Characterization of Segregation and Precipitation at Grain Boundaries in Thermally Aged Pressure Vessel Steels

In this paper, weld materials from two steels similar to SA553B type commercial steels have been analysed after long-term thermal ageing at 330degC and 365degC for 49800 hrs. Precipitation and segregation at grain boundaries have been characterized using field ion microscopy and 3-dimensional atom probe analysis