Portal de Periódicos da CAPES

Cleavage Fracture of Iron Single Crystals

1973; The Iron and Steel Institute of Japan; Volume: 59; Issue: 7 Linguagem: Inglês

10.2355/tetsutohagane1955.59.7_955

1883-2954

Tsuneaki SAKAKI, Tadahisa NAKAMURA,

Fatigue and fracture mechanics

Iron single crystals with various orientations were tested at low temperatures.1) At-196°C, the behaviour of the crystals depended on the orientations of their stress axis. When the angle between the specimen axis and [001] was less than 26°, the specimens fractured by cleavage with prior twinning. Most of the specimens were cleaved at ‹011› type intersection of two twins, but some of them were cleaved by a twin going through the specimen surface. The specimens with the angle between [001] and tensile axis greater than 36° showed slip deformation preceded by twinning. The specimen with tensile axis near [111] was fractured by cleavage after crack opening at twins due to plastic deformation.2) The crystals tested at -130°C fractured in ductile manner with one exception.