A. Ludwig

TU Bergakademie Freiberg

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Menghuai Wu

Montanuniversität Leoben

P. Trubitz

TU Bergakademie Freiberg

Gerhard Pusch

TU Bergakademie Freiberg

Florian Mayer

University of Vienna

Wilfried Eichlseder

Montanuniversität Leoben

Sebastian Henkel

TU Bergakademie Freiberg

Martin Pelzer

FEG Textiltechnik (Germany)

Josef Domitner

Graz University of Technology

Lutz Krüger

TU Bergakademie Freiberg

Hans-Peter Winkler

Berufsverband der Frauenärzte

Cooperative Institutions

Montanuniversität Leoben

TU Bergakademie Freiberg

Christian Doppler Laboratory for Thermoelectricity

John Wiley & Sons (Germany)

Institute of Metallurgy

RWTH Aachen University

Graz University of Technology

Max-Planck-Institut für Nachhaltige Materialien

VDEh-Betriebsforschungsinstitut

Jernkontoret (Sweden)

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Indirect measuring of crack growth by means of a key-curve-method in pre-cracked Charpy specimens made of nodular cast iron

International Journal of Fracture (2007)

Andreas Emrich Uwe Mühlich Meinhard Kuna A. Ludwig P. Trubitz

Charpy impact test

10.1007/s10704-007-9105-2

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Citations (6)

Cooperation within MEBSP on the Subject of Air Gap Formation During a Casting Process

Advanced Engineering Materials (2003)

J. Kron Michel Bellet A. Ludwig Joachim Wendt Björn Pustal

The goal of quantitatively predicting air gap growth in casting processes is still not reached. Subgroup IV of the international research platform MEBSP is tackling the problem with both an experimental approach (see Figure for a layout currently used at the Royal Institute of Technology) and a variety of simulation programs, being used by different participating institutes.

Air gap (plumbing)

10.1002/adem.200390012

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Citations (0)

Simulation of channel segregation using a two-phase columnar solidification model – Part I: Model description and verification

Computational Materials Science (2012)

Jun Li Menghuai Wu Jing Hao A. Ludwig

Liquidus

Ingot

Dendrite (mathematics)

Supercooling

10.1016/j.commatsci.2011.12.037

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Citations (58)

On the Impact of Macroscopic Phase Separation on Solidification Microstructures

Advanced Engineering Materials (2005)

Menghuai Wu A. Ludwig Martin Pelzer U. Postl

A term “macroscopic phase separation” is used to describe the relative motion between different phases during solidification. This paper reports three of the latest multiphase modelling results to demonstrate the role of the phase separation in solidification and the formation of the microstructure and macrosegregation.

Separation (statistics)

10.1002/adem.200500098

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Citations (10)

Analysis of macrosegregation formation and columnar-to-equiaxed transition during solidification of Al-4wt.%Cu ingot using a 5-phase model

Journal of Crystal Growth (2014)

Mahmoud Ahmadein Menghuai Wu A. Ludwig

A 5-phase mixed columnar-equiaxed solidification model was recently introduced to predict the as-cast structure, and a series of laboratory experiments were performed previously to verify the model. The focus of the current work is to analyze the formation of macrosegregation, which accompanies the formation of the as-cast structure including the columnar-to-equiaxed transition (CET). The as-cast structure and macrosegregation map of a cylindrical Al-4 wt.% Cu ingot poured at 800 °C are used as a reference to validate the calculations. Good agreement between the calculations and the experiment regarding both the macrosegregation and CET is achieved. Thermal-solutal convection and equiaxed crystal sedimentation in such ingot are verified to be key mechanisms governing the formation of macrosegregation. The competitive equiaxed/columnar growth, the soft and hard blocking mechanisms predominate the CET. The numerical study of grid sensitivity indicates that the global segregation pattern and CET are not significantly affected by grid size; however, some fine details of the segregation map which are predicted by fine grid (~0.5 mm) are smeared or locally averaged by the coarse grid (~2 mm). Such details were also not resolved in the measurement. Future investigations are demanding.

Equiaxed crystals

Ingot

10.1016/j.jcrysgro.2014.07.039

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Citations (43)

Using a Numerical Model to Study the Transient Clogging Phenomena in SEN During Continuous Casting of Steel

Hadi Barati Abdellah Kharicha A. Ludwig Menghuai Wu

Clogging

Transient (computer programming)

Transient analysis

10.33313/503/069

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Citations (0)

Determination of Fracture Mechanics Parameters for Cast Iron Materials Under Static, Dynamic and Cyclic Loading

Springer eBooks (2015)

Gerhard Pusch Sebastian Henkel Horst Biermann Peter Hübner A. Ludwig

10.1007/978-3-319-21467-2_7

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Citations (11)

A Numerical Study on the Principle of Mechanical Softreduction for Reduc- ing the Centerline Segregation in Slab Casting

Menghuai Wu Josef Domitner Florian Mayer A. Ludwig

An Eulerian two-phase columnar solidification model is used to study the principle of mechanical softre- duction (MSR) for reduction of the centerline segregation in slab casting. Interdendritic flow, the main cause of seg- regation, is calculated in the two-phase mushy region during solidification. The motion of the solidified shell and solidifying columnar dendrites in response to the mechanical deformation caused by bulging and MSR is modeled according to a modified Miyazawa-Schwerdtfeger-approach (Arch. Eisenhuttenwes, vol. 52, 1981, pp.415). A benchmark slab (9 m in length) of plain-carbon-steel is considered. Case simulations were made by varying the following parameters: the position of MSR; the reduction rate; the mechanical behavior of the MSR segment, i.e. the elongation or shortening of the MSR segment in casting direction; 'flattening' of the slab surface near the posi- tion of crater end. Further insides to the principle of the MSR are gained. With enhanced computation power the current model can be applied for a parameter study on the MSR efficiency of realistic continuous casting processes.

Slab

Flattening

Position (finance)

Source

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On the Formation of Centreline Segregation in Continuous Slab Casting of Steel due to Bulging and/or Feeding

steel research international (2010)

Florian Mayer Menghuai Wu A. Ludwig

Abstract Centreline macrosegregation is often observed in continuous slab casting of steel. Two of the main macrosegregation formation mechanisms are bulging and feeding. Both were studied and compared in the current work by using a two‐phase volume averaging model considering only columnar solidification. The casting of the strand itself is modelled by applying a predefined velocity following the casting speed and solid shell deformation (e.g. bulging). Three different cases are simulated and discussed. (i) The first case considers the influence of the feeding flow during solidification without taking bulging into account. Negative macrosegregation is observed in the centre of the casting in this case. (ii) The second case takes the flow caused by series of bulging along the solidifying strand shell into account, and is, therefore, representative for an ideal situation where bulging takes place without solidification shrinkage. In this case positive centreline segregation is found. (iii) The last case shows the results of a simulation which combines both shrinkage‐ and bulging‐induced flows. It is found that under the current casting conditions the bulging effect dominates over the shrinkage effect, and so positive centreline segregation is predicted.

Shrinkage

Slab

10.1002/srin.201000122

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Citations (56)

Evaluating of Fracture Mechanics Properties at Intermediate Strain Rates, Transferable to Components

Springer eBooks (2008)

P. Trubitz A. Ludwig Gerhard Pusch Hans-Peter Winkler

Strain (injury)

10.1007/1-4020-4972-2_254

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Citations (0)