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Cellular automaton modeling of semisolid microstructure formation

China Foundry 2010年第2期7卷 143-148页

作者： Li Qiang Yu Baoyi Zhang Huawen Li Runxia Wang Feng Xie Shuisheng Huang Guojie Wang Hao School of Material Science and Engineering Shenyang University of Technology Shenyang 110870 China State Key Laboratory for Fabrication and Processing of Non-ferrous Metals Beijing General Research Institute for Non-ferrous Metals Beijing 100088 China Faculty of Surveying and Engineering University of Southern Queensland Queensland Australia 4350

Computer modeling of semi-solid structure formation is of significance in both understanding the mechanisms of globular structure formation and determining the effect of solidification conditions on final microstructure.A modified cellular automaton(mCA) model has been developed,which is coupled with macroscopic models for heat transfer calculation and microscopic models for nucleation and grain *** mCA model is applied to A356 Al alloy-one of the most widely used semi-solid alloys,to predict grain morphology and grain size during semi-solid solidification,and determines the effects of pouring temperature on the final *** modeling results show that the lower the initial temperature,the finer grain size will be *** addition,the model can be used to predict the solutal micro-segregation.

关键词： semi-solid metal processing microstructure modeling modified cellular automaton A356 Al alloy

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Probabilistic Property modeling for Reliable Casting Design and Production

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INTERNATIONAL JOURNAL OF METALCASTING 2025年第2期19卷 1212-1227页

作者： Bramann, Horst Olofsson, Jakob Sturm, Joerg C. MAGMA Giessereitechnol GmbH Aachen Germany Jonkoping Univ Jonkoping Sweden Simonorus AB Jonkoping Sweden

A new methodology leverages virtual casting process simulations to predict the statistical distribution of local mechanical properties, based on computed local microstructures and defects. The extensive result sets generated from each simulation can be statistically evaluated in a manner similar to numerous individual tensile tests. By incorporating process variability into the simulation, this innovative approach enables probabilistic modeling of expected local properties. Consequently, this method supports designers during the design phase for reliable component development and assists casters in achieving robust process designs.

关键词： probabilistic modeling casting process simulation process variability microstructure modeling tensile properties robust component design

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Advances in computational modeling of microstructure evolution in solidification of aluminum alloys

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Symposium on Simulation of Aluminum Shape Casting Processing - From Alloy Design to Mechanical Properties

作者： Zhu, M. F. Hong, C. P. Stefanescu, D. M. Chang, Y. A. Southeast Univ Dept Mat Sci & Engn Nanjing 210096 Peoples R China

ISBN: (纸本)0873396243

In the past decade, extensive efforts had been dedicated to explore simulation models of microstructure formation during solidification of alloys. Numerical simulation of microstructure evolution can provide us the information for predicting and controlling solidification microstructures, and also the information for improving the fundamental understanding of solidification mechanisms. This paper gives an overview of cellular automaton based models and of the derived front tracking model for the simulation of meso- and micro-scale microstructure evolution during solidification of aluminum alloys. The main achievements in this field are presented by examples encompassing a wide variety of problems including dendritic growth in binary and ternary alloys, dendritic growth with melt convection, and eutectic solidification. A particular emphasis is made on the quantitative aspects of simulations.

关键词： microstructure modeling solidification aluminum alloys cellular automaton front tracking

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Mathematical modeling of microstructure Evolution of V Steels during Hot Rolling of Seamless Tubes

Mathematical Modeling of Microstructure Evolution of V Steel...

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6th International Conference on Processing and Manufacturing of Advanced Materials (THERMEC)/2nd Symposium Session on Multiscale Mechanical Modelling of Complex Materials and Engineering Applications

作者： Carvalho, R. N. Ferreira, M. A. C. Santos, D. B. Barbosa, R. V&M Brasil Qual & R&D Mandrel Mill Dept Av Olinto Meireles 65 BR-3064010 Belo Horizonte MG Brazil Univ Fed Minas Gerais Dept Met & Mat Engn BR-30160030 Belo Horizonte MG Brazil

ISBN: (纸本)0878492941

Torsion and compression testing have been used to simulate microstructure evolution of industry processes. Additionally, mathematical modeling of the industry hot rolling processes has been carried out by several researchers. These models employed equations published in the literature describing kinetics of softening, grain size evolution and grain growth. Validation of the models was carried, in some cases, by comparing the microstructure or the average stress per pass, the latter as calculated from industry rolling mill loads In the present work, torsion simulation and industry trial results were used to validate the mathematical model presented. Equations used in the model were mostly taken from literature and appropriate modifications were implemented concerning basically two points: a) the transfer time between CMM and SRM, a step in the production line typical for seamless rolling and rather unusual for other industry rolling processes and b) the chemical composition used in tube rolling industry where C equivalent values are usually higher than those used in the rolling of flats.

