Abstract: By example of steel 17G1S, the regularities in the impact fracture of Charpy specimens at normal and low temperatures are described. The relationship between the energy parameters of fracture (impact toughness) and the deformation response of the material (the height of shear lips) of the specimens from the pipe steel is established. The micromechanisms of impact fracture of the material are described. At 20 °C and –30 °C, focal splitting of the material was observed on the fracture surface of specimens; at –60 °C, the material failed in a brittle manner by the mechanism of cleavage.Keywords: impact toughness, main gas pipeline, failure analysisPublished in DKUM: 08.08.2017; Views: 842; Downloads: 353 Full text (2,03 MB)This document has many files! More...
Abstract: The regularities and spatial distribution of multiple cracking of a nanocoating are investigated. It is found that in the cracking zones the relaxation of the stresses accumulated in the coating takes place; moreover, the intensity of its failure is determined by the structural level of defect accumulation. A new algorithm for a digital identification of the elements of a crack network in a nanocoating is proposed, and its adequacy is checked.Keywords: nanocoatings, cracks, materials testingPublished in DKUM: 10.07.2015; Views: 864; Downloads: 106 Full text (260,70 KB)This document has many files! More...
