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The hot cracking of the continuous casting bullit is connected with its macrostructure and mechanical property burnt. The macrostructure and the mechanical property of 0. 13 wt- %C continuous casting bullit was investigated. The results are as follows: 1) the classical representation of the casting bullit shows three distinct zones, a peripherial region of small equiaxed grains, a columnar zone, and a central equiaxed zone. The rapid increase of the under cooling layer thickness is the criterion of the transformation from the columnar zone to central equiaxed zone; 2) The hardness decreases with the reducing of the solidification speed; 3) The tensile strength decreases gradually from the peripherial equiaxed maximum principal strain zone to central equiaxed zone ,and increases with the drop of the temperature. 相似文献
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连铸热工过程的数值模拟与热/力模拟研究 总被引:2,自引:1,他引:1
采用数值模拟方法计算连铸坯成形过程的温度场,将数值模拟与热/力 模拟方法相结合,分析力学性能随不同热工过程变化的动态演变过程。得到 无表面裂纹的铸坯表面温度模型为:表面温度为缓慢下降过程,并在低塑性 温区的上限温度900℃进行矫直。 相似文献
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