摘要
基于Clyne-Kurz的微观偏析公式,以物理试验结果为依据,充分考虑固、液相以及夹杂物之间相互作用,建立第3代汽车钢(TG钢)凝固过程微观偏析耦合模型,研究凝固过程钢液中溶质元素和Al2O3等夹杂物分子的质量分数变化特征。结果表明:在整个凝固过程中,Al2O3分子会不断在液相中生成,但生成量比较少,而SiO2和MnO分子不会在液相中生成;铸坯枝晶间不仅有Al2O3夹杂,还有SiO2和其他复合夹杂,凝固前钢水中夹杂物有待进一步去除;凝固末期液相中MnS析出,大大减小了残余液相中S的质量分数变化,但对Mn的质量分数变化没有明显影响;包晶反应温度为1 487℃,包晶反应后凝固的固相中溶质的质量分数明显高于包晶反应前。
Based on the Clyne-Kurz microsegregation equation and the results of physical experiments, a coupled model of microsegregation during solidification process of the 3rd generation automobile sheet steel（TG steel）is established by adequately considering the interaction among liquid phase, solid phase and inclusions. The variations of the concentrations of various solute and inclusions molecules such as A12 O3 in molten steel during solidification process have been investigated. Results show that A12 O3 molecules continuously generate during solidification process, but the total mass of generated A12O3 molecules is relatively small, and SiO2 and MnO molecules have not generated in molten steel. Not only A12O3 inclusions but also SiO2 and other complex inclusions located in the dendritic crystals of billets were observed. It is seen that the inclusions in molten steel before solidification need to be further removed. MnS molecules generate at the end of solidification, it has diminished the change of sulfur concentration in the residual steel, but has no significant effect on the change of manganese concentration. The temperature of peritectic reaction is 1 487 ℃. The concentrations of solute in the solid formed after the peritectic reaction is significantly higher than those before the peritectic reaction.
出处
《钢铁研究》
CAS
2014年第2期29-33,共5页
Research on Iron and Steel
基金
国家重点基础研究发展计划(973)2010CB630806-2
关键词
第3代汽车钢
凝固
微观偏析
夹杂物
the 3rd generation automobile sheet steel~ solidification~ microsegregationinclusion
