Thermodynamic Study on Deoxidation Equilibrium of High Alloyed Steel

对高合金钢的需求，如基于铁镍的合金、铁合金和奥地利不锈钢钢，每年都会增加到先进电子材料市场的扩展。对于这种高纯度的合金钢的生产，这是必要的控制/或最小限度地减少钢产品在消除氧化过程中形成的非金属含量。在传统的低合金钢中，有一系列的调查被发现在氧化均衡器上。However，关于高合金钢中去氧化均衡的热动力学知识是相当贫乏的。目前工作的目标是在含有高合金钢的Ni and Co.，1995年，关于去氧化等价物的可靠热动力学信息。高锰钢中的锰Si-O中的equilibrium（20质量%锰）首次在温度范围内对MnO饱和度进行了1550 → C至1650 → C.发现了高Mn含量的equilibrium oxygen含量不能被使用预测报告的交互参数和热模态参数是根据目前的实验结果重新评估的。1996年，研究了铝、钙、镁和锆液体中的氧化当量。相互作用参数、去氧化产品和equilibrium常数被确定为温度的一个功能。尖晶石非金属包容性的相位稳定性（MgO·Al_2O_3），它是最有害的包容性之一，也是目前工作中预测的。

Demand for high alloyed steel such as Fe-Ni based alloy, ferrite-and austenite-stainless steel is increasing year by year due to the expansion of the market of advanced electronic materials. For the production of such high purity alloyed steel, it is necessary to control/or minimize non-metallic inclusion in steel products formed during the deoxidation process. A number of investigations have been done on the deoxidation equilibria in conventional low alloyed steel. However, thermodynamic knowledge on the deoxidation equilibria in high alloyed steel is very poor. The objective of the present work is to establish thermodynamic information on the deoxidation equilibria in high alloyed steel containing Ni and Co. In 1995, equilibrium among Mn-Si-O in high manganese steel (<20mass%Mn) was first investigated at MnO saturation in the temperature range from 1550ﾟC to 1650ﾟC.It was found that equilibrium oxygen content at high Mn content can not be predicted by using reported interaction parameter, and thermodynamic parameters were re-assessed based on the present experimental results. In 1996, deoxidation equilibria of Al, Ca, Mg, Zr in liquid Fe-Ni-Co alloys were studied. Interaction parameters, deoxidation products and equilibrium constants were determined as a function of temperature. Phase stability of spinel non-metallic inclusion (MgO・Al_2O_3), which is one of the most harmful inclusion, was also predicted in the present work.