高合金特殊钢立式连铸坯热应力及组织模拟研究

项目名称： 高合金特殊钢立式连铸坯热应力及组织模拟研究

项目编号： No.51474143

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 矿业工程

项目作者： 张捷宇

作者单位： 上海大学

项目金额： 88万元

中文摘要： 立式连铸是生产高合金钢的主要生产工艺，但由于技术封锁，我国仍处于工艺摸索阶段，且目前生产线一直存在着成材率低及铸坯裂纹等严重缺陷。基于此，本项目以减少立式连铸高合金特殊钢板坯缺陷为目标，把整个全连铸坯做为研究对象，建立三维模型，采用商业软件与自编软件相结合的方式，充分考虑钢液流动对温度场及坯壳生长的扰动，在此基础上对连铸中间包内冶金、结晶器及二冷区控制、连铸工艺优化和凝固末端电磁搅拌等几个方面开展研究，以期得出铸坯应力分布及组织生长情况对铸坯缺陷的影响。通过系统分析实验模拟、热模拟及现场采样研究结果，评估不同工况条件下铸坯质量，优化得出合理的冷却制度及连铸工艺参数，提高高合金特殊钢立式连铸产品成材率，提升我国重大战略材料的供应能力。

中文关键词： 连铸；数值模拟；凝固组织；热应力；热裂纹

英文摘要： Vertical continuous casting is the main process to produce high-alloy steel. However, due to the rigorous technical blockade, China is still in the exploratory stage, and the current production line has been seriously persecuted by lower product rate and slab cracks. In order to reduce the defects of vertical continuous casting slab in the high-alloy special steel, the whole slab is established as the research object. And the commercial software and self develop software are used to analyze the influence of the liquid steel flow and the temperature varying on the thickness of the shell. Based on these data, systematically research the the tundish metallurgy, mold and secondary cooling zone control,casting solidification process optimization and electromagnetic stirring, etc.,and expect to get the situation of thermal stress and microstructure growth affect on the slab defects.By analyzing the experimental simulation systems, thermal simulation and field sampling results to assess the quality of the slab under different conditions, and optimized cooling system to get a reasonable continuous casting process parameters to reduce the thermal cracks of the invertical continuous casting of special high-alloy steel slab.

英文关键词： Continuous casting;Simulation;Solidification microstructure;Thermal stress;Thermal cracks