Thermo-mechanical Simulation of Solidification Process of Molton Steel for the Development of Thin-strip-casting Method and Its Verification.

为了使双辊铸轧过程的计算方法形式化，从热力学的观点出发，编制了铸坯温度场和应力场的有限元程序。利用新开发的模型装置，对分析结果与实验数据进行了比较和讨论。研究结果如下：（1）铸坯凝固过程中的吸热分析。建立了考虑凝固生热的热传导方程，并进行了有限元计算。本文是在稳态条件下进行的分析，并考虑了材料前向的影响。研究结果为铸造工艺提供了合理的条件。(2)用非弹性本构关系进行应力和变形分析。在此基础上，分别采用弹塑性和弹粘塑性本构关系编制了有限元程序。引入实验得到的材料参数，发现后一关系式更适合于应力分析，特别是在熔化温度附近。（3）双辊铸轧系统的构建及分析结果的验证。用10kg的钼合金建造了100mm宽的板坯模型工厂，并实际生产了sab。利用安装在侧板上的10对热电偶进行了温度测量。实验结果表明，所采用的解析方法和基本方程对双辊铸轧的实际过程是适用的。

Finite element programs for temperature amd stress distributions in casting slab were developed from the viewpoint of thermo-mechanics in order to formalize the metholodogy of twin-roll casting process. By using the model plant newly developed, the evaluation of analytical results being compared with the experimental data was carried out with some discussions. The results obtained are as follows:(1) Heat consuction analysis in slab incorporated with solidification. Heat conduction equation with heat generation due to solidification was formulated, and finite elment implementation was made. Here, the analytical was made under steady state, and effect of material forw is also considerd. The results suggest to give the proper comditions for casting processes.(2) Stress and deformation analysis by use of imelastic constitutive relations. Based on the temperature distribution obtained above, finite element programs were debeloped by using elasto-plastic and elasto-viscoplastic constitutive relations. Introducing the matreial parameters obtained by experiments, the latter relation is found to be more adequate for the stress analysis, especially in the region near melting temperature.(3)Construction of twin-roll casting system and verification of analytical results. Model plant was constructed with the slab width of 100mm from 10kg molton metal, and sabs were actually produced. Temperature measurements by 10set of thermocouples equiped at side plate were carried out. The results of exsults of experiments show that the analytical method as well as fundamental equation employed were properly adaptive for actual process of the twin-roll casting.