Johan Ahlström

Biträdande professor at Materials Technology

​Johan Ahlström's research and teaching concern the behaviour of Engineering Metals both in the production process and as used within products in service. The research aims at creating knowledge to enable economically, environmentally and socially sustainable solutions for transport and production industries.

Source: chalmers.se

Projects

2015–2019

INTELLISWITCH - Intelligent Quality Assessment of Railway Switches and Crossings

Johan Ahlström Materials Technology
Innovation Fund Denmark

2013–2018

Development of analysis models for thermomechanical fatigue

Christer Persson Materials Technology
Johan Ahlström Materials Technology
Swedish Energy Agency

There might be more projects where Johan Ahlström participates, but you have to be logged in as a Chalmers employee to see them.

Publications

2016

Alloy design for intrinsically ductile refractory high-entropy alloys

Saad Sheikh, Samrand Shafeie, Hu Qiang et al
Journal of Applied Physics. Vol. 120 (16), p. Art no 164902
Scientific journal article - peer reviewed
2016

Residual stresses generated by repeated local heating events – Modelling of possible mechanisms for crack initiation

Johan Ahlström,
Wear. Vol. 366 (SI), p. 180-187
Scientific journal article - peer reviewed
2016

3D characterization of rolling contact fatigue crack networks

Casey Jessop, Johan Ahlström, Lars Hammar et al
Wear. Vol. 366 (SI), p. 392-400
Scientific journal article - peer reviewed
2016

Temperature-dependent evolution of the cyclic yield stress of railway wheel steels

Johan Ahlström, Elena Kabo, Anders Ekberg et al
Wear. Vol. 366 (SI), p. 378-382
Scientific journal article - peer reviewed
2016

Mechanical properties and fatigue behaviour of railway wheel steels as influenced by mechanical and thermal loadings

Dimitrios Nikas, Johan Ahlström, Amir Malakizadi et al
Wear. Vol. 366 (SI), p. 407-415
Scientific journal article - peer reviewed
2015

3D characterization of RCF crack networks

Casey Jessop, Johan Ahlström, Lars Hammar et al
10th International Conference on Contact Mechanics of Wheel / Rail Systems, CM 2015, Colorado Springs, United States, 30 August - 3 September 2015
Conference paper - peer reviewed
2015

Mechanical properties and fatigue behavior of railway wheel steels as influenced by mechanical and thermal loadings

Dimitrios Nikas, Johan Ahlström, Amir Malakizadi et al
10th International Conference on Contact Mechanics of Wheel / Rail Systems, CM 2015, Colorado Springs, United States, 30 August - 3 September 2015
Conference paper - peer reviewed
2015

Crack initiation caused by repeated local heating events – Modelling of possible mechanisms

Johan Ahlström,
Proceedings of the 10th International Conference on Contact Mechanics and Wear of Rail/Wheel Systems (CM2015).
Conference paper - peer reviewed
2015

Temperature-dependent evolution of the cyclic yield stress of railway wheel steels

Johan Ahlström, Elena Kabo, Anders Ekberg et al
Proceedings of the 10th International Conference on Contact Mechanics and Wear of Rail/Wheel Systems (CM2015)
Conference paper - peer reviewed
2015

Thermomechanical cracking of railway wheel treads: a combined experimental and numerical approach

Ali Esmaeili, Sara Caprioli, Anders Ekberg et al
Proceedings of the 10th International Conference on Contact Mechanics and Wear of Rail/Wheel Systems (CM2015), p. 8
Conference paper - peer reviewed
2015

MODELING EVOLUTION OF ANISOTROPY IN PEARLITIC STEEL DURING COLD WORKING

Knut Andreas Meyer, Magnus Ekh, Jim Brouzoulis et al
Proceedings of the NSCM28, p. 111-114
Conference paper - non peer reviewed
2015

Characterization of microstructural changes in near pearlitic steels using orientation imaging microscopy - influence of pre-deformation on local sensitivity to thermal degradation

Dimitrios Nikas, Johan Ahlström,
36th Riso International Symposium on Materials Science. Vol. 89 (1), p. Art. no. 012039
Conference paper - peer reviewed
2015

