Analysis of Thermo-mechanical Coupling in the Beam Blank Mould Based on Inherited Stress
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摘要: 针对异型坯连铸过程中出现较多表面裂纹的问题, 基于连铸坯壳应力遗传特性, 利用多载荷步法建立了结晶器内铸坯凝固热力耦合模型, 在考虑锥度和气隙的情况下, 分析了结晶器内坯壳的温度与受力变化过程。根据不同时刻的铸坯温度与力学特性找出了铸坯裂纹最易萌生扩展位置为R角, 且高度在结晶器中部。该研究对控制异型坯表面裂纹及提高铸坯质量提供了理论指导, 同时为异型坯表面裂纹扩展研究提供基础。Abstract: In order to control surface cracks in beam blank via continuous casting process,a thermo-mechanical coupling model considering the taper and air gap was established to compute the temperature and stress in the mold based on stress genetic characteristics of the slab shell and multiple load step way.From the modeling resultthe location where longitudinal surface cracks easily occurred is on the fillet at the central part of the mould.This finding will help to control longitudinal surface cracks initiation and growth.
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