PSI - Issue 2_B

J. Toribio et al. / Procedia Structural Integrity 2 (2016) 626–631

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Author name / Structural Integrity Procedia 00 (2016) 000–000

4. Conclusions The optimal wire drawing consists of using a die angle as low as possible with a bearing length equal to or higher than the wire radius. If a low die angle is not possible, an alternative way for improving the structural integrity against HE is by using varying die geometry with a secondary die angle as low as possible. Finally, the yielding history is a key issue in the generation of residual stress and plastic strain since important changes are produced in the hydrostatic stress and equivalent plastic strains distributions, and consequently, a carefully design of the straining path undergone during multi-pass drawing is advisable. Ackowledgements The authors wish to acknowledge the financial support provided by the following Spanish Institutions: Ministry for Science and Technology (MCYT; Grant MAT2002-01831), Ministry for Education and Science (MEC; Grant BIA2005-08965), Ministry for Science and Innovation (MICINN; Grant BIA2008-06810), Ministry for Economy and Competitiveness (MINECO; Grant BIA2011-27870) and Junta de Castilla y León (JCyL; Grants SA067A05, SA111A07 and SA039A08). References He, S., Van Bael, A., Li, S.Y., Van Houtte, P., Mei, F., Sarban, A., 2003. Residual stress determination in cold drawn steel wire by FEM simulation and X-ray diffraction. Materials Science and Engineering A 346, 101–107. Luksza, J., Majta, J., Burdek, M., Ruminski, M., 1998. Modelling and measurement of mechanical behaviour in multi-pass drawing process. Journal of Material Processing Technology. 80-81, 398–405. Martínez-Perez, M.L., Borlado, C.R., Mompean, F.J., García-Hernández, M., Gil-Sevillano, J., Ruiz-Hervias, J., Atienza, J.M., Elices, M., Peng, R.L., Daymond, M.R., 2005. Measurement and modelling of residual stresses in straightened commercial eutectoid steel rods. Acta Materialia 53, 4415– 4425. Överstam, H., 2004. The influence of bearing geometry on the residual stress state in cold drawn wire by the FEM. Journal of Materials Processing Technology 171, 446–450. Toribio, J., Kharin, V., Vergara, D., Lorenzo, M., 2010. Two-dimensional numerical modelling of hydrogen diffusion assisted by stress and strain. Advanced Materials Research 138, 117–126. Toribio, J., Kharin, V., Lorenzo, M., Vergara, D., 2011a. Role of drawing-induced residual stresses and strains in the hydrogen embrittlement susceptibility of prestressing steels. Corrosion Science 53, 3346–3555. Toribio, J., Lorenzo, M., Vergara, D., Kharin, V., 2011b. Hydrogen degradation of cold-drawn wires: a numerical analysis of drawing-induced residual stresses and strains. Corrosion 67, 075001-1–075001-8. Toribio, J., Lorenzo, M., Vergara, D., 2012. Influence of drawing straining path on hydrogen damage of prestressing steel wires. Key Engineering Materials 488-489, 775–778. Toribio, J., Lorenzo, M., Vergara, D., Kharin, V., 2013. Hydrogen embrittlement of cold drawn prestressing steels: the role of the die inlet angle. Materials Science 49, 226–233. Toribio, J., Lorenzo, M., Aguado, L., Vergara, D., Kharin, V., 2014. Influence of the die bearing length on the hydrogen embrittlement of cold drawn wires. Key Engineering Materials 577-578, 553–556. Toribio, J., Lorenzo, M., Vergara, D., 2015. On the use of varying die angle for improving the resistance to hydrogen embrittlement of cold drawn prestressing steel wires. Engineering Failure Analysis 47, 273–282.