Niels Skat Tiedje

Niels Skat Tiedje

Associate Professor

DTU MECHANICAL ENGINEERING
Department of Mechanical Engineering

Section of Manufacturing Engineering

Technical University of Denmark

Produktionstorvet

Building 425, room 223

2800 Kgs. Lyngby

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2019
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Geometric Form of Gating System Elements and Its Influence on the Initial Filling Phase

Dojka, Rafal ; Jezierski, Jan ; Tiedje, Niels Skat
in: Journal of Materials Engineering and Performance

Type: Journal article (Peer reviewed)

Status: Accepted/In press     |    Year: 2019     |    DOI: https://doi.org/10.1007/s11665-019-03973-9

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Keyhole-induced porosities in Laser-based Powder Bed Fusion (L-PBF) of Ti6Al4V: High-fidelity modelling and experimental validation

Bayat, Mohamad ; Thanki, Aditi ; Mohanty, Sankhya ; Witvrouw, Ann ; Yang, Shoufeng ; Thorborg, Jesper ; Skat Tiedje, Niels ; Hattel, Jesper Henri
in: Additive Manufacturing

Type: Journal article (Peer reviewed)

Status: Accepted/In press     |    Year: 2019     |    DOI: https://doi.org/10.1016/j.addma.2019.100835

 

Microstructure and residual elastic strain at graphite nodules in ductile cast iron analyzed by synchrotron X-ray microdiffraction

Zhang, Y. B. ; Andriollo, T. ; Fæster, S. ; Barabash, R. ; Xu, R. ; Tiedje, N. ; Thorborg, J. ; Hattel, J. ; Juul Jensen, D. ; Hansen, N.
in: Acta Materialia, vol: 167, pages: 221-230

Type: Journal article (Peer reviewed)

Status: Published     |    Year: 2019     |    DOI: https://doi.org/10.1016/j.actamat.2019.01.038

2018
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A graphite nodule growth model validated by in situ synchrotron x-ray tomography

Bjerre, M. K. ; Azeem, M. A. ; Tiedje, N. S. ; Thorborg, J. ; Lee, P. D. ; Hattel, J. H.
in: Modelling and Simulation in Materials Science and Engineering, vol: 26, issue: 8, pages: 085012

Type: Journal article (Peer reviewed)

Status: Published     |    Year: 2018     |    DOI: https://doi.org/10.1088/1361-651X/aae9ce

 

Analysis of Local Conditions on Graphite Growth and Shape During Solidification of Ductile Cast Iron

Tiedje, Niels S. ; Bjerre, Mathias K. ; Azeem, Mohammed A. ; Hattel, Jesper H. ; Lee, Peter D.
in: Transactions of the Indian Institute of Metals, vol: 71, issue: 11, pages: 2699-2705

Type: Journal article (Peer reviewed)

Status: Published     |    Year: 2018     |    DOI: https://doi.org/10.1007/s12666-018-1448-z

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Residual Stresses around Individual Graphite Nodules in Ductile Iron: Impact on the Tensile Mechanical Properties

Andriollo, Tito ; Thorborg, Jesper ; Tiedje, Niels Skat ; Hattel, Jesper Henri
in: Materials Science Forum, vol: 925, pages: 465-472

Type: Journal article (Peer reviewed)

Status: Published     |    Year: 2018     |    DOI: https://doi.org/10.4028/www.scientific.net/MSF.925.465

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Revisiting models for spheroidal graphite growth

Bjerre, Mathias K. ; Azeem, Mohammed ; Lee, Peter D. ; Hattel, Jesper H. ; Tiedje, Niels S.
in: Materials Science Forum, vol: 925, pages: 118-124
Presented at:
11th International Symposium on the Science and Processing of Cast Iron

Type: Conference article (Peer reviewed)

Status: Published     |    Year: 2018     |    DOI: https://doi.org/10.4028/www.scientific.net/MSF.925.118

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Synchrotron quantification of graphite nodule evolution during the solidification of cast iron

Azeem, M.A. ; Bjerre, M. K. ; Atwood, R.C. ; Tiedje, N. ; Lee, P. D.
in: Acta Materialia, vol: 155, pages: 393-401

Type: Journal article (Peer reviewed)

Status: Published     |    Year: 2018     |    DOI: https://doi.org/10.1016/j.actamat.2018.06.007

 

Uncovering the local inelastic interactions during manufacture of ductile cast iron: How the substructure of the graphite particles can induce residual stress concentrations in the matrix

Andriollo, Tito ; Hellström, Kristina ; Sonne, Mads Rostgaard ; Thorborg, Jesper ; Tiedje, Niels Skat ; Hattel, Jesper Henri
in: Journal of the Mechanics and Physics of Solids, vol: 111, pages: 333–357

Type: Journal article (Peer reviewed)