关键词： Hot torsion tests Seamless tube rolling microstructure modeling

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modeling of microstructure evolution in additive manufacturing processes of Ti6Al4V

Modeling of microstructure evolution in additive manufacturi...

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2017 Simulation for Additive Manufacturing, Sinam 2017

作者： Salsi, Emilio Chiumenti, Michele Cervera, Miguel Universidad Politécnica de Cataluña UPC Modulo C1 Campus Norte C/Gran Capitán s/n Barcelona08034 Spain

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Coupled modeling of rafting behaviour in nickel-based single crystal superalloys

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International Journal of Mechanical Sciences 2025年

作者： Pin Lu Zixu Guo Xueling Fan Yilun Xu Yong-Wei Zhang Wentao Yan Xi'an Key Laboratory of Extreme Environment and Protection Technology School of Aerospace Engineering Xi’an Jiaotong University Xi’an 710049 China Department of Mechanical Engineering National University of Singapore Singapore 117575 Singapore Institute of High Performance Computing (IHPC) Agency for Science Technology and Research (A*STAR) 1 Fusionopolis Way #16-16 Connexis Singapore 138632 Republic of Singapore

Nickel-based single-crystal (NBSX) superalloys applied to turbine blades on advanced aero-engines, suffer from the creep degradation induced by microstructure evolution at high temperatures. Here, our experiments revealed a unique morphology change of γ' phase in NBSX superalloys during rafting, i.e. the fusion of adjacent γ' phase domains first appeared at both vertices of the vertical channel, rather than at the center of the channel. To comprehensively understand the mechanism of γ' phase domain evolution during creep, we integrate a cellular automata (CA) algorithm into a crystal plasticity finite element model (CPFEM) to simulate the evolution of γ' phase domains and creep deformation for NBSX superalloys. A microstructure evolution model is established to simultaneously capture the dissolution, coarsening, and rafting of γ' phase domains, which are implemented via a CA algorithm. The evolution rule of aluminum atomic equilibrium concentration driven by deformation energy, is introduced into the CPFEM-CA model to capture the unique γ' morphology evolution. The coupled model has been validated against experimental rafting data of NBSX superalloys. The results indicate that the observed unique rafting morphology is related to the element diffusion driven by deformation energy and leads to local stress concentration. The proposed CPFEM-CA model not only enhances the fundamental understanding of the γ' rafting behavior in NBSX superalloys, but also provides a powerful simulation tool for the creep behavior of γ'-strengthened superalloys.

关键词： Single crystals Creep Rafting microstructure modeling Crystal plasticity model Cellular automata

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Optimization of microstructure development: Application to hot metal extrusion

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JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE 1996年第6期5卷 743-752页

作者： Medina, EA Venugopal, S Frazier, WG Medeiros, S Mullins, WM Chaudhary, A Irwin, RD Srinivasan, R Malas, JC OHIO UNIV SCH ELECT ENGN & COMP SCIATHENSOH 45701 WRIGHT STATE UNIV DEPT MECH & MAT ENGNDAYTONOH 45435

A new process design method for controlling microstructure development during hot metal deformation processes is presented, This approach is based on modern control theory and involves state-space models for describing the material behavior and the mechanics of the process, The challenge of effectively controlling the values and distribution of important microstructural features can now be systematically formulated and solved in terms of an optimal control problem, This method has been applied to the optimization of grain size and certain process parameters such as die geometry profile and ram velocity during extrusion of plain carbon steel, Various case studies have been investigated, and experimental results show good agreement with those predicted in the design stage.

