IFIR 05409
INSTITUTO DE FISICA DE ROSARIO
Unidad Ejecutora - UE
artículos
Título:
Microstructural changes in a duplex stainless steel during low cycle fatigue
Autor/es:
S. HEREÑU; I. ALVAREZ-ARMAS; A. ARMAS; S. DEGALLAIX; A. CONDÓ; F.LOVEY
Revista:
MATERIALPRUFUNG
Editorial:
BAM, DGZfP, DVM and VDI-W
Referencias:
Año: 2009 vol. 51 p. 359 - 364
ISSN:
0025-5300
Resumen:
Low cycle fatigue of SAF 2507 duplex stainless steel has been studied at different temperatures in two thermal conditions: unaged (as-received) and aged (100 hours at 475C). The corresponding cyclic flow stress components, the friction, and the back stresses, have been analyzed in relation to the observed microstructure. Friction stress attains higher values at room temperature than in the intermediate range of temperatures in both thermal conditions due to the influence of the lattice friction stress on screw dislocations in the ferrite phase.The cyclic softening observed at all temperatures in aged samples is caused by the decrease of the back stress. The increase of back stress in unaged samples at 300C is consistent with the high dislocation density observed in the ferrite phase ascribed as a typical manifestation of dynamic strain aging.
