定向凝固Fe-Mn-C-Al系TWIP钢枝晶生长行为的研究  

RESEARCH ON DENDRITE GROWTH BEHAVIOR OF FE-MN-C-AL TWIP STEEL DURING DIRECTIONAL SOLIDIFICATION

作　　者：丁浩 刘建华 闫柏军[2] 刘洪波 申耀祖 

机构地区：[1]北京科技大学工程技术研究院 [2]北京科技大学冶金与生态工程学院

出　　处：《河南冶金》2017年第6期1-4,38,共5页Henan Metallurgy

摘　　要：采用定向凝固技术结合光学显微镜对Fe-Mn-C-Al系TWIP钢的枝晶生长行为进行了研究,通过建立不同的数学模型对生长速率为25μm/s、50μm/s、100μm/s定向凝固TWIP钢试样中的一次和二次枝晶臂间距进行了预测,并与实验结果进行了比较,结果发现,在实验速度范围内,实验用钢的凝固组织都为枝晶组织,并且随着抽拉速度的增加,枝晶被明显细化。3种一次枝晶臂间距模型的计算值与实验值的综合误差率分别是22.45%、35.64%、78.49%,其中Hunt模型预测效果最好。3种二次枝晶臂间距模型的计算值与实验值的综合误差率分别是8.27%、19.70%、41.94%,其中Masana Imagumbai模型可以准确的预测SDAS值。Research on dendrite arm spacing is of great importance for improving the mechanical properties of casting,while directional solidification technique and optical microscope are used to learn about the dendrite growth behavior of FeMn-C-Al TWIP steel. Various theory models about primary dendrite arm spacing(PDAS) and secondary dendrite arm spacing(SDAS) of TWIP steel were calculated in the present paper. The results show that the solidification structure of the Fe-Mn-C-Al TWIP steel is dendrite and the dendrite is obviously refined with increasing withdraw rates. The values of total errors rate calculated by three theory PDAS models and measured by experiments are 22.45%,35.64% and 78.49% respectively,while Hunt's model is the best of the three. Those of SDAS are 8.27%,19.70% and 41.94% respectively,while Masana Imagumbai's model can forecast the value of SDAS very well.

关 键 词：TWIP钢 枝晶间距 定向凝固 

分 类 号：TG142.1[一般工业技术—材料科学与工程]