Resumo

FERNANDEZ-COLUMBIE, Tomás et al. Effect of creep temperature on HK-40 refractory austenitic steel. Ingeniería Mecánica [online]. 2023, vol.26, n.1, pp. 60-67.  Epub 12-Set-2023. ISSN 1815-5944.

The work aimed to determine the effect of creep temperature on HK-40 refractory steel used in the manufacture of sweeping arms of reduction furnaces and exposed to creep conditions. The exterior, interior and central zone of the arm were analyzed to determine the structural transformations that occur according to the temperature conditions to which it is exposed. It was determined that the heat provided by the effect of the combustion of oil and by the physical heat of the air in combustion chambers increases gradually and enables failure by creep due to the combined action of stress and heat. The microstructure of HK-40 steel in the three zones at 760 °C, is an austenitic matrix with M23C6 carbides at the grain boundaries, without dendritic structureand a band of dechromed austenite surrounded by primary carbides (eutectic), which causes brittleness and induces failure, the presence of crack in the outer area of the arm occurred in an area foreseen of possible carbides.

Palavras-chave : effect of creep temperature; grain boundaries; carbides M23C6, cracks; HK-40 refractory austenitic steel..

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