Sensitivity to dynamic strain aging of carbon–manganese steels measured by ultrasonic fatigue testing
Source abstract
Abstract
Abstract Some carbon–manganese (C–Mn) structural steels are known to be sensitive to aging under deformation between 100 and 350°C, phenomenon called dynamic strain aging (DSA). This paper is aimed at studying the DSA sensitivity through the thermal response of C–Mn steels during ultrasonic fatigue tests. For this purpose, self‐heating tests are conducted on two C–Mn steel grades, extensively used in the nuclear industry. Tests are monitored by infrared thermography. DSA effect clearly appears on self‐heating curves by a singular temperature rise. The DSA occurrence is correlated with results from internal friction tests, in particular with the presence of the cold work peak. The temperature of 100°C related to the start of the thermally activated DSA phenomenon is retrieved by self‐heating tests. Based on a further intrinsic dissipation computation, DSA distinctly differs from the classical dislocation glide mechanism. Furthermore, a stress threshold of irreversibility is shown to emerge.
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Research context
OpenAlex topics: Fire effects on concrete materials · Microstructure and Mechanical Properties of Steels · Fatigue and fracture mechanics
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
LEME Laboratory Paris Nanterre University Ville d'Avray France
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