Status: Published     |    Year: 2018     |    DOI: https://doi.org/10.1016/j.jmps.2017.11.005

2017
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A Contribution to the Understanding of the Combined Effect of Nitrogen and Boron in Grey Cast Iron

Strande, Knud ; Tiedje, Niels Skat ; Chen, Ming
in: International Journal of Metalcasting, vol: 11, issue: 1, pages: 61-70

Type: Journal article (Peer reviewed)

Status: Published     |    Year: 2017     |    DOI: https://doi.org/10.1007/s40962-016-0079-6

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Kinetics modeling of delta-ferrite formation and retainment during casting of supermartensitic stainless steel

Nießen, Frank ; Tiedje, Niels Skat ; Hald, John
in: Materials & Design, vol: 118, pages: 138-145

Type: Journal article (Peer reviewed)

Status: Published     |    Year: 2017     |    DOI: https://doi.org/10.1016/j.matdes.2017.01.026

2016
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A micro-mechanical analysis of thermo-elastic properties and local residual stresses in ductile iron based on a new anisotropic model for the graphite nodules

Andriollo, Tito ; Thorborg, Jesper ; Tiedje, Niels Skat ; Hattel, Jesper Henri
in: Modelling and Simulation in Materials Science and Engineering, vol: 24, issue: 5

Type: Journal article (Peer reviewed)

Status: Published     |    Year: 2016     |    DOI: https://doi.org/10.1088/0965-0393/24/5/055012

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Moisture diffusion coefficients determination of furan bonded sands and water based foundry coatings

Di Muoio, Giovanni Luca ; Tiedje, Niels Skat
in: The International Journal of Cast Metals Research, vol: 29, issue: 3, pages: 121-128

Type: Journal article (Peer reviewed)

Status: Published     |    Year: 2016     |    DOI: https://doi.org/10.1179/1743133615Y.0000000038

2015
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Achieving Control of Coating Process in your Foundry

Di Muoio, G. L. ; Tiedje, N. S.
in: Archives of Foundry Engineering, vol: 15, issue: 4, pages: 110-114

Type: Journal article (Peer reviewed)

Status: Published     |    Year: 2015     |    DOI: https://doi.org/10.1515/afe-2015-0089

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Modeling of damage in ductile cast iron – The effect of including plasticity in the graphite noduless

Andriollo, Tito ; Thorborg, Jesper ; Tiedje, Niels Skat ; Hattel, Jesper Henri
in: I O P Conference Series: Materials Science and Engineering, vol: 84
Presented at:
14th International Conference on Modelling of Casting, Welding and Advanced Solidification Processes

Type: Conference article (Peer reviewed)

Status: Published     |    Year: 2015     |    DOI: https://doi.org/10.1088/1757-899X/84/1/012027

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Modelling the solidification of ductile cast iron parts with varying wall thicknesses

Bjerre, Mathias Karsten ; Tiedje, Niels Skat ; Thorborg, Jesper ; Hattel, Jesper Henri
in: I O P Conference Series: Materials Science and Engineering, vol: 84
Presented at:
14th International Conference on Modelling of Casting, Welding and Advanced Solidification Processes

Type: Conference article (Peer reviewed)

Status: Published     |    Year: 2015     |    DOI: https://doi.org/10.1088/1757-899X/84/1/012038

 

Thermal distortion of disc-shaped ductile iron castings in vertically parted moulds

Vedel-Smith, Nikolaj Kjelgaard ; Rasmussen, Jakob ; Tiedje, Niels Skat
in: Journal of Materials Processing Technology, vol: 217, pages: 262-271

Type: Journal article (Peer reviewed)

Status: Published     |    Year: 2015     |    DOI: https://doi.org/10.1016/j.jmatprotec.2014.11.025

2013
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A new multi-zone model for porosity distribution in Al–Si alloy castings

Tiedje, Niels Skat ; Taylor, John A. ; Easton, Mark A.
in: Acta Materialia, vol: 61, issue: 8, pages: 3037-3049

Type: Journal article (Peer reviewed)

Status: Published     |    Year: 2013     |    DOI: https://doi.org/10.1016/j.actamat.2013.01.064

 

A non-contact 3D method to characterize the surface roughness of castings

Nwaogu, Ugochukwu Chibuzoh ; Tiedje, Niels Skat ; Hansen, Hans Nørgaard
in: Journal of Materials Processing Technology, vol: 213, issue: 1, pages: 59-68

Type: Journal article (Peer reviewed)

Status: Published     |    Year: 2013     |    DOI: https://doi.org/10.1016/j.jmatprotec.2012.08.008

 

Investigation on the Effect of Sulfur and Titanium on the Microstructure of Lamellar Graphite Iron

