Abstract
Effect of solution temperature on the microstructure evolution in the segregation area of S31254 superaustenitic stainless steel plate was investigated. Samples were heated in the range of 950°C-1250°C for 0.5h and then quenched to room temperature. As the temperature was between 950°C and 1050°C, two different secondary particles precipitated and dispersed in matrix of the steel. When the solution temperature reached to 1150°C, any second phases could not be observed by SEM. In addition, several precipitating phases in the different position including grain interiors, grain boundaries and three-joint grain boundary were identified as Chi phase and Sigma phase in the tested steel using TEM.
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