Abstract: A coupled thermal-mechanical model including dynamic heat exchange between mold and bloom solidified shell is established by using Marc software, and the effect of radius of mold comer on thermo-mechanical behavior of bloom local shell and mold including temperature, stress and strain distribution has been analyzed. Results show that for bloom with cross section 280 mm x 380 mm the available radius of mold comer is 17. 5 ~ 20 mm, as the radius of mold corner is lower than that value the temperature gradient in local zone with 10 ~ 20 mm distance from bloom corner is larger that is unfavorable to homogeneously develop bloom shell； as the radius of mold corner is larger than that value, the greater contact normal force between mold and bloom shell leads to starlike cracks on strand.

摘要： 通过采用Marc软件建立包括结晶器与大方坯凝固坯壳之间动态热交换的热-力耦合模型,分析了结晶器圆角大小对铸坯和结晶器热-力学状态温度、应力和应变分布的影响。结果表明,对于280 mm×380 mm断面铸坯,结晶器圆角半径应选17.5～20 mm为宜,结晶器圆角半径过小,铸坯偏离角部10～20 mm区域表面温度波动较大,不利于坯壳均匀生长;结晶器角部半径过大,结晶器与坯壳之间在角部摩擦严重,易导致坯壳龟裂。