Temperature and strain rate effects on the mechanical behavior of dual phase steel

Yu Cao, Birger Karlsson, Johan Ahlström et al
Materials Science & Engineering: A. Vol. 636, p. 124-132
Scientific journal article - peer reviewed
2015

The influence of temperatures and strain rates on the mechanical behavior of dual phase steel in different conditions

Yu Cao, Johan Ahlström, Birger Karlsson et al
Journal of Materials Research and Technology. Vol. 4 (1), p. 68-74
Scientific journal article - peer reviewed
2014

Thermal deterioration of railway wheel steels

Dimitrios Nikas, Johan Ahlström,
35th Risø International Symposium on Materials Science,Risø,Denmark, 09/2014
Conference paper - peer reviewed
2014

Residual stresses in martensite after multiple heating events

Johan Ahlström,
5th International Conference on Thermal Process Modeling and Computer Simulation, ICTPMCS 2014; Gaylord Palms Resort and Convention CenterOrlando; United States; 16 June 2014 through 18 June 2014, p. 192-198
Conference paper - peer reviewed
2014

Rapid thermomechanical tempering of iron–carbon martensite

Krste Cvetkovski, Johan Ahlström, Christer Persson et al
Materials Science and Technology. Vol. 30 (14), p. 1832-1834
Scientific journal article - peer reviewed
2014

Estimation of microscale strain fields in a pearlitic steel using DIC and in-situ SEM

Erik Lindfeldt, Johan Ahlström, Magnus Hörnqvist et al
Proceedings of 14th European Mechanics of Materials Conference - EMMC14
Conference paper - peer reviewed
2014

Mechanical properties of bulk- and hybrid nanocrystalline materials

Uta Klement, Seyedeh Nooshin Mortazavi, Johan Ahlström et al
Proceedings of the 35th Riso International Symposium on Materials Science, p. 349-355
Conference paper - peer reviewed
2014

Identification of microscale strain fields from in-situ SEM images of a pearlitic steel using DIC

Erik Lindfeldt, Johan Ahlström, Magnus Hörnqvist et al
Preprint
2014

3D characterisation of RCF crack networks

Johan Ahlström, Casey Jessop, Lars Hammar et al
MATEC Web of Conferences. Vol. 12
Conference paper - peer reviewed
2014

Analysis of wear debris in rolling contact fatigue cracks of pearlitic railway wheels

Krste Cvetkovski, Johan Ahlström, Mats Norell et al
Wear. Vol. 314 (1-2), p. 51-56
Scientific journal article - peer reviewed
2013

Lcf loop shape in near pearlitic steels – influence of temperature

Johan Ahlström,
Proceedings of 7th International Conference on Low Cycle Fatigue, Aachen, Germany, September 9–11, 2013, p. 81-86
Conference paper - peer reviewed
2013

Characterisation of plastic deformation and thermal softening of the surface layer of railway passenger wheel treads

Krste Cvetkovski, Johan Ahlström,
Wear. Vol. 300 (1-2), p. 200-204
Scientific journal article - peer reviewed
2013

Influence of short heat pulses on properties of martensite in medium carbon steels

Krste Cvetkovski, Johan Ahlström, Birger Karlsson et al
Materials Science and Engineering: A. Vol. 561, p. 321-328
Scientific journal article - peer reviewed
2012

Subsurface crack networks and RCF surface cracks in pearlitic railway wheels

Krste Cvetkovski, Johan Ahlström, Christer Persson et al
9th International Conference on Contact Mechanics and Wear of Rail/Wheel Systems, CM 2012; Chengdu; China; 27 August 2012 through 30 August 2012, p. 425-431
Conference paper - peer reviewed
2012

Modeling of Distortion during Casting and Machining of Aluminum Engine Blocks with Cast-in Gray Iron Liners

Johan Ahlström, Ragnar Larsson,
Materials Performance and Characterization. Vol. 9 (5), p. 1–19
Scientific journal article - peer reviewed
2011

Mechanical Behaviour of a Rephosphorized Steel for Car Body Applications — Effects of Temperature, Strain Rate and Pre-treatment

