Johan Ahlström
Johan Ahlström's research concerns the behaviour of engineering metals both during production and in service. Experimental characterization of the deformation behaviour and its relation to microstructure, temperature and strain rate combined with numerical modelling give possibilities for physical interpretation and prediction of the behaviour in a certain environment. Connected phenomena include phase transformations, fatigue, residual stresses and crack growth. Methods used encompass biaxial and thermo-mechanical mechanical testing, dilatometry, X-ray tomography, X-ray diffraction, microscopy and spectroscopy.
Visar 93 publikationer
Thermomechanical testing and modelling of railway wheel steel
The role of accumulated plasticity on yield surface evolution in pearlitic steel
Effect of annealing on microstructure in railway wheel steel
CRACK INITIATION CRITERIA FOR DEFORMED ANISOTROPIC R260 RAIL STEEL
SIMULATION OF REPAIR WELDING ON PEARLITIC RAILWAY STEEL USING ADDITIVE MANUFACTURING EQUIPMENT
A method for in-field railhead crack detection using digital image correlation
Integrated Computational Material Design for PMC Manufacturing with Trapped Rubber
Anisotropic yield surfaces after large shear deformations in pearlitic steel
Damage evolution around white etching layer during uniaxial loading
Effect of strain gradient on the microstructure and mechanical properties of pearlitic steel
Thermomechanical fatigue of grey cast iron brake discs for heavy vehicles
High temperature bi-axial low cycle fatigue behaviour of railway wheel steel
Friction between pearlitic steel surfaces
Numerical investigation of crack initiation in rails and wheels affected by martensite spots
Friction between pearlitic steel surfaces
Modeling of kinematic hardening at large biaxial deformations in pearlitic rail steel
Characterization of deformed pearlitic rail steel
3D characterization of rolling contact fatigue crack networks
Temperature-dependent evolution of the cyclic yield stress of railway wheel steels
Alloy design for intrinsically ductile refractory high-entropy alloys
MODELING EVOLUTION OF ANISOTROPY IN PEARLITIC STEEL DURING COLD WORKING
Thermomechanical cracking of railway wheel treads: a combined experimental and numerical approach
Temperature-dependent evolution of the cyclic yield stress of railway wheel steels
Temperature and strain rate effects on the mechanical behavior of dual phase steel
3D characterization of RCF crack networks
Crack initiation caused by repeated local heating events – Modelling of possible mechanisms
3D characterisation of RCF crack networks
Mechanical properties of bulk- and hybrid nanocrystalline materials
Identification of microscale strain fields from in-situ SEM images of a pearlitic steel using DIC
Residual stresses in martensite after multiple heating events
Rapid thermomechanical tempering of iron–carbon martensite
Estimation of microscale strain fields in a pearlitic steel using DIC and in-situ SEM
Thermal deterioration of railway wheel steels
Analysis of wear debris in rolling contact fatigue cracks of pearlitic railway wheels
Lcf loop shape in near pearlitic steels – influence of temperature
Influence of short heat pulses on properties of martensite in medium carbon steels
Subsurface crack networks and RCF surface cracks in pearlitic railway wheels
Monotonic and cyclic deformation of a high silicon pearlitic wheel steel
Thermal softening of fine pearlitic steel and its effect on the fatigue behaviour
Short-time tempering kinetics of quench hardened pearlitic steels
Modelling of distortion during casting and machining
Stiffness changes during fatigue of railway steels R8/R8T at ambient and subzero temperatures
Monotonic and cyclic deformation of a high silicon pearlitic wheel steel
Monotonic and cyclic deformation of medium and high strength rail steels
Aspects of viscoplasticty on manufacturing induced out-of-roundness in engine cylinder liners
Low cycle fatigue behaviour of alternative steels for highly stressed rail components
Unloading stiffness of near fully pearlitic steel UIC-R8/R8T during cyclic plastic straining
Parameter identification and modeling of large ratcheting strains in carbon steel
Low cycle fatigue behaviour of railway wheel steels including temperature effects
Fatigue behaviour of rail steel - a comparison between strain and stress controlled loading
Using a MATLAB Exercise to Improve the Teaching and Learning of Heat Conduction During Welding
Modelling of Laser Cladding of Medium Carbon Steel - a First Approach
Modelling of heat conduction and phase transformations during sliding of railway wheels
Cyclic deformation and fatigue behaviour of microalloyed carbon steels for use in railway wheels
Analytical 1D model for analysis of the thermally affected zone formed during railway wheel skid
Fatigue crack nucleation induced by surface shearing of railway wheels
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Visar 9 forskningsprojekt
Materialkarakteristik vid svetsning och annan lokal upphettning (CHARMEC MU36)
Karakterisering av sprickinitiering och propagering i anisotropt material (CHARMEC MU35)
Numerisk simulering av svetsning och andra högtemperaturprocesser (CHARMEC MU37)
Inverkan av anisotropi på utmattningsprickor under rullkontakt (CHARMEC MU34)
INTELLISWITCH - Avanceret tilstandsvurdering af sporskifter
Modellering av termomekaniskt belastade räls- och hjulstål
Utveckling av analysmodeller för termomekanisk utmattning TMF i förbränningsmotorer
Modellering av egenskaper och skador i hjul- och rälmaterial (CHARMEC MU30)