Micromechanical Aspects of Transgranular and Intergranular Failure Competition

Dlouhy, Ivo and Tarafder, Mita and Hadraba, Hynek (2011) Micromechanical Aspects of Transgranular and Intergranular Failure Competition. Key Engineering Materials , 465 (1.00 (SCI)). pp. 399-402.

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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.

Item Type:Article
Official URL/DOI:doi:10.4028/www.scientific.net/KEM.465.399
Uncontrolled Keywords:Intergranular fracture, cleavage, fracture toughness, fracture stress, micromechanics,micromechanism, fractal dimension
Divisions:Business Development and Monitoring
ID Code:2130
Deposited By:Dr Mita Tarafder
Deposited On:17 Dec 2010 15:37
Last Modified:18 Dec 2012 15:28
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