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本文从理论上阐述了钢铁氧化、脱碳与自由能变化及温度之间的关系,以及如何运用自由能变化——温度关系图确定各种元素在不同温度下不发生氧化时,气氛的氧分压值。并通过 P_(O_2)~(1/2)、P_(H_2O)、P_(CO_2)的比例关系,确定氧分压实现炉气控制的可能性,以及 P_(O_2)的计算方法。不同钢材在不同温度加热时,必须保证炉气具有相应的各组分相对比值,才能完成光亮热处理过程,并通过氧探头氧势自动控制仪(YTT-1A 型)进行自动控制。本文还给出氧探头电势和标准自由能变化及氧分压之间关系图,并介绍了自制的试验设备、自动控制系统及其试验结果。最后叙述了氧探头氧势自动控制仪在光亮热处理中的应用。
In this paper, the relationship between the oxidation and decarburization and free energy change and temperature in steel is expounded in theory, and how to use the change of free energy - temperature relationship diagram to determine the oxygen content of the various elements under different temperatures without oxidation Pressure value. P2O5, P2O5, P2O5, P2O5, P2O5, P2O5, P2O5, P2O5, P2O5, P2O5, P2O5, P2O5 and P2O5 were calculated. Different steel heating at different temperatures, you must ensure that the furnace gas has the relative ratio of the various components in order to complete the bright heat treatment process, and oxygen probe oxygen automatic control device (YTT-1A type) for automatic control. This paper also gives the oxygen probe potential and standard free energy changes and the relationship between the partial pressure of oxygen, and introduces the self-made test equipment, automatic control system and its test results. Finally, the application of oxygen probe oxygen potential automatic controller in bright heat treatment is described.