Effects of welding residual stresses and phosphorus segregation on cleavage delamination fracture in thick S355 J2 G3+N steel plate |
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| Affiliation: | 1. Welding Institute Ltd., Ptujska 19, Ljubljana, Slovenia;2. Acroni d.o.o., Cesta Borisa Kidriča 44, 4270 Jesenice, Slovenia;3. University of Ljubljana, Faculty of Natural Sciences and Engineering, Aškerčeva 12, 1000 Ljubljana, Slovenia;1. VTT Technical Research Centre of Finland Ltd., P. O. Box 1000, FI-02044 VTT, Kemistintie 3, Finland;2. Aalto University, Department of Mechanical Engineering, Otakaari 4, Espoo, Finland;1. National Engineering Research Center of Advanced Rolling, University of Science and Technology Beijing, Beijing 100083, China;2. Collaborative Innovation Center of Steel Technology, University of Science andTechnology Beijing, Beijing 100083, China;1. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, People''s Republic China;2. Tangshan Iron and Steel Company, Tangshan 063000, People''s Republic China;3. Laboratory for Excellence in Advanced Steel Research, Department of Metallurgical, Materials and Biomedical Engineering, University of Texas at El Paso, TX 79968, USA;1. Institute for Frontier Materials (IFM), Deakin University, Geelong, VIC 3217, Australia;2. R&D Centre of Wuhan Iron & Steel Corp. (WISCO), Wuhan 430080, China |
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| Abstract: | Due to residual tensile stresses acting through the material’s thickness a cleavage fracture occurred in the central part of a thick steel plate during the cooling of a welded T-joint. Steel in the normalized rolled state, without non-metallic inclusions and with a very good contraction in the “Z” axis, is brittle because of its banded, ferrite–pearlite microstructure, which is dependent on phosphorus segregation. A normalizing heat treatment greatly improved the toughness of the central part of the thick plate and prevented its cracking during the cooling of the welded T-joint. |
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| Keywords: | Phosphorus banding Low toughness Brittle fracture |
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