Yu Cao, Johan Ahlström, Birger Karlsson et al
Journal of Engineering Materials and Technology. Vol. 133, p. 021019-1 - 021019-11
Scientific journal article - peer reviewed
2011

Thermal degradation of pearlitic steels: influence on mechanical properties including fatigue behaviour

Krste Cvetkovski, Johan Ahlström, Birger Karlsson et al
Materials Science and Technology. Vol. 27 (3), p. 648-654
Scientific journal article - peer reviewed
2011

Monotonic and cyclic deformation of a high silicon pearlitic wheel steel

Krste Cvetkovski, Johan Ahlström, Birger Karlsson et al
Wear. 8th Conference on Contact Mechanics and Wear of Rail/Wheel System, Florence, Italy 2009. Vol. 271 (1-2), p. 382-387
Conference paper - peer reviewed
2010

Modelling of distortion during casting and machining

Johan Ahlström, Ragnar Larsson,
Conference proceedings ICTPMCS-2010, 31 May – 2 June 2010, Shanghai, China, p. 8 pp
Conference paper - peer reviewed
2010

Short-time tempering kinetics of quench hardened pearlitic steels

Johan Ahlström, Krste Cvetkovski, Birger Karlsson et al
Conference proceedings ICTPMCS-2010, 31 May – 2 June 2010, Shanghai, China, p. 6 pp
Conference paper - peer reviewed
2010

Thermal softening of fine pearlitic steel and its effect on the fatigue behaviour

Krste Cvetkovski, Johan Ahlström, Birger Karlsson et al
Procedia Engineering: 10th International Fatigue Congress, FATIGUE 2010; Prague; Czech Republic; 6 June 2010 through 11 June 2010. Vol. 2 (1), p. 541-545
Conference paper - peer reviewed
2010

Low cycle fatigue and deformation behaviour of austenitic manganese steel in rolled and as-cast conditions

Martin Schilke, Johan Ahlström, Birger Karlsson et al
Procedia Engineering. Vol. 2 (1), p. 623-628
Conference paper - peer reviewed
2009

Aspects of viscoplasticty on manufacturing induced out-of-roundness in engine cylinder liners

Johan Ahlström, Ragnar Larsson, Magnus Ekh et al
Proc. of 1st International Conference on Material Modelling
Conference paper - peer reviewed
2009

Monotonic and cyclic deformation of a high silicon pearlitic wheel steel

Krste Cvetkovski, Johan Ahlström, Birger Karlsson et al
Proceedings of 8th International Conference on Contact Mechanics and Wear of Rail/Wheel Systems, Centro Sviluppe Materiali S.p.A., Firenze, Italy. Vol. 2, p. 557-563
Conference paper - peer reviewed
2009

Stiffness changes during fatigue of railway steels R8/R8T at ambient and subzero temperatures

Johan Ahlström, Birger Karlsson,
Proceedings of 8th International Conference on Contact Mechanics and Wear of Rail/Wheel Systems, Centro Sviluppe Materiali S.p.A., Firenze, Italy. Vol. 1, p. 7-9
Conference paper - peer reviewed
2009

Monotonic and cyclic deformation of medium and high strength rail steels

Johan Ahlström, Martin Schilke, Birger Karlsson et al
Proceedings of 8th International Conference on Contact Mechanics and Wear of Rail/Wheel Systems, Centro Sviluppe Materiali S.p.A., Firenze, Italy. Vol. 1, p. 3-5
Conference paper - peer reviewed
2009

Modified Railway Wheel Steels: Production and Evaluation of Mechanical Properties with Emphasis on Low-Cycle Fatigue Behavior

Johan Ahlström, Birger Karlsson,
Metallurgical and Materials Transactions A. Vol. 40A (7), p. 1557-1567
Scientific journal article - peer reviewed
2008

Low cycle fatigue behaviour of alternative steels for highly stressed rail components

Johan Ahlström, Birger Karlsson,
Proc. 6th Intern. Conf. on Low Cycle Fatigue (P.D. Portella, T. Beck, M. Okazaki - eds.), Deutscher Verband für Materialforschung och -prüfung (DVM), Berlin 2008, p. Pp. 747-752
Conference paper - peer reviewed
2008

