S. Longauer

Technical University of Košice

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Margita Longauerová

Technical University of Košice

Marek Vojtko

Slovak Academy of Sciences

G. Janák

Technical University of Košice

Jana Konrádyová

Technical University of Košice

Pavel Bekeč

Podbrezová Iron Works (Slovakia)

МА

М. А. Федорова

Omsk State Technical University

Mária Huráková

Institute of Experimental Physics of the Slovak Academy of Sciences

G. Gritzner

Johannes Kepler University of Linz

MŠ

Martin Šebek

Technical University of Denmark

W. König

Voestalpine (Austria)

Cooperative Institutions

Technical University of Košice

Slovak Academy of Sciences

Institute of Experimental Physics of the Slovak Academy of Sciences

Institute of Materials Research of the Slovak Academy of Sciences

University of Pavol Jozef Šafárik

Johannes Kepler University of Linz

X-Fab (Germany)

Czech Academy of Sciences, Institute of Physics

VSB - Technical University of Ostrava

Munich University of Applied Sciences

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Stabilization of martensite in α/β microstructure of a Cu-Zn-AI shape-memory alloy

Journal de Physique IV (Proceedings) (2003)

S. Longauer Marek Vojtko G. Janák Margita Longauerová

Stacking-fault energy

Diffusionless transformation

Stacking fault

10.1051/jp4:2003939

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Citations (3)

INFLUENCE OF CASTING RATE ON PRECIPITATION OF PARTICLES BASED ON MICRO-ALLOYING ELEMENTS IN SLAB SURFACE ZONE

Margita Longauerová Pavel Bekeč М. А. Федорова S. Longauer

The aim of this paper was to evaluate the dependenc e of precipitation on casting rate in the surface zone of a TiNb microalloyed steel slab, and to compare the results with those in a TiNb IF steel slab. In the microalloyed steel TEM reveal ed fine and larger globular particles and larger angular particles of TiN and TiC. For higher castin g rates TEM revealed more fine particles of similar shape, but NbC was combined with TiN and TiC. Precipitates in the slab surface zone of the TiNb IF steel were both globular and oval. They were based on Al and Ti in combination with MnS and stick shape particles based on Al. Comparison of precipitates in the surface zone of slabs cast at the same pulling rate 0.8m/min for both TiNb micro-alloyed steel and TiNb IF steel grades, showed fewer particles in the IF stee l. This is assumed to be due to the very low carbon content in the IF steel compared to the micr oalloyed one.

Slab

Microalloyed steel

Carbon fibers

Source

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Citations (1)

Precipitation in Surface Zone of Continuously-Cast Slab of ULC/IF Steel Microalloyed with Titanium

Materials science forum (2014)

Margita Longauerová Mária Huráková S. Longauer

The aim of this work was to analyze the morphology and distribution of the microalloy precipitates in the slab surface zone of ULC/IF steel microalloyed with titanium. The slab was made by continuous casting using two different slab pulling rates. Transient slabs were pulled with pulling rate 0.4 m/min at the start and 0.8 m/min at the end of the slab. It was confirmed that morphology of the particles evaluated in the surface areas of slab were globular, cubical or elliptical shape and have been identified as of TiS, TiN and TiC. At the lower drawing rate particles from the middle cut-out from an area with coarse ferritic grains at the slab surface attained an mean size of 2r = 41.8 nm, and from an area with fine ferritic grains they attained an mean size of 2r = 32.5 nm. At the higher drawing rate particles in the middle cut-out attained an mean size of 2r= 63.5 nm. The coarser particles were found in areas with coarse ferrite grains and at higher pulling speed.

Slab

Microalloyed steel

10.4028/www.scientific.net/msf.782.73

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Citations (4)

INFLUENCE OF COOLING RATE ON TiNb MICROALLOYED STEEL SLAB SURFACE ZONE FRACTURE MORPHOLOGY

Acta Metallurgica Slovaca - Conference (2013)

Margita Longauerová Pavel Bekeč Marek Vojtko S. Longauer Pavol Marek

The aim of this work was to analyze the influence of technology on the morphology of fractures and Charpy impact toughness in the TiNb microalloyed steel slab surface zone. The slab was made by continuous casting using different cooling rates in the secondary cooling zone (2 cooling rates were selected for testing) and 2 slab pulling rates 0.5 m/min and 0.8 m/min. It turned out that, with a higher slab pulling rate for both cooling rates applied, the impact toughness was generally lower than that with the slow pulling rate. Microstructure analyses showed the composition of the surface zone was formed by ferrite and pearlite. Coarser ferrite was seen in the surface zone with the higher slab pulling rate and higher cooling rate in the secondary cooling zone. The surface zone microstructure was polyedric for the lower cooling rate and sporadically nonpolyedric with needle-like, or acicular ferrite for faster cooling. Brittle fracture test pieces showed fracture surfaces with transcrystalline cleavage facets (TCF) regardless of the applied cooling rate. With lower cooling rates, smooth facets of intercrystalline decohesion (FID) were identified too, but at less than 0.1%. With faster cooling they showed up in a few isolated cases only. The occurrence of dimpled transcrystalline ductile fractures (DTDF) was generally low. It was confirmed that the morphology of forced fractures was influenced by the cooling rate via the produced microstructure. The embrittlement of the tested samples was assisted by clusters and single particles. They were identified using EDX as based on Al, or combined with Ti, Nb nitrides, or carbide and sulphide eutectics, or inclusions ordered in rows in the ferrite network. Since the occurrence of intercrystalline fractures was low with faster cooling and high slab pulling rate, distinctive suppression of segregation can be assumed for this technology, if compared to slow cooling and low slab pulling rate.

