[HTML][HTML] In-situ SEM characterization and numerical modelling of bainite formation and impingement of a medium-carbon, low-alloy steel

O Seppälä, A Pohjonen, J Mendonça, V Javaheri… - Materials & Design, 2023 - Elsevier
A novel in-situ scanning electron microscope (SEM) characterization technique for
observing phase transformation is developed and its results studied and compared to well …

[HTML][HTML] Physically based modeling, characterization and design of an induction hardening process for a new slurry pipeline steel

V Javaheri, A Pohjonen, JI Asperheim, D Ivanov… - Materials & Design, 2019 - Elsevier
Numerical and Gleeble experimental data are combined to predict potential microstructure
and hardness profiles through the wall thickness of an induction hardened slurry …

[HTML][HTML] Coupled heat transfer and phase transformations of dual-phase steel in coil cooling

J Ilmola, A Pohjonen, S Koskenniska, O Seppälä… - Materials Today …, 2021 - Elsevier
Dual-phase steels are generally used in the car industry due to high tensile strength and
good formability, which are obtained by a mixture of bainite and ferrite phases. This …

[HTML][HTML] Numerical and experimental study on thermo-mechanical processing of medium-carbon steels at low temperatures for achieving ultrafine-structured bainite

A Pohjonen, P Kaikkonen, O Seppälä, J Ilmola… - Materialia, 2021 - Elsevier
A combination of experimental and numerical approaches was applied for constructing a
dynamic model for thermomechanical processing, which was used for simulating laboratory …

[HTML][HTML] Coupled model for carbon partitioning, diffusion, Cottrell atmosphere formation and cementite precipitation in martensite during quenching

A Pohjonen, SR Babu, VV Visuri - Computational Materials Science, 2022 - Elsevier
High-strength low alloy martensitic alloy steels are produced by quenching methods to
achieve a martensitic microstructure. The carbon supersaturation of the martensitic structure …

Simulation of bainite and martensite formation using a novel cellular automata method

O Seppälä, A Pohjonen, A Kaijalainen, J Larkiola… - Procedia …, 2018 - Elsevier
A novel two-dimensional cellular automata model for simulating the formation of lath
martensite and bainite in steels during cooling is presented. The model is parameterized …

Coupled multiscale and multiphysical analysis of hot steel strip mill and microstructure formation during water cooling

J Ilmola, A Pohjonen, O Seppälä, O Leinonen… - Procedia …, 2018 - Elsevier
In order to study the coupled effect of rolling deformation, heat transfer and water cooling on
microstructure formation of a steel strip, a multiscale and multiphysical FE-model is …

Simulation and experimental studies of induction hardening behavior of a new medium-carbon, low-alloy wear resistance steel

V Javaheri, JI Asperheim, B Grande, S Kolli… - … the international journal …, 2020 - emerald.com
Purpose The purpose of this work is to determine the induction hardening behavior of a new
steel composition. For this purpose, Flux2D commercial software together with a Gleeble …

Semi-automatic optimization of steel heat treatments for achieving desired microstructure

A Pohjonen, V Javaheri, J Paananen… - Proceedings of The …, 2021 - oulurepo.oulu.fi
The thermo-mechanical processing history together with the steel composition defines the
final microstructure, which in turn produces the macroscopic mechanical properties of the …

Determination of effective heat transfer coefficient for water spray cooling of steel

S Uusikallio, S Koskenniska, J Ilmola, J Paavola… - Procedia …, 2020 - Elsevier
Accurate control of the temperature of the workpiece is crucial when carrying out thermal
processing of steel. Effective heat transfer coefficient for water cooling of hot rolled steel was …