Moumeni, Elham ; Stefanescu, Doru Michael ; Tiedje, Niels Skat ; Larrañaga, Pello ; Hattel, Jesper Henri
in: Metallurgical and Materials Transactions A, vol: 44, issue: 11, pages: 5134-5146

Type: Journal article (Peer reviewed)

Status: Published     |    Year: 2013     |    DOI: https://doi.org/10.1007/s11661-013-1897-2

 

Modelling Eutectic Growth in Unmodified and Modified Near-Eutectic Al-Si Alloy

Tiedje, Niels Skat ; Hattel, Jesper Henri ; Taylor, John A. ; Easton, Mark A.
in: Materials Science Forum, vol: 765, pages: 160-164
Presented at:
6th International Light Metals Technology Conference

Type: Conference article (Peer reviewed)

Status: Published     |    Year: 2013     |    DOI: https://doi.org/10.4028/www.scientific.net/MSF.765.160

2012
 

Design and production of a novel sand materials strength testing machine for foundry applications

Nwaogu, Ugochukwu Chibuzoh ; Hansen, K. S. ; Tiedje, Niels Skat
in: International Foundry Research, vol: 64, issue: 2

Type: Journal article (Peer reviewed)

Status: Published     |    Year: 2012

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Feeding and Distribution of Porosity in Cast Al-Si Alloys as Function of Alloy Composition and Modification

Tiedje, Niels Skat ; Taylor, John A. ; Easton, Mark A.
in: Metallurgical and Materials Transactions A - Physical Metallurgy and Materials Science, vol: 43, issue: 12, pages: 4846-4858

Type: Journal article (Peer reviewed)

Status: Published     |    Year: 2012     |    DOI: https://doi.org/10.1007/s11661-012-1308-0

 

Mechanical properties of chemically bonded sand core materials dipped in sol-gel coating impregnated with filter

Nwaogu, Ugochukwu Chibuzoh ; Tiedje, Niels Skat
in: International Journal of Cast Metals Research, vol: 25, issue: 5, pages: 307-317

Type: Journal article (Peer reviewed)

Status: Published     |    Year: 2012     |    DOI: https://doi.org/10.1179/1743133612Y.0000000013

 

Using sol-gel component as additive to foundry coatings to improve casting quality

Nwaogu, Ugochukwu Chibuzoh ; Poulsen, T. ; Gravesen, B. ; Tiedje, Niels Skat
in: International Journal of Cast Metals Research, pages: 176-187

Type: Journal article (Peer reviewed)

Status: Published     |    Year: 2012     |    DOI: https://doi.org/10.1179/1743133611Y.0000000038

2011
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Foundry Coating Technology: A Review

Nwaogu, Ugochukwu Chibuzoh ; Tiedje, Niels Skat
in: Materials Sciences and Applications, vol: 2, issue: 8, pages: 1143-1160

Type: Journal article (Peer reviewed)

Status: Published     |    Year: 2011     |    DOI: https://doi.org/10.4236/msa.2011.28155

 

Investigation of the stability of melt flow in gating systems

Tiedje, Niels Skat ; Larsen, Per
in: Metallurgical and Materials Transactions B - Process Metallurgy and Materials Processing Science, vol: 42B, issue: 1, pages: 189-201

Type: Journal article (Peer reviewed)

Status: Published     |    Year: 2011     |    DOI: https://doi.org/10.1007/s11663-010-9446-5

 

New sol–gel refractory coatings on chemically-bonded sand cores for foundry applications to improve casting surface quality

Nwaogu, Ugochukwu Chibuzoh ; Poulsen, T. ; Stage, R.K. ; Bischoff, C. ; Tiedje, Niels Skat
in: Surface and Coatings Technology, vol: 205, issue: 16, pages: 4035-4044

Type: Journal article (Peer reviewed)

Status: Published     |    Year: 2011     |    DOI: https://doi.org/10.1016/j.surfcoat.2011.02.042

2010
 

Emission of organic compounds from mould and core binders used for casting iron, aluminium and bronze in sand moulds

Tiedje, Niels Skat ; Crepaz, Rudolf ; Eggert, Torben ; Bey, Niki
in: Journal of Environmental Science and Health. Part A: Toxic Hazardous Substances and Environmental Engineering, vol: 45, issue: 14, pages: 1866-1876

Type: Journal article (Peer reviewed)

Status: Published     |    Year: 2010     |    DOI: https://doi.org/10.1080/10934529.2010.520595

 

Solidification, processing and properties of ductile cast iron

Tiedje, Niels Skat
in: Materials Science and Technology, vol: 26, issue: 5, pages: 505-514

Type: Journal article (Peer reviewed)

Status: Published     |    Year: 2010     |    DOI: https://doi.org/10.1179/026708310X12668415533649

2009
 

Analyse experimentale des flux des fonte G.I. dans les systèmes d´alimentation à débit Côntrolé

