This article is an atlas of fractographs that helps in understanding the causes and mechanisms of fracture of iron-base superalloys and in identifying and interpreting the morphology of fracture surfaces. The fractographs illustrate the neutron irradiation effect, fracture mode, fracture toughness, sulfidation corrosion failure, and interdendritic attack of gas sampling line couplings of coal-gasification pilot plants of these superalloys.