A5058227733- Metallurgical Processes and Thermodynamics
- Microstructure and Mechanical Properties of Steels
- Metallurgy and Material Forming
- Aluminum Alloy Microstructure Properties
- Metal Alloys Wear and Properties
- Solidification and crystal growth phenomena
- Iron and Steelmaking Processes
- Materials Engineering and Processing
- Hydrogen embrittlement and corrosion behaviors in metals
- High-Temperature Coating Behaviors
- Engineering and Materials Science Studies
- Non-Destructive Testing Techniques
- Magnetic Properties and Applications
- Metal Forming Simulation Techniques
- Manufacturing Process and Optimization
- Metallurgical and Alloy Processes
- Metal Extraction and Bioleaching
- Aluminum Alloys Composites Properties
- Microstructure and mechanical properties
- Minerals Flotation and Separation Techniques
- Corrosion Behavior and Inhibition
- nanoparticles nucleation surface interactions
- Advanced Surface Polishing Techniques
- Welding Techniques and Residual Stresses
- High Temperature Alloys and Creep
Montanuniversität Leoben
2016-2025
Pohang University of Science and Technology
2023
Iron and Steel Institute of Z. I. Nekrasov National Academy of Sciences of Ukraine
2007-2017
Ferro (United States)
2014-2016
Kaiser-Franz-Josef-Spital
2012
Christian Doppler Laboratory for Thermoelectricity
2009
Government of Lower Austria
2005
FH Aachen
1997
RWTH Aachen University
1991-1993
Acicular ferrite is a microstructure nucleating intergranularly on non-metallic inclusions and forming an arrangement of fine, interlocking grains. This structure known to improve steel properties, especially toughness, essentially. The formation acicular mainly affected by composition, cooling rate, inclusion landscape austenite grain size. In recent decades, extensive research has been conducted investigate these factors. present paper provides overview the impact published results state...
Nonmetallic inclusions are well known to influence product quality and process stability in the production of steel. A step that is very sensitive presence nonmetallic inclusion (NMI) continuous casting. Here, so‐called clogging phenomenon can occur, resulting a distinct disruption casting decreased steel quality. The considerably contributes build‐up deposits submerged entry nozzle provoking instabilities flow control system. Numerous research studies have been subject different mechanisms...
The solute drag effect of phosphorus (P) in the single-phase austenite (γ-Fe) region was studied under isothermal annealing conditions at temperatures 1050°C, 1150°C, 1250°C and 1350°C. High-temperature laser scanning confocal microscopy (HT-LSCM) used to observe quantify situ grain growth on surface three different samples containing 0.026 wt.-% P, 0.044 P 0.102 P. dependence arithmetic mean sizes time temperature were modeled mathematically using a simple ordinary differential equation...
Abstract Fe‐based shape memory alloys are supposed to be an interesting and cost‐effective alternative NiTi‐based alloys. In this work, the thermo‐mechanical behavior of a novel Fe–Mn–Si–Cr–Ni–VC alloy produced using standard air‐casting facilities is characterized as well in hot forged cold rolled state. Besides certain pseudoelasticity, shows good recovery properties remarkably high stresses after heating temperatures only 160 °C, making for commercial applications that make use effect.
The dissolution of amorphous SiO 2 particles in CaO – Al O 3 slags was investigated at 1450°C by high‐temperature confocal scanning laser microscopy ( HT ‐ CSLM ) and thermodynamic/kinetic analyses. used this experimental study had a spherical form so that any rotation the particle did not cause errors determination size during dissolution. Moreover, wide composition range slag could be chosen without forming solid reaction layer which distort evaluation mechanism. evolution diameter...
High temperature confocal scanning laser microscopy (HT‐CSLM) is used to study the dissolution behavior of Al 2 O 3 inclusions in various slag compositions system CaO‐Al ‐SiO ‐MgO. This method enables situ observation at steelmaking temperatures. The change diameter spherical inclusion measured by image analysis pictures obtained from HT‐CSLM. Subsequently, rates and normalized curves are determined, governing mechanism identified use a modified approach diffusion equation introduced...
A comprehensive model was developed to simulate manganese sulfide formation during the solidification of steel. This coupled kinetics with a microsegregation linked thermodynamic databases. Classical nucleation theory and diffusion-controlled growth were applied describe process. Particle size distribution (PSD) particle-size-grouping (PSG) methods used evolution. An adjustable parameter introduced consider collisions calibrated using experimental results. With determined parameters,...
Abstract This contribution critically addresses the potential of HT-LSCM experiments for in situ observations austenite grain growth (AGG). By quantifying AGG various alloys, impact impurity induced solute drag effects (SDE) and second phase precipitation Zener pinning forces (P Z ) on can be estimated. Also boundary mobility (GBM) determined. The measured arithmetic mean time-resolved size distributions as a function temperature chemical composition is most important value quantification....
In-situ studies of the peritectic phase transition were performed under conditions close to chemical and thermal equilibrium in order investigate governing mechanism both reaction subsequent transformation using high-temperature laser-scanning microscopy combination with concentric solidification technique. Experiments have been conducted Fe–C Fe–Ni systems determine role solute diffusion on observed kinetics. The as such well can be explained by diffusion-controlled mechanisms. Observations...
A thermodynamic model coupling microsegregation and inclusion formation using one ChemSage datafile is proposed. The equilibrium calculated ChemApp to determine the liquidus temperature, solute partition coefficients at solidification interface in residual liquid. During calculations, enrichment predicted Ohnaka’s model. logarithm of tested through an overall mass balance. With proposed model, for case medium carbon steels alloyed with titanium aluminum. types compositions inclusions agree...
During the continuous casting of Ti‐stabilized ULC/IF steel grades clogging submerged entry nozzle (SEN) is frequently observed. A new statistical evaluation indicates that increasing Ti/Al‐ratios in these steels lead to an increase occurrence and its intensity. Investigations samples two TiULC heats, taken at RH‐degasser, show a remarkable inclusions due FeTi‐addition. The presence Ti‐bearing alumina particles contrary thermodynamical expectations, indicate their formation takes place as...
Continuous cooling transformation (CCT) diagrams represent roadmaps for producing all heat-treatable steels. CCT curves provide valuable information on the solid-state phase sequence, depending defined strategies, alloying concept of steel and previous processing steps. The experimental characterization is usually done a laboratory scale applying thermal analysis dilatometry. In current research studies, however, also other in-situ methods such as high-temperature laser scanning confocal...