J. Rudnizki
RWTH Aachen University
Modular designPinning forceBasis (linear algebra)Zener pinningBearing (mechanical)Ferrite (iron)Work (thermodynamics)Case hardeningDeformation (engineering)Composite materialGrain boundary diffusion coefficientMartensitePhase boundaryInformation exchangeField (physics)MetallurgyGrain sizeMaterials scienceStructural materialSystems engineeringCondensed matter physicsAbnormal grain growthMicroalloyed steelScientific methodProduction (economics)Test (assessment)CarburizingCost reductionSand castingDual-phase steelQuality (business)Materials processingHeat treatedResidual stressComputer scienceBainitePhase (matter)Grain boundaryProduct (business)Component (UML)CarbonAutomotive industryProcess designPearliteNucleationAnnealing (metallurgy)Mechanical engineeringFormabilityCrystallographyPrecipitation (chemistry)Grain boundary strengtheningMicrostructureDissolutionAusteniteGrain growth
9Publications
6H-index
148Citations
Publications 10
Newest
#1Tarek Allam (RWTH Aachen University)H-Index: 4
#2Wolfgang Bleck (RWTH Aachen University)H-Index: 54
Last. J. RudnizkiH-Index: 6
view all 0 authors...
Abstract null null The continuous casting behavior of medium manganese steels (MMnS: 6Mn, 6Mn–1Si, 6Mn–1Si–1Al, 10Mn–1Si and 10Mn–1Si–1Al) have been investigated and compared with unalloyed carbon steel C30. A series of in-situ melting/re-solidification hot tensile tests were conducted in the temperature range 800–1450 °C. The corresponding tensile forces and ductility parameters were monitored. Differential thermal analysis (DTA) was applied to determine the liquidus temperatures. The solidifie...
1 CitationsSource
#1J. Rudnizki (RWTH Aachen University)H-Index: 6
#2Ulrich Prahl (RWTH Aachen University)H-Index: 30
Last. Wolfgang Bleck (RWTH Aachen University)H-Index: 54
view all 3 authors...
Cold-rolled dual-phase steels, which belong to the advanced high strength steels, have gained much interest within the automotive industry. The formation of dual-phase microstructure, which provides an optimal combination of strength and formability for automotive applications, occurs during intercritical annealing of cold-rolled strip. Variations in the chemical composition as well as in the heat treatment parameters influence very strongly the microstructure development and therefore the final...
8 CitationsSource
#1Stephan Freyberger (RWTH Aachen University)H-Index: 2
#2Stefan Benke (Cologne University of Applied Sciences)H-Index: 5
Last. J. Rudnizki (RWTH Aachen University)H-Index: 6
view all 4 authors...
Source
#1Georg J. Schmitz (RWTH Aachen University)H-Index: 15
#2Stefan Benke (RWTH Aachen University)H-Index: 5
Last. Urs Eppelt (Fraunhofer Society)H-Index: 4
view all 15 authors...
This article outlines on-going activities at the RWTH Aachen University aiming at a standardized, modular, extendable and open simulation platform for materials processing. This platform on the one hand facilitates the information exchange between different simulation tools and thus strongly reduces the effort to design/re-design production processes. On the other hand, tracking of simulation results along the entire production chain provides new insights into mechanisms, which cannot be explain...
12 CitationsSource
#1J. Rudnizki (RWTH Aachen University)H-Index: 6
#2B. Böttger (RWTH Aachen University)H-Index: 1
Last. Wolfgang Bleck (RWTH Aachen University)H-Index: 54
view all 4 authors...
The prediction of microstructure and, consequently, of mechanical properties, as a function of chemical composition and heat treatment parameters, is currently a major topic of scientific investigations. There has been considerable effort to investigate the phase transformation during cooling and its modeling. In comparison, the metallurgical processes of the ferrite-austenite transformation during heating and annealing have not been intensively studied. However, the austenite formation during h...
41 CitationsSource
#1J. Rudnizki (RWTH Aachen University)H-Index: 6
#2B. Zeislmair (RWTH Aachen University)H-Index: 2
Last. Wolfgang Bleck (RWTH Aachen University)H-Index: 54
view all 4 authors...
As carburisation is a time-consuming process, it might seem advisable to shorten the process by increasing the carburising temperature. Although there is an economic advantage to high-temperature carburisation, this process is not widespread because of the problem of abnormal grain growth. Conventional case-hardening steels show heavy grain coarsening at temperatures higher than 1000 °C. To counter this problem, microalloying elements such as Nb and Ti are commonly added to resist austenite grai...
30 CitationsSource
#1J. Rudnizki (RWTH Aachen University)H-Index: 6
#2B. Zeislmair (RWTH Aachen University)H-Index: 2
Last. Wolfgang Bleck (RWTH Aachen University)H-Index: 54
view all 4 authors...
Modern material and process design aim at cost reduction and property improvement simultaneously. As for carburized engineering components the carburisation is a time consuming process, the idea is to shorten the carburising time by increasing the carburising temperature. To avoid any deterioration in steel properties, the ambition is to hinder austenite grain growth by microalloying case hardening steels. Until now, the results revealed in the literature mainly rely on experimental investigatio...
11 CitationsSource
#1Piyada Suwanpinij (RWTH Aachen University)H-Index: 8
#2J. Rudnizki (RWTH Aachen University)H-Index: 6
Last. Wolfgang Bleck (RWTH Aachen University)H-Index: 54
view all 4 authors...
Dual phase steels, consisting of hard martensite particles in a ductile ferritic matrix, offer high strength and deformability at the same time. Additionally, they are cost effective by a dilute alloying concept. In industrial production, two manufacturing concepts have been implemented: intercritical annealing of cold rolled sheet, or hot rolling. The current work has investigated the effect of deformation on the γ-α phase transformation kinetics in the dual phase steel production using the hot...
8 CitationsSource
#1Markus Apel (RWTH Aachen University)H-Index: 19
#2B. Böttger (RWTH Aachen University)H-Index: 12
Last. Ingo Steinbach (RUB: Ruhr University Bochum)H-Index: 38
view all 5 authors...
In this paper, the effect of particle pinning on grain boundary motion is investigated by phase-field modeling. In general, the kinetics of grain growth in multicrystalline materials is determined by the interplay of curvature driven grain boundary motion and the balance of interfacial tension at the vertices of a grain boundary network. A comprehensive way to treat both effects in one model is given by the phase-field approach. The specific feature of the multiphase-field model used for this in...
40 CitationsSource
#1J. RudnizkiH-Index: 6
#2B. ZeislmairH-Index: 2
Last. Wolfgang BleckH-Index: 54
view all 4 authors...
Kurzfassung Ein Weg zur kostengunstigen Produktion von einsatzgeharteten Bauteilen mit geeigneten mechanischen Eigenschaften ist die Modifizierung des Aufkohlens durch die Verkurzung der Prozessdauer. Seit Langerem wird versucht, die Aufkohlungsdauer durch Erhohung der Aufkohlungstemperatur zu verkurzen, ohne dass die Veranderungen der Prozessparameter die Qualitat des Bauteils negativ beeinflussen. Die klassischen Einsatzstahle sind jedoch nur fur das Einsatzharten unter 950°C geeignet, da bei ...
1 CitationsSource