FATIGUE DAMAGE MICROMECHANISMSIN AN AUSTENITIC-FERRITIC STAINLESS STEEL

摘要

This paper presents an analysis method using an in-situ microscopy device to observe surface damage during fatigue tests inreal time.Surface observations were combined with displacement and strain field calculations by digital image correlation withprocedure CORRELICORRELILMT LMT.Resolution and accuracy of the measurement system were first evaluated.Analyses of displacementand strain fields were then performed on a low-cycle fatigue test on a duplex stainless steel.These analyses allow to measurelocal displacements and strains at the microstructural scale.Combined with surface observations by SEM, these analysesallow thus to highlight strain heterogeneities intra- and/or inter-grains and phases..