钢在凝固过程液-固两相时高温蠕变行为的解析

目前，金属高温蠕变的研究主要聚焦于材料的服役阶段，金属凝固过程在液、固两相共存时的高温蠕变却很少被关注。虽然金属在液、固两相状态下无法稳定服役，但金属在制造成型时正常都会经历这个凝固阶段，此阶段的高温蠕变温度更高，变形速度更快，并且受到液相金属的静压力影响，具有独特的蠕变行为。本研究将在建立六种典型钢的高温物性数据库、高温蠕变数据库的基础上，针对钢在凝固过程的高温蠕变行为开展研究，利用基金委重大仪器专项基金开发的设备进行凝固过程的高温蠕变测试，探寻其蠕变行为的特征及影响要素，开发能描述金属凝固过程高温蠕变行为的数值仿真系统，定量解析其蠕变的热-力行为。

At present, the research on high temperature creep behavior of metal is primarily focused on material service stage, while the creep behavior of metal at solid-liquid two-phase coexistence state during solidification process is rarely seen. Metal material in solid-liquid two-phase state cannot be stable for service，but solidification is an inevitable stage in the manufacturing process. The creep behavior in solid-liquid two-phase state is unique for its higher temperature, faster deformation rate and static pressure effect of liquid metal. Based on the high temperature property database and high temperature creep database of steel, this study will focus on the steel creep behavior during solidification process, and use the instrument developed by the ISIS to test creep behavior during the solidification process. The character of creep behavior and deformation mechanism would be analyzed, and the numerical simulation system would be developed for describing the metal creep behavior in solid-liquid two-phase state during solidification process.