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Duplex stainless steels (DSS) have become more attractive than single-phase austenitic and ferrite grades in industrial application due to their high strength and corrosion resistance in chloride-containing media. Due to low ductility region under hot working conditions these materials require special attention during processing. As heat treatments influence low cycle fatigue characterisation. The characteristics and properties of the industrially employed duplex grades has been discussed, moreover the presence and precipitation of sigma phases has been highlighted through ageing treatments. Based on up to date achieved outcomes, it appears that a quite homogeneous and good mechanical properties can be obtained by controlled composition and heat treatments .and it also enhances the wear properties. The most commonly formed and observed pernicious phase in DSS is sigma phase particles precipitation in a short period of time over a wide range of temperature. Hence an attempt has been made in our investigation to evaluate the low cycle fatigue changes when they are subjected to temperature 1100°C for a shorter duration for about 60 minutes. The low-cycle fatigue behaviour of a DSS was comparatively studied in standard heat-treated and aged at 800°C for 4 h.

Low cycle fatigue analysis of heat treated duplex stainless steel