关键词： die design dynamic recrystallization extrusion microstructure modeling optimal control theory process design

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Computational analysis of temperature rises in microstructures of HMX-Estane PBXs

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COMPUTATIONAL MECHANICS 2013年第1期52卷 151-159页

作者： Barua, Ananda Zhou, Min Georgia Inst Technol George W Woodruff Sch Mech Engn Atlanta GA 30332 USA Georgia Inst Technol Sch Mat Sci & Engn Atlanta GA 30332 USA

The thermomechanical response of HMX/Estane, a polymer-bonded explosive (PBX) is analyzed for initial temperatures between 210 and 300 K. The main objective of this analysis is to gain a better understanding of the concepts that lead to deformation and heating of energetic composites as they undergo mechanical and thermal processes subsequent to impact. A recently developed cohesive finite element method (CFEM) framework is used to study the microstructure-level response of PBX. The CFEM framework allows the contributions of individual constituents, fracture and frictional contact along failed crack surfaces to heating to be tracked and analyzed. Digitized micrographs of actual PBX materials are used. The issues studied include large deformation, thermomechanical coupling, failure in the forms of microcracks in both bulk constituents and along grain/matrix interfaces, and frictional heating. The focus is on the correlation between grain-level failure mechanisms and overall temperature rise in the PBX. The results are used to establish microstructure-response relations that can be used in the design of energetic composites.

关键词： Thermomechanical response Cohesive framework Contact Polymer-bonded explosives microstructure modeling

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Second harmonic generation microscopy, biaxial mechanical tests and fiber dispersion models in human skin biomechanics

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ACTA BIOMATERIALIA 2024年 185卷 266-280页

作者： Alberini, Riccardo Spagnoli, Andrea Sadeghinia, Mohammad Javad Skallerud, Bjorn Terzano, Michele Holzapfel, Gerhard A. Univ Parma Dept Engn & Architecture Parma Italy Norwegian Univ Sci & Technol NTNU Dept Struct Engn Trondheim Norway Graz Univ Technol Inst Biomech Graz Austria

Advanced numerical simulations of the mechanical behavior of human skin require thorough calibration of the material's constitutive models based on experimental ex vivo mechanical tests along with images of tissue microstructure for a variety of biomedical applications. In this work, a total of 14 human healthy skin samples and 4 additional scarred skin samples were experimentally analyzed to gain deep insights into the biomechanics of human skin. In particular, second harmonic generation (SHG) microscopy was used to extract detailed images of the distribution of collagen fibers, which were subsequently processed using a three-dimensional Fourier transform-based method recently proposed by the authors to quantify the distribution of fiber orientations. Mechanical tests under both biaxial and uniaxial loading were performed to calibrate the relevant mechanical parameters of two widely used constitutive models of soft fiber-reinforced biological tissues that account for non-symmetrical fiber dispersion. The calibration of the models allowed us to identify correlations between the mechanical parameters of the constitutive models considered. Statement of significance Constitutive models for soft collagenous tissues can accurately reproduce the complex nonlinear and anisotropic mechanical behavior of skin. However, a comprehensive analysis of both microstructural and mechanical parameters is still missing for human skin. In this study, these parameters are determined by combining biaxial mechanical tests and SHG stacks of collagen fibers on ex vivo healthy human skin samples. The constitutive parameters are provided for two widely used hyperelastic models and enable accurate characterization of skin mechanical behavior for advanced numerical simulations. (c) 2024 The Author(s). Published by Elsevier Ltd on behalf of Acta Materialia Inc. This is an open access article under the CC BY license ( http://***/licenses/by/4.0/ )

关键词： Second harmonic generation Planar biaxial test Human skin Collagen fibers Hyperelasticity microstructure modeling Fiber dispersion models

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Numerical investigation of the influence of rolling texture and microstructure on fatigue crack initiation in BCC polycrystals

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INTERNATIONAL JOURNAL OF FATIGUE 2018年 107卷 72-82页

作者： Briffod, Fabien Shiraiwa, Takayuki Enoki, Manabu Univ Tokyo Dept Mat Engn Bunkyo Ku 7-3-1 Hongo Tokyo 1138656 Japan

The study aims to investigate the influence of the grain morphology and rolling texture on the fatigue crack initiation in BCC polycrystals. Several 2D polycrystalline aggregates having different grain size and shape distributions are generated based on an anisotropic tessellation and an ellipse packing algorithm. Uniform and typical BCC rolled textures containing both the alpha and gamma fibers are considered for the crystallographic texture of the material. Finite element simulations using a crystal plasticity model are performed under cyclic uniaxial tension-compression condition. Twenty simulations are conducted for each type of microstructure in order to obtain significant statistical data. A critical plane fatigue indicator parameter (FIP) following the Tanaka-Mura model is applied to quantify the sensitivity of the microstructure against fatigue crack initiation. The distributions of relevant geometrical, crystallographic and mechanical quantities are analyzed. The effect of the grain size distribution, morphology and texture on the fatigue performance and scattering are discussed.

关键词： microstructure modeling Crystal plasticity Finite element analysis Fatigue crack initiation Fatigue indicator parameter

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