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.

这项研究解决了有关基于三维额叶细胞自动机（FCA）的计算机建模的某些方面的问题，以模拟专用设计的微合金奥氏体模型合金中超细晶粒（UFG）微观结构的发展，即FCC结构。在本研究模型中提出的步骤是朝着了解在严重塑性变形（SPD）过程中发生的变形和微观结构发展机制迈出的一步，而塑性变形效应在FCC结构中的累积量很高。由于SPD的影响，开发了分析的微合金奥氏体组织。使用建议的计算机模型，基于三维FCA，已经表明可以预测FCC微结构的一些特征，例如晶粒尺寸和边界取向差角的分布。通过建模和SEM / EBSD结果的定性和定量比较证明了这些能力。使用拉丝工艺的实验结果测试了所提出模型的功能。通过显微镜研究，提出了多级MaxStrain技术实验研究的新原始结果。基于这些研究获得的数据，以近似方程的形式获得了晶粒结构和取向差角的演变对累积应变和循环次数的依赖性。这些方程式已实施到CA模型中，并对MaxStrain技术进行了仿真。在实验研究和模拟中获得的结果的比较显示出令人满意的一致性。对开发模型的工业验证也显示出令人满意的协议。