Abstract
After the quenching of three iron-chromium alloys from 1100°C, the internal friction was studied as a function of the tempering temperature. Between room temperature and 400°C, internal-friction maxima appeared and the tempering behaviour was different depending on the chromium concentration. The chromium content of the three alloys was 2%, 12% and 17%, but for a given chromium concentration the alloy structure is determined by the carbon content. The effect of the carbon concentration was particularly studied for every alloy. In the case of the 17% chromium steel we have tried to relate the internal-friction measurements to the tensile tests: it seems that the carbide precipitation only decreases the serration effects on the tensile curves. For this alloy we believe that we have a relaxation effect or a precipitation process depending on the carbon content.
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