RT Journal Article
SR Electronic
A1 Rosenberg, Gejza
A1 Juhár, Ľuboš
T1 Fatigue resistance of dual phase steels in presence of microstructural inhomogeneities
JF Manufacturing Technology Journal
YR 2012
VO 12
IS 2
SP 217
OP 221
DO 10.21062/ujep/x.2012/a/1213-2489/MT/12/2/217
UL https://journalmt.com/artkey/mft-201202-0025.php
AB In the work, there are noted experimental results aimed at determination of influence of initial microstructure of the steel S355, that was exposed to different temperatures of intercritical annealing, on its resistance against cyclic loading by number of cycles needed to fracture the samples, loaded by stress amplitude σa = 500 MPa. Intercritical annealing at temperature ranging 740-840°C was carried out on a bar with the same thickness as the steel sheet in received state (B=9mm). Fatigue tests were realized on 1,2mm thick specimen cut from subsurface and middle area of initial thickness of the plate, where a banding structure occurred, thickness ∼1,5 mm in the received state. It was discovered, that samples with microstructural banding have higher fatigue resistance independently on temperature of intercritical annealing.