Multi scale modeling of dual phase steels with integrated computational materials engineering framework

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2022-11-21

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Bakkalbaşı, Doğucan

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In this thesis, process-chain simulation of of Dual-Phase (DP) steels (DP600, DP800) with different chemical compositions and manufacturing histories is performed, in line with Integrated Computational Materials Engineering (ICME) principles. To do this, the required material data is acquired by multi-scale modelling, which enables bi-directional link between the material production processes with the manufacturing processes. The thesis consists of 2 important stages, each of which includes innovations in its own field, as well as combining many modern methods in an original way. In the first phase of the project, the focus is the inter-critical annealing (IA) process, one of the most important steps in DP steel production. First, the microstructure of the material is determined by computational thermodynamics/kinetics methods. Then, Thermodynamics Based Material Property Calculation (TBMPC) method is employed to determine mechanical properties of individual phases. TBMPC method has not yet been applied to these materials and processing methods. In the second phase, macroscopic mechanical properties are calculated from the individual properties of phases using the composite material theory. Two approaches used here: (a) Mean Field Homogenization and (b) Finite Element Representative Volume Element Homogenization. In the literature, there exist no studies employing MFH, which can be a robust alternative. Moreover, the Bauschinger effect is also studied in material models which has significant consequences on prediction of spring-back especially for multi-phase materials. The findings could provide a better insight for further improvement of performance of DP steels. Moreover, suggested methods have a potential to replace experimental approaches in the future.

Subject Keywords

Integrated Computational Materials Engineering (ICME), multi-scale modeling and simulation, dual-phase (DP) steels

URI

https://hdl.handle.net/11511/101258

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

D. Bakkalbaşı, “Multi scale modeling of dual phase steels with integrated computational materials engineering framework,” M.S. - Master of Science, Middle East Technical University, 2022.