engleski

Fracture analysis of lifting hooks made of carbon steels

Modern construction would not have been possible without steel as primary material. It has to satisfy the requirements for acceptable application under different conditions. The goal of this investigation was to examine the cause of fracture of lifting hooks made of two different plain steels(C45 and B 500B) via mechanical and microstructural properties. For that purpose mechanical tensile and hardness tests, Charpy impact test were carried out as well as light and scanning electron microscopy. Chemical omposition was determined by optical emission spectrometer. The obtained results show that investigated steels have the lack of purity with respect to the inclusions, microporosity and high copper content. So the lifting hooks made of plain steels could be easily fractured. Also, galvanizing as corrosion protection is not recommended because it might lead to the harmful effect on the mechanical properties of the material.

fracture ; lifting hook ; carbon steel ; mechanical properties ; microstructure

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