TY - GEN
T1 - Fatigue crack growth in SAW welded joints of api 5L steel pipe in the short radial direction
AU - Herrera, D. Angeles
AU - Velázquez, J. L.Gonzalez
PY - 2009
Y1 - 2009
N2 - The fatigue crack growth of longitudinal SAW welds of a API 5L X42 steel pipe was evaluated using curved three point bend test specimens, where the radius of curvature of the specimens was equal to the pipe radius, so that no extensive machining or flattening was required. The fatigue crack growth tests were done in a servohydraulic closed loop machine under load control, in air at room temperature. The daldN vs AK plots and Paris's equation constants were obtained for the base metal, deposited metal and heat affected zone in the CR orientation, which corresponds to the short transverse direction of the pipe. The greater resistance to fatigue crack growth was the base metal, whereas the deposited metal showed the least resistance to the fatigue crack propagation. The deposited metal and the heat affected zone behaved according to Paris's law, unlike the base metal, that showed a high dispersion of the fatigue crack growth rates. This behavior was due to the propagation of the crack in the direction transverse to the banded microstructure. Furthermore, the differences in fatigue crack growth rates among each zone were also related to the roughness of the fracture surfaces and fracture toughness.
AB - The fatigue crack growth of longitudinal SAW welds of a API 5L X42 steel pipe was evaluated using curved three point bend test specimens, where the radius of curvature of the specimens was equal to the pipe radius, so that no extensive machining or flattening was required. The fatigue crack growth tests were done in a servohydraulic closed loop machine under load control, in air at room temperature. The daldN vs AK plots and Paris's equation constants were obtained for the base metal, deposited metal and heat affected zone in the CR orientation, which corresponds to the short transverse direction of the pipe. The greater resistance to fatigue crack growth was the base metal, whereas the deposited metal showed the least resistance to the fatigue crack propagation. The deposited metal and the heat affected zone behaved according to Paris's law, unlike the base metal, that showed a high dispersion of the fatigue crack growth rates. This behavior was due to the propagation of the crack in the direction transverse to the banded microstructure. Furthermore, the differences in fatigue crack growth rates among each zone were also related to the roughness of the fracture surfaces and fracture toughness.
KW - Base metal (BM)
KW - Deposited metal (DM)
KW - Fatigue crack propagation (FCP)
KW - Girth radial direction (CR)
KW - Heat affected zone (HAZ)
UR - http://www.scopus.com/inward/record.url?scp=70349286096&partnerID=8YFLogxK
M3 - Contribución a la conferencia
SN - 9780878493302
T3 - Advanced Materials Research
SP - 9
EP - 18
BT - 17th International Materials Research Congress; from the 17th International Materials Research Congress, Symposium 11, Fracture Mechanics
T2 - 9th Edition of the Symposium Fracture Mechanics; Held within the Activities of the 17th International Materials Research Congress, IMRC
Y2 - 18 August 2008 through 21 August 2008
ER -