Issue 50

Z.-y. Han et alii, Frattura ed Integrità Strutturale, 50 (2019) 21-28; DOI: 10.3221/IGF-ESIS.50.03 24 Figure 6: SEM images of the fracture surfaces of X80 steels in (a) in air, (b) 2.6 % DO, (c) 4.7 % DO, (d) 6.8 % DO Figure 7: Variation of the lateral morphology of the samples with testing time b 50 50 a quasi-cleavage zones c d 50 50 quasi-cleavage zones 25h 50h 100h 75h 25h 50h 100h 75h DO=2.6% DO=6.8%