Multiscale analysis of the effect of grain size on the dynamic behavior of microalloyed steels |

Issue		Volume 2, 2009 DYMAT 2009 - 9th International Conference on the Mechanical and Physical Behaviour of Materials under Dynamic Loading


Page(s)		1015 - 1021
Section		Micro-Structural Effects
DOI		10.1051/dymat/2009142
Published online		15 September 2009

DYMAT 2009 (2009) 1015-1021
DOI: 10.1051/dymat/2009142

Multiscale analysis of the effect of grain size on the dynamic behavior of microalloyed steels

A.K. Zurek¹, K. Muszka², J. Majta² and M. Wielgus²

¹ Los Alamos National Laboratory, MS G755, Los Alamos, NM87545, USA
² AGH – University of Science and Technology, Mickiewicza 30, 30-059 Krakow, Poland

Published online: 15 September 2009

Abstract
This study presents some aspects of multiscale analysis and modeling of variously structured materials' behavior in quasi-static and dynamic loading conditions. The investigation was performed for two different materials of common application: high strength microalloyed steel (HSLA, X65), and as a reference more ductile material, Ti-IF steel. The MaxStrain technique and one pass hot rolling processes were used to produce ultrafine-grained and coarse-grained materials. The efficiency and inhomogeneity of microstructure refinement were examined because of their important role in work hardening and the initiation and growth of fracture under tensile stresses. It is shown that the combination of microstructures characterized by their different features contributes to the dynamic behavior and final properties of the product. In particular, the role of solute segregation at grain boundaries as well as precipitation of carbonitrides in coarse and ultrafine-grained structures is assessed. The predicted mechanical response of ultrafine-grained structures, using modified KHL model is in reasonable agreement with the experiments. This is a result of proper representation of the role of dislocation structure and the grain boundary and their multiscale effects included in this model.

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