Morphology

Slab

Microalloyed steel

10.12776/amsc.v3i0.103

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Citations (3)

Microstructure and Superconducting Characteristics of HgmPbnBa2Ca2Cu3O8+δ

Springer eBooks (1997)

I. Sargánková W. König M. Mair G. Gritzner J. Kováč

Ampoule

10.1007/978-94-011-5732-2_14

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Citations (0)

Hot Ductility of TiNb IF Steel Slab after Hot Torsion Testing

Metals (2019)

Jana Konrádyová Margita Longauerová Petr Jonšta Petr Jonšta S. Longauer

The aim of the work was to evaluate the hot ductility loss in TiNb stabilized IF steel directly from the continuously-cast slab using hot torsion testing (plastometry) in the temperature range 600–1250 °C according to the basic programme, and also after temperature cycling. A good match of the temperature dependences of number of turns to failure (Nf) and intensity of deformation Se was confirmed. In both cases, the existence of three temperature areas with decrease in plasticity to a minimum was confirmed. The two-stage temperature cycling according to the CT1150 and CT900 programmes mostly resulted in a decrease in plasticity compared to the basic programme. The most significant effect of cycling was related to the CT900 programme below the maximum plasticity in the base programme at 850 °C. A less pronounced decrease was observed for CT1150 cycling below the maximum plasticity in the base program at 1050 °C. In the case of CT1150 cycling, more complex particles were observed at the fractures compared with the basic programme, namely carbonitrides of Ti and Nb in combination with oxisulfides respectively, then Ti nitrides with oxisulfides or oxides and, in addition, complex (Fe,Nb)P4, (Ti,Nb)3S4 type particles. Their mean size determined statistically using TEM was much finer, only 20 nm versus 42 nm in the basic programme. Similarly, CT900 cycling revealed finer particles with an average size of 37 nm compared to 105 nm in the basic programme. The observed particles were Al oxides, Ti(N,C) and (Ti,Nb)2S, in contrast to the particles probably of TiFe and FeMnS in the basic programme. The decrease in plasticity corresponded to the finer particles, newly created in the temperature cycling.

Ductility (Earth science)

Cycling

Atmospheric temperature range

Temperature cycling

10.3390/met9070752

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Citations (2)

Iron nanoparticles produced by precipitation phenomena in solid state

Materials Letters (2009)

Ondrej Milkovič G. Janák Štefan Nižník S. Longauer L. Fröhlich

Ferrihydrite

Supersaturation

10.1016/j.matlet.2009.10.025

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Citations (9)

Shape Memory Effect in CuZnAl Alloys Quenched from Alfa + Beta Phase Zone

Journal de Physique IV (Proceedings) (1995)

S. Longauer I. Bochnák G. Janák P. Makroczy Margita Longauerová

Volume fraction

BETA (programming language)

Fraction (chemistry)

10.1051/jp4/199558847

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Citations (1)

Precipitation and Recrystallization in Austenite of Nb-V Microalloyed Steel

Materials science forum (1993)

Margita Longauerová S. Longauer Rudolf Mišičko

Recrystallization (geology)

Microalloyed steel

10.4028/www.scientific.net/msf.113-115.485

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Citations (1)

Microstructure Evolution and Mechanical Properties of C-Mn Cold Rolled Dual Phase Steel after Continuous Annealing Process in Laboratory Conditions

Archives of Metallurgy and Materials (2014)

Martin Šebek Peter Horňák Peter Zimovčák S. Longauer

Abstract The article deals with the influence of annealing parameters on evolution of microstructure and mechanical properties of dual phase steel. Dual phase steel was annealed in laboratory conditions according to the three chosen cycles of annealing: into intercritical region (780°C), into austenite region (920°C) and into austenite region (920°C) by subsequently cooling into intercritical region (780°C) with the hold at the temperature of 495°C. Simulation of annealing regimes by thermo-mechanical simulator Gleeble was done. The obtained microstructure consists from three phases: ferritic matrix, martensite and martensite/ bainite grains. For the microstructure identification the TEM and nanoindentation experiments were performed.

Dual-phase steel

10.2478/amm-2014-0140

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Citations (4)