Abstract
This study addresses some aspects regarding a computer modelling based on three-dimensional Frontal Cellular Automata (FCA) for the simulation of ultrafine-grained (UFG) microstructure development in purpose-designed microalloyed austenite model alloy i.e. FCC structure. Proposed in the present study model is a step forward towards understanding the deformation and microstructure development mechanisms occurring during severe plastic deformation (SPD) processes with high accumulation of the plastic deformation effects in FCC structures. The analysed microalloyed austenite microstructures were developed due to SPD effects. Using the proposed computer model, based on three-dimensional FCA it has been shown that it is possible to predict some characteristics of the FCC microstructures such as the grain size and the distribution of the boundaries misorientation angle. These abilities were proved by the qualitative and quantitative comparisons of the modelling and SEM/EBSD results. The capabilities of the proposed model were tested using experimental results of the wire drawing processes. The paper presents the new original results of experimental studies of multi-staged MaxStrain technology with the microscopic investigation. Basing on data obtained from these studies, the dependencies of the evolution of grain structure and misorientation angle on the accumulative strain and cycle number were obtained in a form of approximation equations. The equations were implemented into the CA model, and MaxStrain technology was simulated. Comparison of the results obtained in experimental studies and simulations shows a satisfactory agreement. Industrial verification of the developed model as well shows a satisfactory agreement.
Highlights
The combined effect of the complex chemical composition and grain refinement determines the formation of the microstructure, which controls the mechanical properties of modern structural materials
An analysis fulfilled in that work showed that separation of structural elements (SE) on dislocation cells, subgrains and grains as well as boundaries between them on HABs, LABs and boundaries with
It was proposed to unite dislocation cells, subgrains and grains into a common group named structural elements, they can be described in the same simple consequent way with one main spatial variable—crystallographic orientation, the same for the whole structural element
Summary
The combined effect of the complex chemical composition and grain refinement determines the formation of the microstructure, which controls the mechanical properties of modern structural materials. Various kinds of micro- and nano-structures can be produced by Severe Plastic Deformation (SPD) processing. In these processes, metallic materials are subjected to heavy plastic deformation, at least up to an Different modelling methods can be applied for the study of microstructure evolution during the thermal and forming processes. Analytical methods are still used as a fundamental basis for grain refinement modelling of as presented by Petryk and Stupkiewicz [7] who proposed physically based analytical modelling approach for prediction of cell structure evolution during severe plastic deformation. Muszka et al [8] combined physically based modelling approach with finite element method to predict mechanical response of ultrafine-grained structures subjected to dynamic loading conditions. Authors summarize the progress in grain refinement methods and discuss progress in constitutive modeling of SPD effects on microstructure development
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
