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Micromechanical Aspects of Transgranular and Intergranular Failure Competition
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SYSNO ASEP 0355778 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Micromechanical Aspects of Transgranular and Intergranular Failure Competition Author(s) Dlouhý, Ivo (UFM-A) RID, ORCID
Tarafder, M. (IN)
Hadraba, Hynek (UFM-A) RID, ORCIDSource Title Key Engineering Materials - ISSN 1013-9826
Roč. 465, - (2011), s. 399-402Number of pages 4 s. Language eng - English Country CH - Switzerland Keywords intergranular fracture ; cleavage ; fracture toughness Subject RIV JL - Materials Fatigue, Friction Mechanics R&D Projects GAP107/10/0361 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z20410507 - UFM-A (2005-2011) UT WOS 000291704700092 DOI 10.4028/www.scientific.net/KEM.465.399 Annotation Quantification of characteristics that govern intergranular fracture initiation and propagation of this fracture micromechanism in competition with cleavage one is main aim of the paper. A NiCr steel of commercial quality and the same steel with an increased content of impurity elements, Sn and Sb, were used. Step cooling ageing was applied in order to induce intergranular embrittlement. Standard and pre-cracked Charpy type specimens were both tested in three-point bending to determine fracture toughness characteristics. In order to characterise the quantitative differences in fracture surfaces roughness a fractal analysis was applied. A boundary level of fractal dimension has been determined to be 1.12: fracture surface roughness with a higher value reflects high level of intergranular embrittlement and thus fracture resistance degradation. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2011
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