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Development of Computer-Assisted System for Microstructural Design and Control of Steel

钢组织设计与控制计算机辅助系统的开发

基本信息

批准号：
08305029
负责人：
ISHIDA Kiyohito
金额：
$ 5.82万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

项目摘要

Computer-assisted system for microstructural design and control of steels has been developed, which is concerned with (i) construction of database of physical properties and (ii) computation al approach of kinetics of phase transformation. The results obtained are as follows.1. The database on phase diagrams of iron base alloys has been constructed. The related papers after 1990 are collected which combines with the previous compilations by ASM International. This information is available for world -wide database service on the Internet by the use of an object-oriented database system MOOD.2. The database on diffusion coefficient of iron base alloys has been constructed. The relation between diffusion coefficients and melting point is analyzed. This method is useful for the estimation of diffusion data where there is no experimental information.3. The databease on the surface energy and viscosity of liquid phase in iron alloys has been constructed. The computational method of estimating surface energy is also presented.4. The interaction between C and alloying elements in ferrite is evaluated and it strongly affects the creep strength of carbon steels.5. Phase decomposition is predicted by computer simulation based on non-linear diffusion equation.6. Effect of magnetic and chemical ordering on phase equilibria is clarified. It is shown that the interaction between magnetic and chemical ordering significantly affects the phase stability.7. Solute drag effect is quantitatively analyzed when the grain boundary is moving.8. The relation between mean grain radii and volume fractions of alpha and beta phases of dual-phase is established.

开发了钢的显微组织设计与控制的计算机辅助系统，它涉及(1)物理性能数据库的建立和(2)相变动力学的计算方法。取得的结果如下：1.研究结果。建立了铁基合金相图数据库。收集了1990年后的相关论文，并结合ASM International以前的汇编进行了整理。这些信息可通过使用面向对象的数据库系统MOOD2在因特网上提供世界范围的数据库服务。建立了铁基合金扩散系数数据库。分析了扩散系数与熔点的关系。这种方法对于没有实验信息的扩散数据的估计是有用的。建立了铁合金中液态相表面能和粘度数据库。给出了估算表面能的计算方法。研究了铁素体中碳与合金元素的相互作用，认为它对碳钢的蠕变强度有很大的影响。以非线性扩散方程为基础，通过计算机模拟对相分解进行预测。阐明了磁性和化学有序性对相平衡的影响。结果表明，磁有序和化学有序之间的相互作用对相稳定性有显著影响。定量分析了晶界移动时的溶质拖曳效应。建立了双相α、β相的平均颗粒半径与体积分数之间的关系。