Unloading stiffness of near fully pearlitic steel UIC-R8/R8T during cyclic plastic straining

Magnus Hörnqvist, Birger Karlsson, Johan Ahlström et al
Proc. 6th Intern. Conf. on Low Cycle Fatigue (P.D. Portella, T. Beck, M. Okazaki - eds.). Deutsche Verband für Materialforschung und -prüfung (DVM), Berlin 2008 , p. Pp. 487-492
Conference paper - peer reviewed
2006

Static and Cyclic Behaviour of Near Fully Pearlitic Railway Steel - Influence of Temperature and Prestrain

Niklas Köppen, Johan Ahlström, Birger Karlsson et al
Proc. 9th International Fatigue Congress, Atlanta, May 2006, p. 8 pages
Conference paper - peer reviewed
2006

The fatigue properties of modified railway wheel steels as influenced by low temperature and grain size

Johan Ahlström, Birger Karlsson,
9th International Fatigue Congress, Atlanta 2006, p. 10 pages
Conference paper - peer reviewed
2006

Parameter identification and modeling of large ratcheting strains in carbon steel

Göran Johansson, Johan Ahlström, Magnus Ekh et al
Computers and Structures. Vol. 84, p. 1002-1011
Scientific journal article - peer reviewed
2005

Using a MATLAB Exercise to Improve the Teaching and Learning of Heat Conduction During Welding

Johan Ahlström, Michael Christie,
International Journal of Engineering Education. Vol. 21 (5), p. 769-777
Scientific journal article - peer reviewed
2005

Fatigue behaviour of rail steel - a comparison between strain and stress controlled loading

Johan Ahlström, Birger Karlsson,
Wear. Vol. 258 (7-8), p. 1187-1193
Scientific journal article - peer reviewed
2005

Low cycle fatigue behaviour of railway wheel steels including temperature effects

Johan Ahlström, Birger Karlsson,
Proceedings of 11th Intern. Conf. on Fracture, Torino, March 2005, p. 6 pages
Conference paper - peer reviewed
2004

Modelling of Laser Cladding of Medium Carbon Steel - a First Approach

Johan Ahlström, Birger Karlsson, Simon Niederhauser et al
Journal de Physique IV. Vol. 120, p. 405-412
Scientific journal article - peer reviewed
2002

Modelling of heat conduction and phase transformations during sliding of railway wheels

Johan Ahlström, Birger Karlsson,
Wear. Vol. 253 (1-2), p. 291-300
Scientific journal article - peer reviewed
2001

Thermal and mechanical behaviour of railway wheel steel

Johan Ahlström,
Doctoral thesis
2000

Cyclic deformation and fatigue behaviour of microalloyed carbon steels for use in railway wheels

Johan Ahlström, Birger Karlsson,
Advances in mechanical behaviour, plasticity and damage-Proceedings of EUROMAT 2000 / D. Miannay, P. Costa, D. Francois, A. Pineau, p. 1021-1026
Conference paper - peer reviewed
1999

Fatigue crack nucleation induced by surface shearing of railway wheels

Johan Ahlström, Birger Karlsson,
Fatigue '99 / X.R. Wu, Z.G. Wang. Vol. 4, p. 2609-2614
Conference paper - peer reviewed
1999

Analytical 1D model for analysis of the thermally affected zone formed during railway wheel skid

Johan Ahlström, Birger Karlsson,
Wear. Vol. 232 (1), p. 15-24
Scientific journal article - peer reviewed
1999

Microstructural evaluation and interpretation of the mechanically and thermally affected zone under railway wheel flats

Johan Ahlström, Birger Karlsson,
Wear. Vol. 232 (1), p. 1-14
Scientific journal article - peer reviewed
1997

Sample preparation and microstructural characterization of the gamma titanium aluminide Ti-48Al-2W-0.5Si

Viktor Recina, Johan Ahlström, Birger Karlsson et al
Materials Characterization. Vol. 38 (4-5), p. 287-300
Scientific journal article - peer reviewed