Duplex Stainless Steel Subjected to Normalized Thermal Treatment

Abstract

In the research, the mechanical behavior of duplex stainless steels SAF 2205 and 2507 subjected to Normalized thermal treatments at temperatures at temperatures of 900, 950 and 1000oC for a time of 7 minutes for SAF 2205 and 15 minutes for SAF 2507 were evaluated. It was determined that the mechanical strength increased considerably the higher value was found at 900 °C. It was determined that the KIC values for the normalized conditions of 900 oC and 950oC, reduce strongly in both steels with respect to the original condition. However, it is clearly reflected that for the normalized condition at 1000 °C the KIC is fully recovered, and for the temperature range of 700 °C to 900 °C, the values of impact toughness suffer a drastic decrease, caused by the appearance of intermetallic phases.