电渣重熔中的脱氧热力学

Deoxidation thermodynamics in electroslag remelting process

为了研究电渣重熔的脱氧制度,基于熔渣的离子分子共存理论,以模具钢和脱氧剂铝为研究对象,根据渣-金反应中各组元的质量守恒定律和热力学平衡定律,构建了电渣重熔中的脱氧热力学模型。模型结合试验得到了钢中各个合金元素的热力学平衡质量分数随脱氧剂铝添加量的变化关系,并依据模具钢的合金成分要求对脱氧剂铝的添加量进行了分析。结果表明,钢中硅、铝、锰和渣中氧化铝的平衡质量分数随着脱氧剂铝的增加呈升高的趋势,而渣中氧化硅、氧化铁、氧化锰呈降低趋势;考虑到模具钢中各个合金元素的成分要求,脱氧剂铝的添加量不宜超过1.7kg/t(钢)。

In order to investigate the deoxidation during electroslag remelting process,a thermodynamics model for the deoxidation in Cr5 system with Al as a deoxidizer was developed based on the ion and molecule coexistence theory(IMCT),the thermodynamics equilibrium and the mass conservation law.The equilibrium mass percent of Si,Al,Mn in the steel were obtained depending on the increasing mass percent of Al,which provided a theoretical basis to control the Al addition based on the variation curves of mass percent of Si,Al,Mn in the steel and the composition required by the certain steel.The result shows that the mass percent of Si,Al,Mn and Al2O3 increase with the mass percent of Al increasing,while the mass percent of SiO2,FeO and MnO tend to decrease.Considering the limitation of Si,Al,Mn mass percent,the amount of Al added in the steel should not exceed 0.17%of the steel.