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Fracture behaviour and cleavage initiation in hypoeutectoid pearlitic steel
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SYSNO ASEP 0306608 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Ostatní články Title Fracture behaviour and cleavage initiation in hypoeutectoid pearlitic steel Title Lomové chování a štěpná iniciace podutektoidních perlitických ocelích Author(s) Holzmann, Miloslav (UFM-A)
Jurášek, L. (CZ)
Dlouhý, Ivo (UFM-A) RID, ORCIDSource Title International Journal of Fracture. - : Springer - ISSN 0376-9429
Roč. 148, č. 1 (2007), s. 13-28Number of pages 16 s. Language eng - English Country NL - Netherlands Keywords cleavage fracture ; fracture initiation ; pearlitic steel Subject RIV JL - Materials Fatigue, Friction Mechanics R&D Projects IAA200410502 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) 1QS200410502 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) CEZ AV0Z20410507 - UFM-A (2005-2011) DOI https://doi.org/10.1007/s10704-007-9173-3 Annotation The micromechanism of cleavage fracture in hypoeutectoid pearlitic R7T steel, commonly used for producing railway wheels, was investigated. Standard Charpy V-notch specimens were used in order to analyse the fracture at quasistatic and impact loading. Finite element 3D calculations were performed and the elastic-plastic behaviour of notched bars up to the fracture was simulated. Fractographic analysis was carried out in order to investigate the origin of cleavage initiation and its distance from the notch root. Independence of cleavage fracture stress on temperature evidenced the micromechanism of cleavage fracture to be microcrack propagation-controlled. For the investigated blunt-notched bend bars, an active volume exists ahead of the notch root in which pearlite colony-associated initiation is located. The cleavage fracture is thus governed by sites lying in the active volume predetermined by critical values of stress, strain and triaxiality. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2008
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