Abstract
ABSTRACT Precipitation particles evolution in ASME Grade 91 steel after 233,823 h of creep exposure at 600 °C was characterised after grain boundary energyclassification in terms of misorientation angle (MOA): Low energy boundary(LEB) with MOA up to 15°, high energy boundary (HEB) with MOA from 15° to 45°, andmedium energy boundary (MEB) with MOA from 45° to 63°. The number density of the Laves phase stronglydepends on the boundary energy classification by MOA: the largest in the HEB,followed in order by the MEB and the LEB. The Z-phase particles is preferentiallylocated in grain boundaries where at least one of adjacent boundaries is theHEB or the MEB. Even though the block boundaries belong tothe MEB in terms of MOA, they are not the preferential site for the Z-phase due to their exceptionally smallboundary energy.
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