TEM, AES, EDX, diffraction électronique et test de Huey. On a trouvé une bonne corrélation entre la taille moyenne des particules intergranulaires et la portion de fracture intergranulaire d&#39;échantillons chargés par choc à 173 K. Les valeurs d&#39;équilibres de la concentration de phosphore aux joints de grain ont montré une corrélation étroite avec les valeurs de perte de poids (profondeur de pénétration) mesurées lors du test de Huey.

Research paper thumbnail of Contribution to Al-Pd-Co system: Structural studies of epsilon phase and proposal of partial isothermal section at 1035 °C

Journal of Alloys and Compounds, Mar 1, 2022

Research paper thumbnail of Evolution of Phases in Selected Al–Co–Cu Complex Metallic Alloys Under Near-Equilibrium Conditions at 800–1150 ∘C

Research paper thumbnail of Microstructural and mechanical aspects of tempered ICCGHAZ of SQV-2A low alloy steel weld

Research paper thumbnail of Partial Experimental Isothermal Section of Al-Pd-Co Phase Diagram for Al-Rich Corner at 1020 °C

Journal of Phase Equilibria and Diffusion, Oct 19, 2018

Research paper thumbnail of Isothermal Section of the Al-Pd-Co Phase Diagram at 850 °C Delimited by Homogeneity Ranges of Phases Epsilon, U, and F

Journal of Phase Equilibria and Diffusion, Apr 18, 2016

Research paper thumbnail of A Partial Isothermal Section at 1000 °C of Al-Mn-Fe Phase Diagram in Vicinity of Taylor Phase and Decagonal Quasicrystal

Journal of Phase Equilibria and Diffusion, Dec 14, 2015

Altogether 19 alloys of an Al-Mn-Fe system with compositions near to the Taylor phase and/or the ... more Altogether 19 alloys of an Al-Mn-Fe system with compositions near to the Taylor phase and/or the decagonal quasicrystal were characterised by the x-ray diffraction and the energy-dispersive x-ray spectroscopy coupled with the scanning electron microscopy, after annealing at 1000 °C for 330 h. The obtained experimental results were used to propose a partial isothermal section at 1000 °C of the Al-Mn-Fe phase diagram. The ternary T-phase area of an untypical saddle shape was found to touch the Al-Mn binary one. The γ2-phase was found to be stable between 2 and 30 at.% of Fe at 1000 °C and boundaries between γ1- and γ2-areas are expected to be located very close to the Al-Mn binary.

Research paper thumbnail of Electrochemical corrosion of Al-Pd alloys in HCl and NaOH solutions

Journal of Mining and Metallurgy, Section B, 2017

Research paper thumbnail of Corrosion behavior of Zn-Mg and Zn-Mg-Y alloys

AIP Conference Proceedings

Research paper thumbnail of Microstructure, Phase Occurrence, and Corrosion Behavior of As-Solidified and As-Annealed Al-Pd Alloys

Journal of Materials Engineering and Performance, 2018

Research paper thumbnail of Artificial neural network models for prediction of daily fine particulate matter concentrations in Algiers

Environmental Science and Pollution Research, 2016

Neural network (NN) models were evaluated for the prediction of suspended particulates with aerod... more Neural network (NN) models were evaluated for the prediction of suspended particulates with aerodynamic diameter less than 10-μm (PM10) concentrations. The model evaluation work considered the sequential hourly concentration time series of PM10, which were measured at El Hamma station in Algiers. Artificial neural network models were developed using a combination of meteorological and time-scale as input variables. The results were rather satisfactory, with values of the coefficient of correlation (R2) for independent test sets ranging between 0.60 and 0.85 and values of the index of agreement (IA) between 0.87 and 0.96. In addition, the root mean square error (RMSE), the mean absolute error (MAE), the normalized mean squared error (NMSE), the absolute relative percentage error (ARPE), the fractional bias (FB), and the fractional variance (FS) were calculated to assess the performance of the model. It was seen that the overall performance of model 3 was better than models 1 and 2.

