Abstract
In order to investigate the fracture toughness, crack tip opening displacement (CTOD) experiments were conducted on two X70 pipeline steel plates with different rolling processes. After the experiments, optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were employed to observe the microstructure and fracture morphology. The effects of precipitates on the fracture toughness and the crack initiation mechanism induced by inclusions were analyzed. The CTOD result shows that the steel with a lower finishing cooling temperature has a higher fracture toughness. Inclusions with different shapes and two kinds of precipitates with different sizes were observed. It can be concluded that precipitates with different sizes have different effects and mechanisms on the fracture toughness. Distinguished from the earlier researches, inclusions enriched in silicon can be also served as the crack initiation.
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References
B. Tanguy, T.T. Luu, G. Perrin, A. Pineau, and J. Besson, Plastic and damage behavior of a high strength X100 pipeline steel: experiments and modeling, Int. J. Pressure Vessels Piping, 85(2005), No.5, p.322.
S.S. Nayak, R.D.K. Misra, J. Hartmann, F. Siciliano, and J.M. Gray, Microstructure and properties of low manganese and niobium containing HIC pipeline steel, Mater. Sci. Eng. A, 494(2008), p. 456.
K.T. Corbett, R.R. Bowen, and C.W. Petersen, High-strength steel pipeline economics, Int. J. Offshore Polar Eng., 14(2004), p. 75.
H.B. Xue and Y.F. Cheng, Characterization of inclusions of X80 pipeline steel and its correlation with hydrogen-induced cracking, Corros. Sci., 53(2011), p. 1201.
D.J. Horsley, Background to the use of CTOA for prediction of dynamic ductile fracture arrest in pipelines, Eng. Fract. Mech., 70(2003), p. 547.
R. Ince, Determination of concrete fracture parameters based on two-parameter and size effect models using split-tension cubes, Eng. Fract. Mech., 77(2010), p. 2233.
M. He and F.G. Li, Modified transformation formulae between fracture toughness and CTOD of ductile metals considering pre-deformation effects, Eng. Fract. Mech., 77(2010), p. 2763.
A.S. Kumar, B.R. Kumar, G.L. Datta, and V.R. Ranganath, Effect of microstructure and grain size on the fracture toughness of a micro-alloyed steel, Mater. Sci. Eng. A, 527(2010), No.4–5, p.954.
H.V. Atkinson and G. Shi, Characterization of inclusions in clean steels: a review including the statistics of extremes methods, Prog. Mater. Sci., 48(2003), No.5, p.457.
J. Ma, B. Zhang, D.K. Xu, E.H. Han, and W. Ke, Effects of inclusion and loading direction on the fatigue behavior of hot rolled low carbon steel, Int. J. Fatigue, 32(2010), p. 1116.
H. Yu, Influences of microstructure and texture on crack propagation path of X70 acicular ferrite pipeline steel, J. Univ. Sci. Technol. Beijing, 15(2008), No.6, p.683.
H. Yu, Y. Sun, Q.X. Chen, H.T. Jiang, and L.H. Zhang, Precipitation behaviors of X70 acicular ferrite pipeline steel, J. Univ. Sci. Technol. Beijing, 13(2006), No.6, p.523.
L.F. Zhang, Indirect methods of detecting and evaluating inclusions in steel: a review, J. Iron Steel Res. Int., 13(2006), No.4, p.1.
Z.Y. Liu, X.G. Li, C.W. Du, L. Lu, Y.R. Zhang, and Y.F. Cheng, Effect of inclusions on initiation of stress corrosion cracks in X70 pipeline steel in an acidic soil environment, Corros. Sci., 51(2009), No.4, p.895.
T.Y. Jin, Z.Y. Liu, and Y.F. Cheng, Effect of non-metallic inclusions on hydrogen-induced cracking of API5L X100 steel, Int. J. Hydrogen Energy, 35(2010), No.15, p.8014.
H. Qiu, M. Enoki, Y. Kawaguchi, and T. Kishi, A model for the static fracture toughness of ductile structural steel, Eng. Fract. Mech., 70(2003), No.5, p.599.
R.Z. Wang, C.I. Garcia, M. Hua, K. CHO, H.T. Zhang, and A.J. Deardo, Microstructure and precipitation behavior of Nb, Ti complex microalloyed steel produced by compact strip processing, ISIJ Int., 46(2006), No.9, p.1345.
A.M. Zhao, Y. Wang, Y.L. Chen, D. Tang, X.T. Gao, and B.Q. Zuo, Precipitation behaviors of X80 acicular ferrite pipeline steel, Int J. Miner. Metall. Mater., 18(2011), No.3, p.309.
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Zhou, Mw., Yu, H. Effects of precipitates and inclusions on the fracture toughness of hot rolling X70 pipeline steel plates. Int J Miner Metall Mater 19, 805–811 (2012). https://doi.org/10.1007/s12613-012-0632-0
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DOI: https://doi.org/10.1007/s12613-012-0632-0