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Conversion of transgranular to intergranular fracture in NiCr steels
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SYSNO ASEP 0308083 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Ostatní články Title Conversion of transgranular to intergranular fracture in NiCr steels Title Konverze lomu z transkystalického na interkrystalický v NiCr ocelích Author(s) Hadraba, Hynek (UFM-A) RID, ORCID
Němec, O. (CZ)
Dlouhý, Ivo (UFM-A) RID, ORCIDSource Title Engineering Fracture Mechanics. - : Elsevier - ISSN 0013-7944
Roč. 75, č. 12 (2008), s. 3677-3691Number of pages 15 s. Language eng - English Country GB - United Kingdom Keywords intergranular fracture ; cleavage ; fracture toughness ; fracture stress ; micromechanics ; micromechanism ; fractal dimension Subject RIV JL - Materials Fatigue, Friction Mechanics R&D Projects IAA200410502 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) CEZ AV0Z20410507 - UFM-A (2005-2011) DOI 10.1016/j.engfracmech.2007.08.006 Annotation The paper is focused on quantification of causes and characteristics that govern the intergranular fracture initiation and propagation of this fracture micromechanism in competition with cleavage one. A NiCr steel of commercial quality and the same steel with an increased content of Sn and Sb have been used for the investigation. Step cooling annealing was applied in order to induce intergranular embrittlement and brittle fracture initiation in both steels. Standard bend and the pre-cracked Charpy type specimen geometries were both tested in three-point bending to determine the fracture toughness characteristics. Charpy V notch specimens tested statically in three-point bending supported by FEM calculation have been used for local fracture stress determination. Relation of cleavage fracture stress and critical stress for intergranular failure has been followed showing capability of this parameter for quantification of the transgranular/intergranular fracture conversion. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2008
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