Study of austenite grain size of microalloyed steel by simulating initial solidification during continuous casting
Study of austenite grain size of microalloyed steel by simulating initial solidification during continuous casting
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模拟连铸初始凝固研究微合金钢奥氏体晶粒尺寸
DOI：
10.1179/1743281214y.0000000197
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发表时间：
2015-01-01
影响因子：
2.1
通讯作者：
Tang, P.
中科院分区：
文献类型：
--
作者：
Li, Y.;Wen, G.;Tang, P.
利用共聚焦激光扫描显微镜模拟了微合金钢在连铸过程中的奥氏体晶粒长大行为，分析了凝固冷却速度、奥氏体晶粒长大起始温度T γ和钢成分对奥氏体晶粒长大行为的影响。其次，对Bernhard模型提出的奥氏体晶粒尺寸预测模型进行了修正。结果表明，通过实验室模拟连铸初始凝固过程，在冷却速度为1.5 ~ 2.5 ℃·s（-1）时，获得了铸坯表面奥氏体晶粒尺寸，用当量碳含量C-P计算T γ，T γ与当量碳含量C-P呈指数函数关系;描述微合金元素对奥氏体晶粒尺寸影响的修正因子K与P-Ti呈指数函数关系（钛的沉淀量）;用T-γ和K值对Bernhard模型进行修正，修正模型的计算值与实测值吻合较好。
The austenite grain growth behaviour of microalloyed steel during continuous casting was simulated by confocal laser scanning microscope, and the effect of the cooling rate during the solidification, T-gamma (the starting temperature for austenite grain growth) and steel composition on the behaviour of austenite grain growth were analysed. Next, the model for predicting the austenite grain size, which is put forward by the Bernhard model, was revised. The results show that by the lab simulation of continuous casting initial solidification process at the cooling rate between 1.5 and 2.5 degrees C s(-1), the austenite grain size lying within the size range on the slab surface was obtained; T-gamma was calculated using equivalent carbon content C-P and showed the exponential function relation to the latter; the revision factor K, describing the effect of microalloyed elements on austenite grain sizes, showed exponential function relation with P-Ti (precipitation amount of titanium); both T-gamma and K were used to revise the Bernhard model, and the calculated value by the revision model closely corresponds to the measured values.