Abstract
Production of Super Duplex Stainless Steel casting sometimes becomes difficult due to development of cracks, particularly in big casting. These cracks can be found during various stages of production. For this steel, deleterious precipitation of phases like sigma, chi, secondary austenite, various carbides and nitrides takes place at different temperature and time and they affect the properties of the steel. Among all such precipitates, sigma is most harmful. It has poor notch toughness and hard and brittle. They are potential source of crack development in the casting. In this study, occurrence of such precipitates examined by keeping the steel in critical temperature range and for varying time. At 800 & 900°C, ferrite diminishes with ageing time and transform to sigma and other harmful phases which sharply reduces toughness and ductility of steel. Sigma precipitates by holding the sample even for 1minute at 800°C. Faster cooling rate, good agitation of bath and minimum quenching time are some of the steps which reduces casting crack during heat treatment process.
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