Phases formed to high temperatures in the interface and its influence on the deformation of stainless steel superduplex

In the present study it was observed the effects of aging in superduplex stainless steel 2507. For this, it was analyzed the microstructure and chemical composition of the steel before and after heat treatments. With this purpose heat treatments were performed at 650 degree C/8 h, 850 degree C/24 h and 1000 degree C/10 h. For the analysis of changes occurring in the microstructure of the material it was used the following techniques: Scanning Electron Microscopy and X-ray diffraction. These changes have directly influenced the mechanical properties of the material, and were determined using tensile testing, hardness measurements and microhardness. The aging of the material contributed to the precipitation of various phases in the microstructure of the material. It was identified peaks of sigma phase at the temperature of 850 and 1000 degree C but it was not identified peaks of ferrite, which indicates partial dissolution of secondary phases. There was a decrease in toughness and ductility of the material when compared with the material in the as received condition.