Parameter identification for thermo-mechanical constitutive modeling to describe process-induced residual stresses and phase transformations in low-carbon steels

Muhammed Zubair Shahul Hameed, Christoph Hubertus Wölfle, Tobias Robl, Thomas Obermayer, Stefan Rappl, Kai Osterminski, Christian Krempaszky, Ewald Werner

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Reinforcing steel bars (rebars) are widely manufactured using the Tempcore™ process. Several studies have been conducted analyzing the effect of the heat treatment route on the strength and corrosion resistance of rebars, but knowledge of its effects on the residual stresses of the finished product are largely lacking. This paper presents experimental investigations to identify the material parameters necessary to simulate the Tempcore™ process using thermo-elasto-plastic constitutive modeling in order to study the generation of residual stresses during the manufacturing process. Mechanical parameters such as yield strength at elevated temperatures and elastic constants were determined experimentally. A continuous cooling transformation diagram needed to model the phase transformations was also identified and is presented here. Residual stress distributions in the surface region of the rebar were characterized using X-ray diffraction. Further characterizations of microstructure, chemical composition, and hardness were carried out. The constitutive modeling approach for the numerical simulation is briefly described for which the experimentally determined parameters are required as input.

Original languageEnglish
Article number550
Pages (from-to)1-16
Number of pages16
JournalApplied Sciences (Switzerland)
Volume11
Issue number2
DOIs
StatePublished - 2 Jan 2021

Keywords

  • Constitutive modeling
  • Quenching
  • Reinforcing steel
  • Residual stress
  • Tempcore™ process

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