Material characteristics in welding processes and local heating events (CHARMEC MU36)
Research Project , 2019 – 2024

Welding and grinding processes induce local heating that can deteriorate the properties of the base material. In welding the situation can be improved by introducing fillers to modify the steel chemistry and by controlling heat supply to create beneficial heat treatments. Short term local friction heating in the wheel-rail contact is another scenario causing similar temperature elevations. If the temperature rises above ca 800 °C in rail and wheel steels phase transformations take place. These result in residual stresses and localisation of strains upon subsequent rolling contact loading, which can cause crack initiation in rail and wheel surfaces. Also lower peak temperatures can lead to residual stress fields and changed strength. Project MU36 aims at expanding the knowledge of material behaviour under combined thermal and mechanical loadings. Accurate prediction of the resulting gradients in mechanical properties and residual stress is crucial for a proper judgement of rolling contact fatigue damage accumulation in railway operations. The present project will build on previous experimental works and, in co-operation with project MU37, lead to accurate and predictive methods supporting technology development and decreasing LCC.

This is a doctoral project. Ms Erika Steyn is the doctoral student and Professor Johan Ahlström the project leader and supervisor. Professor Magnus Ekh is assistant supervisor.  

Participants

Erika Steyn (contact)

Doktorand vid Chalmers, Industrial and Materials Science, Engineering Materials

Johan Ahlström

Biträdande professor vid Chalmers, Industrial and Materials Science, Engineering Materials

Magnus Ekh

Professor vid Chalmers, Industrial and Materials Science, Material and Computational Mechanics

Collaborations

Abetong AB

Växjö, Sweden

Atkins Sverige AB

Stockholm, Sverige

Bombardier Transportation GmbH

Siegen, Germany

Faiveley Transport Nordic AB

Landskrona, Sweden

Green Cargo

Solna, Sweden

Lucchini Sweden AB

Surahammar, Sweden

SJ AB

Stockholm, Sweden

Swedish Transport Administration

Borlänge, Sweden

SweMaint AB

Göteborg, Sweden

voestalpine Schienen GmbH

Leoben, Austria

voestalpine VAE GmbH

Zeltweg, Austria

Funding

Chalmers Railway Mechanics (CHARMEC)

Funding Chalmers participation during 2019–2024

European Commission (Horizon 2020)

Funding Chalmers participation during 2019–2024

Related Areas of Advance and Infrastructure

Sustainable development

Driving Forces

Transport

Areas of Advance

Chalmers Materials Analysis Laboratory

Infrastructure

Materials Science

Areas of Advance

More information

Project Web Page

charmec.chalmers.se

Latest update

2020-03-05