On the Anomaly of the Specific Heat at High Temperatures in α Phase Alloys of Iron and Chromium

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The specific heats of 10 kinds of alloys consisting of iron and less than 55.57 per cent of chromium were measured at high temperatures in annealed, quenched and baked states by an inverse rate curve method. In the case of the alloys containing less than 24.31 per cent of chromium, the specific heat-temperature curves in the annealed state showed a maximum due to the magnetic transformation and an anomalous maximum at about 520° to 560° ; the temperatures of the former became lower and those of the latter higher with the increase of chromium content. In the alloys containing more than 28.58 per cent of chromium, both maxima combined in a maximum. The combined maximum was most conspicuous in the alloys containing 28.58 to 36.45 per cent of chromium, existing at about 570°, and when the chromium content was increased further, it became smaller and its temperature lower ; especially, the σ phase alloy containing 43.16 per cent of chromium showed a very small maximum. However, when the alloys were baked at 475° for 200 hours, these maxima became remarkably large and especially so in the σ phase alloy. When the alloys were quenched at 850°, the specific heat curves showed a minimum (heat evolution) at about 400 to 500° and a small maximum at higher temperature. From these results, it was concluded that the anomaly might be caused by the existence of the superstructure Fe_3Cr, which might also be the cause of the high temperature brittleness of the alloys.
東北大学の論文

On the Anomaly of the Specific Heat at High Temperatures in α Phase Alloys of Iron and Chromium

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