IFIR 05409
INSTITUTO DE FISICA DE ROSARIO
Unidad Ejecutora - UE
artículos
Título:
On the cyclic softening mechanisms of reduced activity ferritic/martensitic steels
Autor/es:
MARIA FLORENCIA GIORDANA; IRIS ALVAREZ-ARMAS; ALBERTO ARMAS
Revista:
STEEL RESEARCH INTERNATIONAL
Editorial:
VERLAG STAHLEISEN MBH
Referencias:
Lugar: Weinheim; Año: 2012 vol. 83 p. 594 - 599
ISSN:
1611-3683
Resumen:
Low cycle fatigue tests were performed in the temperature range between room temperature and 550°C in quenched and tempered ferritic/martensitic steels. After the first few cycles a cyclic softening that continues up to failure is observed for all these steels. The rate of softening increases with temperature being very pronounced at temperatures above 500ºC. The evolution of the flow stress during cycling was studied by analyzing the back and friction stresses obtained from the hysteresis loops measured along the entire test. From the analysis of the hysteresis loops and confirmed by electron microscopy observations it can be concluded that the strong cyclic softening observed is produced by the softening exhibited by both stresses. However, the importance of each of these stresses on the softening depends on temperature.
