A5032056294- Metallurgical Processes and Thermodynamics
- Microstructure and Mechanical Properties of Steels
- Metal Alloys Wear and Properties
- Aluminum Alloy Microstructure Properties
- Metallurgy and Material Forming
- Metallurgical and Alloy Processes
- Solidification and crystal growth phenomena
- Aluminum Alloys Composites Properties
- Iron and Steelmaking Processes
- High-Temperature Coating Behaviors
- Magnetic Properties and Applications
- Metal Extraction and Bioleaching
- Advanced materials and composites
- Hydrogen embrittlement and corrosion behaviors in metals
- High Temperature Alloys and Creep
- Non-Destructive Testing Techniques
- Material Properties and Applications
- Extraction and Separation Processes
- Induction Heating and Inverter Technology
- Materials Engineering and Processing
- Corrosion Behavior and Inhibition
- Composite Material Mechanics
- Intermetallics and Advanced Alloy Properties
- Advanced Materials Characterization Techniques
- Welding Techniques and Residual Stresses
Montanuniversität Leoben
2015-2025
Pohang University of Science and Technology
2023
Iron and Steel Institute of Z. I. Nekrasov National Academy of Sciences of Ukraine
2007-2017
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....
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...
The usage of low-grade ferrous scrap has increased over decades to decrease CO2 emissions and produce steel products at a low cost. A serious problem in melting post-consumer material is the accumulation tramp elements, e.g., Cu Sn, liquid steel. These elements are difficult remove during conventional steelmaking processes. Sn considered as one most harmful because, together with Cu, it sometimes induces metal embrittlement high-temperature processing, continuous casting hot rolling....
Abstract During the solidification of steel, phosphorus strongly segregates in interdendritic liquid phase. In continuous casting process, even low levels P may have a detrimental effect on final product quality. However, is partly added up to 0.10 wt pct improve mechanical properties advanced steel grades nowadays, e.g., High-Strength Interstitial-Free (HSIF). To provide new experimental data for development thermodynamic databases and models alloyed grades, phase equilibria Fe-P Fe-C-P key...
In the course of decarbonization steel production, electric production will continue to gain importance. The processing low‐quality scrap also play an important role, which may lead increase in content so‐called tramp elements and further processing. This article examines effect Cu, Sn, Ni on formation surface cracks under conditions continuous casting process. Results situ bending test are compared with results experimental simulation high‐temperature oxidation thermodynamic analysis based...
Abstract Nowadays the production of steel from scrap in electric arc furnaces is most common bridging technology to reduce CO 2 emissions. Depending on quality, a non-negligible content tramp elements such as Cu, Sn, or Ni introduced into steel. As their affinity oxygen lower than that iron, they typically enrich at steel/scale interface area and along grain boundaries during oxidation, which may result quality problems. Oxidation processes are unavoidable solid processing, therefore, deeper...
The pinning forces of niobium carbonitrides (Nb(C,N)) on grain boundary (GB) migration in austenite (γ‐Fe) are studied under isothermal annealing conditions at temperatures 950, 1050, 1150, and 1250 °C. High‐temperature laser scanning confocal microscopy enables situ observations quantification the size evolution 12 Fe–Nb–C–N alloys, each containing 0.15 wt% C, with Nb content ranging from 0 up to 0.08 N 60 120 ppm. quantified mean sizes further applied for parametrization Nb‐induced solute...
Solid-state phase transformations in the γ-loop of binary Fe-P system were studied using differential scanning calorimetry (DSC) and high-temperature laser confocal microscopy (HT-LSCM). In total, eight alloys with varying P content from 0.026 to 0.48 mass pct. investigated temperature range 800 °C 1450 °C. The first part present work deals critical evaluation approach couple DSC experiments HT-LSCM observations order characterize bcc/fcc equilibria Fe-based γ-loops. transformation...
High-temperature oxidation phenomena play a crucial role in steel production and processing. The development of new alloying concepts, the modification routes due to decarbonization steelmaking, increasing quality demands will additionally stimulate research activities on high-temperature oxidation. Within scope this publication, behavior an unalloyed was investigated by means thermogravimetric (TG) metallographic analysis. TG measurements were performed with simultaneous thermal analyzer...
The phase transformation sequence during the solidification of carbon steels strongly influences their behavior in casting process. Therefore, most exact knowledge dependence characteristics on steel composition is highest relevance for process and quality optimization. influence alloying elements like C, Mn or Si well understood as far content rather low. New grades, high-alloyed TRIP- TWIP-steels contain almost up to 10 wt.-% Al 30 wt.-%Mn. present work focuses first results parallel...
Abstract Analytical liquidus equations were evaluated using differential scanning calorimetry (DSC) and thermal analysis (DTA). Results of 180 measurements in the Fe-C-Si-Mn-Al-P subsystems considered, where experimental methodology was demonstrated for four alloys Fe-Si-Mn-Al system. Excellent agreement between DSC/DTA dataset most recently published equation found (error 2.1 ± 1.6 °C). For this equation, suggested modifications phosphorus parameters will help to improve calculations...
High-temperature oxidation phenomena play an important role in steel processing. What is mostly underrated the importance of internal casting processes, namely continuous process. To investigate impact intergranular on surface defect formation, experiments for two cooling strategies and time sequences a conventional slab caster were conducted. As influence silicon high-temperature well known its effect ductility marginal was chosen as alloying element to provoke oxidation. The methods used...
Oxidation processes are unavoidable in continuous casting and further hot processing of steel. A deeper understanding the occurring phenomena such as intergranular oxidation liquid metal infiltration grain boundaries is essential to continuously improve quality products. In this study, experiments were performed with simultaneous thermal analysis for two thin slab rolling applications under near-process conditions up point prior first reduction stage. The low-carbon steels contaminated...
Different alloying concepts to trace deoxidation products, mainly aluminium oxides, using rare earth elements (REEs), were tested on the laboratory scale by melting trials with a high-frequency remelting furnace. Lanthanum and Cerium, which belong group of light REEs, used for these experiments. The formed multiphase inclusions characterized scanning electron microscopy energy dispersive spectroscopy. Concerning higher atomic numbers traced non-metallic (NMIs) seem brighter than steel matrix...
Based on recently published research leaching control mechanisms in electric arc furnace (EAF) slags, it is assumed that a FeO/SiO2 ratio of around one leads to low leached V and Cr concentrations. This influences the mineral phase composition slag toward higher amounts spinel lower solubility calcium silicate phases by suppressing formation magnesiowuestite highly soluble phases. To evaluate this hypothesis, laboratory scaled up tests an EAF pilot plant were performed samples characterized...
Reliable thermodynamic data are essential information required for the design of new steel types and a prerequisite to effective process optimization simulation. Moreover, it is important know exact temperatures at which high-temperature phase transformations (TLiquid, TSolid, TPerit, Tγ→δ) occur in order describe solidification sequence further processing parameters. By utilizing DTA/DSC measurements, our earlier experimental studies selected commercial DP, TRIP high-Mn TWIP steels, have...