Numerical simulation of Pearlite formation during welding of rails

Leonhard Andreas Weingrill, Mohammad Bagher Nasiri, Norbert Enzinger

Research output: Contribution to conferencePaperpeer-review


In this work, a thermo-metallurgical coupled simulation model of welding of R350HT pearlitic rail steel was
realized to estimate the mechanical properties in the HAZ. The applied approach was to estimate the hardness of
pearlitic phase fractions by calculating the interlamellar spacing. This was realized in a methodology of multiple
calculation steps. Therein, MATLAB®-routines are used to calculate parameters for a metallurgical model to be
used in SYSWELD®, based on a simulated TTT-diagram from JMatPro® and an experimentally determined
welding- CCT-diagram of R350HT rail steel. This so established metallurgical model was verified by a simulation
of dilatometry tests in SYSWELD® and subsequent quantitative comparison to experimental results. In a final
step three more MATLAB®-routines are used to calculate phase fractions, interlamellar spacing and hardness for
a practical example. Therefore, measured temperature curves from instrumented flash-butt welding (FBW)
experiments of standard rails were used as input. The results of the simulation are compared to real welds’ phase
fractions and hardness values in the HAZ and showed very good agreement.
Translated title of the contributionNumerische Simulation der Perlitbildung beim Schienenschweißen
Original languageEnglish
Number of pages602
Publication statusPublished - 13 Oct 2016
Event10th International Conference on Trends in Welding Research - Hitotsubashi Hall, National Center of Sciences Building, Tokyo, Japan
Duration: 11 Oct 201614 Oct 2016


Conference10th International Conference on Trends in Welding Research
Internet address

Cite this