Research paper thumbnail of Austenite in the process of thermomechanical treatment of microalloyed spring steels

Research paper thumbnail of Evolution of phases in Al55Ni30Pd15 alloy at temperatures up to 600 °C

Research paper thumbnail of Characterization of phases in complex metallic alloys Al73Mn27−Fe (x= 2, 4 and 6)

Intermetallics, 2009

The characterization of phases in Al73Mn27−xFex (x=2, 4 and 6) alloys was performed using X-ray d... more The characterization of phases in Al73Mn27−xFex (x=2, 4 and 6) alloys was performed using X-ray diffraction, differential thermal analysis, and scanning electron microscopy enabling energy dispersive X-ray spectroscopy. Both the annealed and the thermally cycled states were studied. In the annealed states the occurrence of T-phase was expected, however it was confirmed for alloys Al73Mn25Fe2 and Al73Mn23Fe4 only. The annealing

Research paper thumbnail of Evolution of phases in Al–Pd–Co alloys

Research paper thumbnail of AC Loss in Pancake Coil Made From 12 mm Wide REBCO Tape

IEEE Transactions on Applied Superconductivity, 2013

Research paper thumbnail of Splitting of AISI 316 Austenitic Stainless Steel

Canadian Metallurgical Quarterly, 2001

... In terms of Watanabe's concept of grain boundary engineering [13,14], if an austenitic st... more ... In terms of Watanabe's concept of grain boundary engineering [13,14], if an austenitic steel contains predominantly spe-cial, low energy boundaries, the kinetics of M23C6 precipi-tation is slower and the probability of splitting appearance in tensile testing is lower. ...

Research paper thumbnail of Changes in Corrosion Resistance of 18%Cr-12%Ni-Type Stainless Steels After Sensitization

Research paper thumbnail of Influence of long-term isothermal exposures upon M7C3 carbide changes in 2.7Cr-0.6Mo-0.3V steel

Scripta Metallurgica Et Materialia, Apr 1, 1992

Research paper thumbnail of Influence of Phosphorus Grain Boundary Segregation on Fracture Behaviour of Iron-Base Alloys

Materials Science Forum, Dec 1, 2007

Chemical and structural changes at the grain boundaries were investigated to quantify their influ... more Chemical and structural changes at the grain boundaries were investigated to quantify their influence on fracture behaviour of austenitic stainless steels and model ferritic Fe-Si-P alloys. The balance between the size and the area density of intergranular particles was found to be one of the most decisive factors influencing sensitivity of the steels to intergranular fracture. The precise dependence of the energy of intergranular fracture on the phosphorus grain boundary concentration was also determined.

Research paper thumbnail of Role Of M<SUB>23</SUB>C<SUB>6</SUB> Carbide Precipitation and Phosphorus Grain Boundary Segregation in Intergranular Fracture and Corrosion of 18Cr-12Ni Austenitic Stainless Steel

Canadian Metallurgical Quarterly, Sep 1, 2002

ABSTRACT The effects of intergranular precipitation (size of precipitates) and phosphorus grain b... more ABSTRACT The effects of intergranular precipitation (size of precipitates) and phosphorus grain boundary segregation on fracture and corrosion behaviours of the 18Cr-12Ni steel were investigated. In the investigation, techniques of light microscopy, SEM, TEM, AES, EDX, electron diffraction, and the Huey test were used. A good correlation was found between the average size of intergranular particles and the portion of intergranular fracture for samples impact loaded at 173 K. The equilibrium values of phosphorus grain boundary concentration showed the close correlation with the values of weight loss (penetration depth) measured during the Huey test. French On a étudié les effets de la précipitation intergranulaire (taille des précipités) et de la ségrégation du phosphore aux joints de grain sur le comportement de fracture et de corrosion de l&#39;acier 18Cr-12Ni. Dans cette investigation, on a utilisé des techniques variées incluant microscopie optique, SEM, TEM, AES, EDX, diffraction électronique et test de Huey. On a trouvé une bonne corrélation entre la taille moyenne des particules intergranulaires et la portion de fracture intergranulaire d&#39;échantillons chargés par choc à 173 K. Les valeurs d&#39;équilibres de la concentration de phosphore aux joints de grain ont montré une corrélation étroite avec les valeurs de perte de poids (profondeur de pénétration) mesurées lors du test de Huey.

Research paper thumbnail of Contribution to Al-Pd-Co system: Structural studies of epsilon phase and proposal of partial isothermal section at 1035 °C

Journal of Alloys and Compounds, Mar 1, 2022

Research paper thumbnail of Evolution of Phases in Selected Al–Co–Cu Complex Metallic Alloys Under Near-Equilibrium Conditions at 800–1150 ∘C

Research paper thumbnail of Microstructural and mechanical aspects of tempered ICCGHAZ of SQV-2A low alloy steel weld

Research paper thumbnail of Partial Experimental Isothermal Section of Al-Pd-Co Phase Diagram for Al-Rich Corner at 1020 °C