Skov-Hansen, Søren ; Green, Nick R. ; Tiedje, Niels Skat
in: Hommes et Fonderie, vol: 396, pages: 9-16

Type: Journal article (Peer reviewed)

Status: Published     |    Year: 2009

 

Influence of rare earths on shrinkage porosity in thin walled ductile cast iron

Pedersen, Karl Martin ; Tiedje, Niels Skat
in: International Journal of Cast Metals Research, vol: 22, issue: 1-4, pages: 302-305
Presented at:
International Conference on Advances in Solidification Process

Type: Conference article (Peer reviewed)

Status: Published     |    Year: 2009     |    DOI: https://doi.org/10.1179/136404609X367830

 

Solidification paths in modified Inconel 625 weld overlay material

Chandrasekaran, Karthik ; Tiedje, Niels Skat ; Hald, John
in: International Journal of Cast Metals Research, vol: 22, issue: 1-4, pages: 306-310
Presented at:
2nd International Conference on Advances in Solidification Processes

Type: Conference article (Peer reviewed)

Status: Published     |    Year: 2009     |    DOI: https://doi.org/10.1179/136404609X368046

2008
 

Experimental analysis of flow of ductile cast iron in stream lined gating systems

Skov-Hansen, Søren ; Green, Nick ; Tiedje, Niels Skat
in: Giessereiforschung, vol: 60, issue: 4, pages: number 03
Presented at:
68th World Foundry Congress

Type: Conference article (Peer reviewed)

Status: Published     |    Year: 2008

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Graphite nodule count and size distribution in thin-walled ductile cast iron

Pedersen, Karl Martin ; Tiedje, Niels Skat
in: Materials Characterization, vol: 59, issue: 8, pages: 1111-1121

Type: Journal article (Peer reviewed)

Status: Published     |    Year: 2008     |    DOI: https://doi.org/10.1016/j.matchar.2007.09.001

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Temperature measurement during solidification of thin wall ductile cast iron. Part 1: Theory and experiment

Pedersen, Karl Martin ; Tiedje, Niels Skat
in: Measurement, vol: 41, issue: 5, pages: 551

Type: Journal article (Peer reviewed)

Status: Published     |    Year: 2008     |    DOI: https://doi.org/10.1016/j.measurement.2007.05.002

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Temperature measurement during solidification of thin wall ductile cast iron. Part 2: Numerical simulations

Pedersen, Karl Martin ; Tiedje, Niels Skat
in: Measurement, vol: 41, issue: 4, pages: 341-348

Type: Journal article (Peer reviewed)

Status: Published     |    Year: 2008     |    DOI: https://doi.org/10.1016/j.measurement.2007.05.003

2007
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Experimental validation of error in temperature measurements in thin walled ductile iron castings

Pedersen, Karl Martin ; Tiedje, Niels Skat
in: International Journal of Cast Metals Research, vol: 20, issue: 2, pages: 84-89

Type: Journal article (Peer reviewed)

Status: Published     |    Year: 2007     |    DOI: https://doi.org/10.1179/136404607X226838

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Undercooling and nodule count in thin walled ductile iron castings

Pedersen, Karl Martin ; Tiedje, Niels Skat
in: International Journal of Cast Metals Research, vol: 20, issue: 3, pages: 145-150

Type: Journal article (Peer reviewed)

Status: Published     |    Year: 2007     |    DOI: https://doi.org/10.1179/136404607X239816

2006
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Numerical modelling of thin-walled hypereutectic ductile cast iron parts

Pedersen, Karl Martin ; Hattel, Jesper Henri ; Tiedje, Niels Skat
in: Acta Materialia, vol: 54, pages: 5103-5114

Type: Journal article (Peer reviewed)

Status: Published     |    Year: 2006     |    DOI: https://doi.org/10.1016/j.actamat.2006.06.049

2005
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Nucleation and solidification of thin walled ductile iron - Experiments and numerical simulation

Pedersen, Karl Martin ; Tiedje, Niels Skat
in: Materials Science and Engineering: A - Structural Materials: Properties, Microstructure and Processing, vol: 413-414, pages: 358-362
Presented at:
International Conference on Advances in Solidification Processes

Type: Conference article (Peer reviewed)

Status: Published     |    Year: 2005     |    DOI: https://doi.org/10.1016/j.msea.2005.08.158

2003
 

Støberiteknik ved DTU. Status for 2002. Del 1.

Tiedje, Niels
in: Støberiet, vol: 2, pages: 11-14

Type: Journal article (Peer reviewed)

Status: Published     |    Year: 2003

 

Støberiteknik ved DTU, Status for 2002. Del 2.

Tiedje, Niels
in: Støberiet, vol: 3, pages: [5 pp.]

Type: Journal article (Peer reviewed)

Status: Published     |    Year: 2003