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microstructural modeling and Multiscale Mechanical Properties Analysis of Cancellous Bone

Computers, Materials & Continua 2020年第1期62卷 245-265页

作者： Zhiqiang Huang Yufeng Nie Yiqiang Li Research Center for Computational Science Northwestern Polytechnical UniversityXi’an710072China School of Applied Science Taiyuan University of Science and TechnologyTaiyuan030024China

This paper is devoted to the microstructure geometric modeling and mechanical properties computation of cancellous *** microstructure of the cancellous bone determines its mechanical properties and a precise geometric modeling of this structure is important to predict the material *** on the microscopic observation,a new microstructural unit cell model is established by introducing the Schwarz surface in this *** this model is very close to the real microstructure and satisfies the main biological characteristics of cancellous *** using the unit cell model,the multiscale analysis method is newly applied to predict the mechanical properties of cancellous *** effective stiffness parameters are calculated by the up-scaling multi-scale *** the distribution of microscopic stress in cancellous bone is determined through the down-scaling *** addition,the effect of porosity on the stiffness parameters is also *** predictive mechanical properties are in good agreement with the available experimental results,which verifies the applicability of the proposed unit cell model and the validness of the multiscale analysis method to predict the mechanical properties of cancellous bone.

关键词： Cancellous bone microstructural modeling multiscale analysis stiffness parameters stress distribution

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Micro-scale Cellular Automaton modeling of Interface Evolution During Reaustenitization from Pearlite Structure in Steels

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Acta Metallurgica Sinica(English Letters) 2018年第7期31卷 713-722页

作者： Gang Shen Cheng-Wu Zheng Jian-Feng Gu Dian-Zhong Li Institute of Materials Modification and Modelling School of Materials Science and Engineering Shanghai Jiao Tong University Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Materials Genome Initiative Center Shanghai Jiao Tong University Shanghai Key Laboratory of Materials Laser Processing and Modification Shanghai Jiao Tong University

A modified cellular automaton model is developed to depict the interface evolution inside the cementite plus ferrite lamellar microstructures during the reaustenitization of a pearlite steel. In this model, migrations of both the austenite- ferrite and austenite-cementite interfaces coupled with the carbon diffusion and redistribution are integrated. The capil- laxity effect derived from local interface curvatures is also carefully considered by involving the concentration given by the phase diagram modified by the Gibbs-Thomson effect. This allows the interface evolution from a transient state to a steady state under different annealing conditions and various interlamellar spacings to be simulated. The proposed cellular automaton approach could be readily used to describe the kinetics of austenite formation from the lamellar pearlites and virtually reveal the kinematics of the moving interfaces from the microstructural aspect.

关键词： Austenite formation Lamellar pearlite Interface evolution Cellular automaton microstructural modeling

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Avoidance of microstructural Heterogeneities by Hot Rolling Design in Thin Slab Direct Rolled Niobium Microalloyed Steels

Avoidance of Microstructural Heterogeneities by Hot Rolling ...

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技术创新与循环经济——第二届宝钢学术年会

作者： P. URANGA B. LOPEZ J.M. RODRIGUEZ-IBABE CEIT and Tecnun（Univ.of Navarra） Manuel de Lardizabal 1520018 Donostia- San SebastianBasque CountrySpain

＜正＞The microstructural evolution during hot rolling of a 0.05%Nb microalloyed steel is modeled considering all the microstructural reactions that can take place during an industrial TSDR *** on the results obtained from the model,processing maps are drawn and optimum processing conditions defined for each finishing gauge *** the difficulties present in the production of thick hot strip,several alternative thermomechanical schedules are proposed,which would originate microstructures with a suitable combination of homogeneity and retained strain prior to transformation.

关键词： Thin Slab Direct Rolling Nb microalloyed steels microstructural heterogeneities microstructural modeling austenite as - cast structure

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