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Nanometre scale clusters form in Cu-containing reactor pressure vessel (RPV) steels during neutron irradiation. These clusters have a deleterious effect on mechanical properties, which can result in embrittlement and limit the reactor operating life. Thermal ageing of RPV steels can also induce the formation of solute clusters but it is not clear how similar these are to those formed during irradiation...
Two SA533B type steel weld specimens with different Ni concentrations have been investigated during long-term thermal ageing up to 49800 hrs at three temperatures (330degC, 365degC and 405degC). Although Sn as trace element is only present in the steels at a level of about 0.007 at%, it has been observed to segregate to Cu clusters at significant levels (up to 2 at%) in the low Ni steel. In contrast,...
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
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