Abstract
Eleven steel grades were designed to be used as metallic interconnects for Solid Oxide Fuel Cells (SOFC). Low carbon, high chromium steel with different additives of niobium, vanadium, aluminum, molybdenum, silicon, manganese and titanium were produced. Phase transformation temperatures; eutectoid temperature (Ac1) and temperature at which transformation of ferrite to austenite is completed during heating (Ac3) were measured by L75-76 dilatometer. The influence of the alloying elements on transformation temperatures was analyzed using MATLab. Considering the interaction between different alloying elements two equations for predicting Ac1 & Ac3 were obtained. The obtained Ac1 & Ac3 by these equations showed more compatibility than that obtained by traditional ones. In addition, the coefficients of thermal expansion of these steel grades were detected. The influences of chemical composition and temperature on the thermal expansion coefficient were analyzed; the obtained equations were verified to certain extent by using several kinds of steels. The predicted values were in good accordance with the experimental results which proof the validation of calculation model.
Highlights
Recent research results have enabled to decrease the operating temperature of the Solid Oxide Fuel Cells (SOFCs) from 1000 ̊C to 800 ̊C [1]
Eleven steel grades were designed to be used as metallic interconnects for Solid Oxide Fuel Cells (SOFC)
Phase transformation temperatures; eutectoid temperature (Ac1) and temperature at which transformation of ferrite to austenite is completed during heating (Ac3) were measured by L75-76 dilatometer
Summary
Recent research results have enabled to decrease the operating temperature of the Solid Oxide Fuel Cells (SOFCs) from 1000 ̊C to 800 ̊C [1]. The influences of chemical composition on transformation temperatures have been studied since the 1960s and several equations suitable for different situations were deduced by analyzing the corresponding data of hundreds types of steels [25] [26] [27], these classic equations were not high precise and not effective, as these analyses were too general and many types of steels were involved As these analyses were mainly multiple linear regressions, the interactions of the alloying elements were seldom considered.
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