Abstract
A phenomenon has been observed that the magnetic transformation temperature of high chromium-iron alloys aged at around 600°C shifts to a higher temperature than that of the as-solution treated alloy. To clarify the relation of this phenomenon with the 475°C embrittlement, the changes of the magnetic transformation temperature, hardness and microstracture of high-purity high chromium-iron alloys (47 wt% Cr, 52 wt% Cr and 57 wt% Cr) on aging at 475, 550, 600, 650 and 700°C were studied. The results obtained are as follows:(1) The magnetic transformation temperature of iron-chromium alloy on aging at 600 and 650°C shifts to a higher temperature than that of the as-solution treated alloy.(2) The reason for the fact (1) is not directly related to the precipitation and resolution of chromium compounds such as chromium carbide and nitride, and 475°C embrittlement (or a spinodal decomposition).(3) The anomaly that suggest the spinodal decomposition was observed in thermal magnetic analysis curves in alloys aged at 550°C for 50 hr and more.
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