Inseok Yang and Yong-Gyoo Kim 2007 Metrologia 44 L10 doi:10.1088/0026-1394/44/2/N02
Inseok Yang and Yong-Gyoo Kim1
Show affiliationsThe eutectoid transition in the iron–carbon system around 730 °C has been tested as a potential fixed point for use in thermocouple thermometry. Using a heating rate ≤ 1.5 °C min−1, the α–γ transition showed a short, but repeatable, plateau with a repeatability of 0.07 °C. However, the γ–α transition only exhibited a small discontinuity in a plot of emf versus time. Although only preliminary results were obtained here, once the thermodynamic (or the ITS-90) temperature, as well as its uncertainty, is assigned to this eutectoid transition, then the hypereutectoid transition in the iron–carbon system is potentially very useful, in that this fixed point can be obtained additionally while realizing the iron–carbon eutectic point.
Issue 2 (April 2007)
Received 15 January 2007
Published 20 March 2007
Inseok Yang and Yong-Gyoo Kim 2007 Metrologia 44 L10
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