Journal of Phase Equilibria and Diffusion, Oct 19, 2018

Research paper thumbnail of Isothermal Section of the Al-Pd-Co Phase Diagram at 850 °C Delimited by Homogeneity Ranges of Phases Epsilon, U, and F

Journal of Phase Equilibria and Diffusion, Apr 18, 2016

Research paper thumbnail of A Partial Isothermal Section at 1000 °C of Al-Mn-Fe Phase Diagram in Vicinity of Taylor Phase and Decagonal Quasicrystal

Journal of Phase Equilibria and Diffusion, Dec 14, 2015

Altogether 19 alloys of an Al-Mn-Fe system with compositions near to the Taylor phase and/or the ... more Altogether 19 alloys of an Al-Mn-Fe system with compositions near to the Taylor phase and/or the decagonal quasicrystal were characterised by the x-ray diffraction and the energy-dispersive x-ray spectroscopy coupled with the scanning electron microscopy, after annealing at 1000 °C for 330 h. The obtained experimental results were used to propose a partial isothermal section at 1000 °C of the Al-Mn-Fe phase diagram. The ternary T-phase area of an untypical saddle shape was found to touch the Al-Mn binary one. The γ2-phase was found to be stable between 2 and 30 at.% of Fe at 1000 °C and boundaries between γ1- and γ2-areas are expected to be located very close to the Al-Mn binary.

Research paper thumbnail of Electrochemical corrosion of Al-Pd alloys in HCl and NaOH solutions

Journal of Mining and Metallurgy, Section B, 2017

Research paper thumbnail of Corrosion behavior of Zn-Mg and Zn-Mg-Y alloys

AIP Conference Proceedings

Research paper thumbnail of Microstructure, Phase Occurrence, and Corrosion Behavior of As-Solidified and As-Annealed Al-Pd Alloys

Journal of Materials Engineering and Performance, 2018

Research paper thumbnail of Artificial neural network models for prediction of daily fine particulate matter concentrations in Algiers

Environmental Science and Pollution Research, 2016

Neural network (NN) models were evaluated for the prediction of suspended particulates with aerod... more Neural network (NN) models were evaluated for the prediction of suspended particulates with aerodynamic diameter less than 10-μm (PM10) concentrations. The model evaluation work considered the sequential hourly concentration time series of PM10, which were measured at El Hamma station in Algiers. Artificial neural network models were developed using a combination of meteorological and time-scale as input variables. The results were rather satisfactory, with values of the coefficient of correlation (R2) for independent test sets ranging between 0.60 and 0.85 and values of the index of agreement (IA) between 0.87 and 0.96. In addition, the root mean square error (RMSE), the mean absolute error (MAE), the normalized mean squared error (NMSE), the absolute relative percentage error (ARPE), the fractional bias (FB), and the fractional variance (FS) were calculated to assess the performance of the model. It was seen that the overall performance of model 3 was better than models 1 and 2.

Research paper thumbnail of Austenite in the process of thermomechanical treatment of microalloyed spring steels

Research paper thumbnail of Evolution of phases in Al55Ni30Pd15 alloy at temperatures up to 600 °C

Research paper thumbnail of Characterization of phases in complex metallic alloys Al73Mn27−Fe (x= 2, 4 and 6)

Intermetallics, 2009

The characterization of phases in Al73Mn27−xFex (x=2, 4 and 6) alloys was performed using X-ray d... more The characterization of phases in Al73Mn27−xFex (x=2, 4 and 6) alloys was performed using X-ray diffraction, differential thermal analysis, and scanning electron microscopy enabling energy dispersive X-ray spectroscopy. Both the annealed and the thermally cycled states were studied. In the annealed states the occurrence of T-phase was expected, however it was confirmed for alloys Al73Mn25Fe2 and Al73Mn23Fe4 only. The annealing

Research paper thumbnail of Evolution of phases in Al–Pd–Co alloys

Research paper thumbnail of AC Loss in Pancake Coil Made From 12 mm Wide REBCO Tape

IEEE Transactions on Applied Superconductivity, 2013

Research paper thumbnail of Splitting of AISI 316 Austenitic Stainless Steel

Canadian Metallurgical Quarterly, 2001

... In terms of Watanabe's concept of grain boundary engineering [13,14], if an austenitic st... more ... In terms of Watanabe's concept of grain boundary engineering [13,14], if an austenitic steel contains predominantly spe-cial, low energy boundaries, the kinetics of M23C6 precipi-tation is slower and the probability of splitting appearance in tensile testing is lower. ...