INVESTIGADORES
STRUBBIA Renata
artículos
Título:
EXPERIMENTAL CHARACTERIZATION OF SHORT CRACK NUCLEATION AND GROWTH DURING CYCLING IN LEAN DUPLEX STAINLESS STEELS
Autor/es:
R. STRUBBIA; S. HEREÑÚ; A. GIERTLER; I. ALVAREZ-ARMAS; U. KRUPP
Revista:
INTERNATIONAL JOURNAL OF FATIGUE
Editorial:
ELSEVIER SCI LTD
Referencias:
Lugar: Amsterdam; Año: 2014 vol. 65 p. 58 - 63
ISSN:
0142-1123
Resumen:
Considering that many applications of Lean Duplex Stainless Steels (LDSSs) involve cyclic loading, the aim of this paper is to study short crack initiation and growth during low (LCF) and high cycle fatigue (HCF) in AL 2003 (UNS S32003). Electron Backscattered Diffraction (EBSD) analysis of plastically active grains allows to determinate the slip systems and their associated Schmid factor (SF). Additionally, the dislocation structure developed during cycling is observed by transmission electron microscopy (TEM). Whereas in HCF cracks nucleate at grains boundaries, during LCF cracks nucleate along intrusion/extrusions in ferritic grains and as they reach austenitic grains grow along active slip systems or by double slip system. Moreover, phase boundaries and grain boundaries act as effective barrier against crack propagation.
