PSI - Issue 2_B

Yoshiki Nemoto et al. / Procedia Structural Integrity 2 (2016) 2495–2503 Author name / Structural Integrity Procedia 00 (2016) 000–000

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5. Conclusions The Monte Carlo simulation model to predict cleavage fracture initiation process of ferrite pearlite steel was developed. Before the development of the model, the fracture initiation process is divided into three stage and the fracture condition of each stage is formulated. The simulation model are developed based on the formulations. The proposed model was validated by comparing the experimental results with predicted results in relation to three types of steel. They show almost good agreement and it means the proposed model represents the quantitative relationship between fracture toughness and microstructure of ferrite pearlite steel. However, some comparison results are not consistent and the improvement of them are still challenge. Acknowledgements Part of the present study was supported by ISIJ Research Promotion Grant. References Almoud E.A., Timbres D.H., Embury J.D., 1969. The Influence of second phase particles on fracture. Proceedings of the Second International Congerence on Fracture. Beremin FM., 1987, A local criterion for cleavage fracture of a nuclear pressure vessel steel. Metallurgical and Materials Transactions A, 14, 2277 2287. Bingley M.S., 2001. Effect of grain size and carbide thickness on impact transition temperature of low carbon structural steels. Materials Science and Technology 17, 700-714. Bordet S.R., Karstensen A.D., Knowles D.M., Wiesner C.S., 2005. A new statistical local criterion for cleavage fracture in steel. Part I: model presentation. Engineering Fracture Mechanics 72, 435-452. Bordet S.R., Karstensen A.D., Knowles D.M., Wiesner C.S., 2005. A new statistical local criterion for cleavage fracture in steel. Part II: application to an offshore structural steel. Engineering Fracture Mechanics 72, 453-474. BS 7448: Part 1, 1991. Fracture Mechanics Toughness Tests, Part 1, Method for Determination of K_Ic, Critical CTOD and Critical J Values of Metallic Materials, British Standard Institution. Chen J.H., Wang G.Z., 1998. On scattering measured values of fracture toughness parameters. International Journal of Fracture 94, 33-49. Curry D.A., Knott J.F., 1987. Effects of microstructure on cleavage fracture stress in steel. Metal Science 12, 511-514. Daoming Li, 1991. Cleavage fracture behavior of carbon steels for different ferrite-pearlite contents. Material Science and Technology, Vol.7,pp. 311-314. Dassault Systemes. SIMULIA, 2011. Abaqus Analysis User's Manual Version 6.10. Duckworth W.E., Baird J.D., 1969. Mild Steels, J. Iron Steel Inst., Vol.207, 854. Hahn G.T., 1984. The influence of microstructure on brittle fracture toughness. Metallurgical Transaction A 15, 947-959. Hiraide K., Shibanuma K., Aihara S., 2015. Development of Numerical Model to Predict Cleavage Fracture Toughness of Ferrite-Pearlite Steels. Tetsu-to-Hagane (in Japanese), Vol. 101, 34-43 Hyzak J.M., Bernstein I.M., 1976. The role of microstructure on the strength and toughness of fully pearlistic steels. Metallurgical Transactions A, Vol.7, 1217-1224. Lin T., Evans A.G., Ritchie R.O., 1987. Stochastic modeling of the independent roles of particle size and grain size in transgranular cleavage fracture. Metallurgical Transactions A, 18A, 641-651. McMahon C.J., Cohen M., 1965. Initiation of cleavage in polycrystalline iron. Acta Metallurgica 13, 591-604. Nemoto Y., Shibanuma K., Suzuki K., Aihara S., Hiraide T., 2016. Quantitative Evaluation of Microstructural Influence on The brittle fracture toughness of Ferrite-Pearlite Steels. International Journal of Offshore and Polar Engineering, accepted Park Y.J., Bernstein I.M., 1979. The process of crack initiation and effective grain size for cleavage fracture in pearlitic eutectoid steel. Metallurgical Transactions A, Vol.10A, 1653-1664. Peneau A., 2006. Development of the local approach to fracture over the past25 years: theory and applications. International Journal of Fracture 13, 139-166. Petch N.J., 1986. The influence of grain boundary carbide and grain size on the cleavage strength and impact transition temperature of steel. Acta Metallurgica 34, 1387-1393. Pickering F.B., 1971. Towards Improved Toughness and Ductility. Climax Molybdenum Co. Greenwich SanMartin J.I., Rodriguez-Ibabe J.M., 1999. Determination of energetic parameters controlling cleavage fracture in a Ti-V microalloyed ferrite pearlite steel. Scripta Materialia, Vol.40, 459–464. Shibanuma K., Aihara S., Suzuki K., 2015. Prediction Model on Cleavage Fracture Initiation in Steels having Ferrite-Cementite Microstructures Part I: Model Presentation. Engineering Fracture Mechanics 151, 161-180. Shibanuma K., Aihara S., Suzuki K., 2015. Prediction Model on Cleavage Fracture Initiation in Steels having Ferrite-Cementite Microstructures Part II: Model Validation and Discussions, Engineering Fracture Mechanics 151, 181-202.