EBSD characterization of secondary microcracks in the heat affected zone of a X100 pipeline steel weld joint

In order to get better understanding of the mechanism of cleavage fracture in the heat affected zone (HAZ) of X100 pipeline steel, secondary microcracks underneath the brittle fracture surface of a Charpy impacted sample with the notch located in the HAZ were characterized using electron backscattered diffraction. Since the coarse grained (CG) HAZ and intercritically reheated coarse grained (ICCG) HAZ are well accepted as the weakest region in …