Influence of the carbon content on dislocation relaxation in martensitic steels

Mechanical-loss measurements were performed in three grades of martensitic high-carbon tool steels. These steels were treated under carburizing gas before quenching, in order to vary the concentration of interstitial carbon in the martensite, as assessed by thermoelectric-power measurements. The mechanical-loss spectra present a relaxation peak due to interaction between dislocations and carbon interstitials, similar to the Snoek-Koster peak found in ferrite. The amplitude of the Snoek-Koster peak is expected to be independent of the concentration of interstitials. However, the amplitude of the corresponding peak in martensite is found to increase with the concentration of interstitial carbon. This effect is attributed to an increase of the dislocation density with the carbon content. (C) 2009 Elsevier B.V. All rights reserved.

Published in:
Materials Science And Engineering A-Structural Materials Properties Microstructure And Processing, 521-22, 117-120
Presented at:
15th International Conference on Internal Friction and Mechanical Spectroscopy (ICIFMS-15), Perugia, ITALY, Jul 20-25, 2008

 Record created 2010-11-30, last modified 2018-03-17

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