الفهرس 
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Abstract
Stainless steels are exposed to elevated temperatures during welding, casting or high temperature services. These high temperatures cause the precipitation of several intermetallic phases leading to the deterioration of the mechanical and corrosion resistance properties of stainless steels. Each of the austenitic, ferritic and duplex stainless steel families has certain time/temperature precipitation range, which allows specific phases to precipitate in the material structure.
In this work, intermetallicsprecipitation in the super duplex stainless steelUNS S32760 is studied. For comparison purposes, UNS S32760 is compared against two other types of stainless steel, UNS S42900 and UNS N08367, representatives of the ferritic and the super austenitic stainless steel families.Due to their corrosion resistance,these three stainless steel grades have wide range of applications from the food to the seawater handling industries, where high corrosion resistant alloys are needed.
The purpose of this study is to identify the interrelation between the different intermetallic precipitates and the austenitic, ferritic and duplex structures ofthe three stainless steel grades. Also, to estimate the impact of these intermetallicprecipitateson the mechanical and corrosion resistance properties of the stainless steel grades.
For these three stainless steel grades several heat treatments are conducted by isotehrmal holding for different holidng times before quenching in water. Further testing is carried out by investigating the microstructure, XRD, SEM, hardness, microhardness, Charpy impact toughness and corrosion testing, then compared against each other and against the unheated material properties.