Tensile Properties in Fe-Si Steel in a Low Temperature Range

Abstract

In Fe-Si steel, the relationship between the micro-crack transition temperature, T_m and the temperature, T_V^*=0 at which the activation volume apparently equals zero in V^* vs T^1⁄2 curve, is discussed using tensile strain-rate controlled tests. The results obtained are as follows:
(1) V^* can be plotted as a function of the square root of temperature.
(2) The following equation between T_V^*=0 and T_m was obtained:
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T_m can be taken by the above equation, finding T_V^*=0 in a temperature range below 173°K where the fit cooling baths are a little difficult to be used.