Development of Texture Prediction Technique for Structural Control and High Quality Characteristics of Metallic Materials

金属材料结构控制和高质量特性的织构预测技术的发展

• 批准号: 12450292
• 负责人: SEKINE Kazuyoshi
• 金额: $ 6.78万
• 依托单位: Yokohama National University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12450292/
• 关键词: texture control; high quality characteristics; deformation texture; polycrystal plasticity; vector space method; ODF; strain heterogeneity; 高性能化; 集合組織; 結晶回転; 多結晶型性

Many macroscopic properties of metallic materials depend significantly on the orientation distribution in polycrystalline aggregate, so called "crystallographic textures". The present study has been designed to develop the quantitative prediction method and the PC calculation system for deformation texture evolution in the case that the initial texture is given as the representation of ODF. In this study, in particular, the microscopic strain heterogeneity near the grain boundaries, which has an important effect on the deformation texture evolution, is taken into consideration for the calculation of lattice rotation in each crystal.First, we have made the formulation of new crystal plasticity theory, in which the active slip rates and resultant lattice spin in a particular crystallite can be determined uniquely for rate-independent crystals, based on "the vector space method". We further have done the modeling of deformation texture using the new calculation scheme considering strain heterogeneous field due to the grain-to-grain interaction. As the results, the mathematical algorithm and computational procedure have been successfully developed for the deformation texture prediction. Finally, this computational procedure has been applied for the evolution of rolling texture of Al-alloy and IF-steel sheets. The predicted results were reasonable agreements with the experimental ones. Also, the implementations of our proposed computational system are considered to be applicable to the texture control technique for high quality characteristics by means of deformation processing in metallic materials.

金属材料的许多宏观性能在很大程度上取决于多晶聚集体中的取向分布，即所谓的“晶体织构”。本研究旨在建立以初始织构作为ODF表征的变形织构演化的定量预测方法和PC计算系统。在本研究中，特别是在计算每个晶体中的晶格转动时，考虑了对形变织构演化有重要影响的晶界附近的微观应变不均匀性。首先，我们建立了新的晶体塑性理论的公式，其中对于速率无关晶体可以唯一地确定特定微晶中的有效滑移速率和所得晶格自旋，基于“向量空间方法”。在此基础上，利用考虑晶粒间相互作用引起的应变非均匀场的新计算方案，对变形织构进行了模拟。研究结果表明，本文所提出的数学算法和计算程序是成功的。最后，该计算程序已被应用于铝合金和IF钢板材的轧制织构的演变。预测结果与实验结果吻合较好。此外，我们提出的计算系统的实现被认为是适用于高品质的特性，通过在金属材料的变形处理的纹理控制技术。