Fe-C 공정 온도 고정점의 용융 특성에 대한 연구
Study on the melting characteristics of the Fe-Ceutectic temperature fixed-point
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Abstract
A Fe-C eutectic cell for thermocouple calibration was manufactured and tested to investigate its phase transition characteristics in the thermocouple thermometry. It was observed that the freezing plateaus were strongly affected by the freeze-inducing temperature Tf. In case of the melting process, the melting plateau was influenced by the previous thermal history. As Tf in the previous freezing was lower, the melting plateau became lower with a temperature dependence as small as 0.0015oC/oC. Therefore, it was found that the freeze-inducing temperature should be fixed to obtain a reproducible phase transition temperature in the melting. After fixing Tf, the melting process was examined and it was found that long and flat melting plateau was obtained within a reproducibility of about 0.01oC. Based on the observed results, it was recommended that Fe-C eutectic temperature be best realized for the melting process with a melt-inducing temperature of +3oC above the expected liquidus temperature after freezing at 5oC below the solidus temperature.
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