Hydrogen crack initiation and propagation in pure iron single crystal
Authors: Hinotani, s.; Ohmori, Y.; Terasaki, F.
Source: Materials Science and Technology, Volume 10, Number 2, February 1994 , pp. 141-148(8)
Publisher: Maney Publishing
Abstract:The initiation and propagation of hydrogen cracks in a pure iron single crystal have been investigated via notched tensile tests with simultaneous cathodic charging of hydrogen. The notch opening displacement for hydrogen crack growth when the tensile direction was parallel to  was much smaller than for  tension. Hydrogen cracks under  tension propagated in a straight line on the (001) plane from the notch root with only slight plastic deformation, whereas under  tension they propagated in a zigzag fashion with significantly larger plastic strain accompanying many slip bands. The slip band formation and the crack arrest patterns on the fracture surfaces indicate that hydrogen cracks were initiated and propagated by dislocation reactions on the slip systems in accordance with calculations for the maximum resolved shear stress distribution around the crack tip. The difference in hydrogen crack propagation between  and  oriented specimens has been explained by assuming that 〈001〉 Cottrell dislocations are stabilised by a high density of hydrogen atoms transported by dislocations which coalesce with each other.
Document Type: Research Article
Publication date: 1994-02-01
Authors wishing to cite fast track papers should give the journal name and the article DOI. This will enable reference linking via CrossRef and allow forward and backward citation tracking systems to associate the fast track citation with the final journal reference.Materials Science and Technology is the successor of two previous titles, for which digitised archives are available: Metal Science (Vols. 1—17; 1967—84) and Metals Technology (Vols. 1—11; 1974—84).
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