Abstract
Two kinds of hardening precipitations are observed in the ferritic phase of a PH 15-7 Mo type stainless steel after aging heat treatment: NiAl and another intermetallic compound, already known as “R phase”. The latter nucleates on dislocations, which induces drastic changes in their electron microscopy contrast; these changes are interpreted with a theoretical model. The precipitates then grow larger to a plate-like morphology, on which chemical analysis and determination of orientation relationships between ferrite and precipitates were carried out. Finally, the influence of both precipitations on mechanical properties is investigated.
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