Abstract
The precipitation behavior of the strengthening precipitate Cu-rich phase at the early aging stage in 18Cr9Ni3 Cu Nb N austenitic heat-resistant steel, which is commonly used as tubes for superheater and /or reheater at 600℃ of USC power plants, has been investigated by three dimensional atom probe(3DAP), and C curve of Cu-rich phase in 18Cr-9Ni type steel has been given. Experimental results show that the Cu- rich phase precipitates quickly at the early stage of long- term aging treatment at both650℃ and 700℃. The Cu-rich segregation clusters quickly form and then the Cu atoms diffuse from the gmatrix into the Cu-rich segregation clusters. The atoms of Fe, Cr and Ni from Cu-rich clusters defuse outwards to the g-matrix simultaneously, finally the Cu-rich phase forms.
Published Version
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