Construction of Materials Database on High Temperature Inelastic Behavior of Metallic Materials and the Application to Numerical Analyses

淬火、焊接、铸造等含有相变的工程过程的温度场、组织场和应力应变场的耦合模拟，需要大量的材料数据;导热系数和导热比热，CCT或TTT图，相变的温度-膨胀图，应力-应变本构关系，弹性常数，所有这些都取决于温度。本项目旨在与日本材料科学学会工程塑性委员会材料数据库小组委员会合作构建材料数据库，并评估其有效性和适用性。本文重点介绍了50多种热处理用钢，积累了以下材料数据，这些数据取自文献和实验; 5%应变下的应力-应变曲线、热导率、比热、弹性模量、CCT和TTT图、温度-延伸率图。基于MS-Excel的数据库工具采用层次结构设计，使用户易于访问，并将开发的数据库中的材料数据转换为MATEQ数据库，该数据库包含1000多种s-s曲线数据系列和50-100种其它性能数据系列，为今后开发更复杂的数据库奠定了基础。通过对几种相变过程的数值模拟，验证了数据库的有效性和对数值模拟的适用性。

Simulation to determine coupled fields of temperature, metallic structure and stress/strain in the course of engineering processes incorporating phase transformation, such as quenching, welding, casting and so on, needs so many material data ; thermal conductivity and specific heat for heat conduction, CCT or TTT diagram, temperature-dilatation chart for phase change, and Stress-strain constitutive relation, elastic constants, all of which depend on temperature. This project motivates the construction of a materials database cooperating with the activity of Subcommittee of Materials Database, Committee of Engineering Plasticity, the Society of Materials Science, Japan, and the evaluation of the validity and applicability to numerical simulation. More than 50 kinds of steel used for heat treatment are focused here to accumulate the following material data, which are taken from documents and experiments ; stress-strain curve under 5% strain, thermal conductivity, specific heat, elastic modulus, CCT and TTT diagram, temperature-elongation diagram. The database tool built on MS-Excel is designed in a hierarchical structure so that users can easily approach, and the material data in the developed database are converted to a database, MATEQ.This database contains more than 1000 kinds of data series for s-s curves and 50-100 for other properties, which triggers future development of more sophisticated database. The validity of the database and applicability to numerical simulation is also examined by simulating several kinds of processes with phase transformation.