engleski

The effect of long-term annealing at elevated temperature on microstructure and hardness of heat-resistant steel

The stainless steel group AISI 310 is very often used for application in high-temperature conditions. In this work was investigated the effect of long-term annealing on microstructure and hardness of AISI 310S (24.3% Cr-19.3% Ni – 1.8% Mn – 0.21% Mo – 0.67% Si, wt.%) heat- resistant steel. Microstructural changes and hardness distribution were analyzed after isothermal annealing at 800 °C in the long-term exposure (from 1 to 1740 hours). Microstructure and fracture surface mode were analyzed using scanning electron microscopy (SEM) equipped with energy dispersive X-ray spectroscopy (EDS). It was found that after annealing the sigma phase particles were precipitated at grain boundaries and within austenite grains.

heat-resistant steel; annealing; sigma phase; hardness; fracture surface

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