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- W1581196544 abstract "The crystal structure of Cu-rich nanophase in reactor pressure vessel(RPV) model steel was investigated by means of HRTEM.EDS and APT methods.RPV model steel was prepared by vacuum induction furnace melting with higher content of Cu(0.6%,mass fraction).The ingot about 40 kg in weight was forged and hot rolled to 4 mm in thickness and then cut to specimens of 40 mm×30 mm.Those specimens were further heat treated by 880℃for 0.5 h water quenching and 660℃for 10 h tempering,and finally aged at 370℃for 6000 h.It was observed that the Cu atoms segregated on {110} planes ofα-Fe matrix in a period every three layers and the distortion of crystal lattice was induced by inner stress produced by the segregation of Cu atoms during the nucleation of the precipitation of Cu-rich nanophase.The inner stress in Cu-rich regions enhanced with the increase of Cu concentration as well as the enlargement in size.It was also observed that the Cu-rich regions underwent a transformation from bcc structure to 9R structure with twins by means of a shear along the {110} plane ofα-Fe matrix.Finally,the Cu-rich clusters transformed to fcc structure with further increase of Cu content.The results obtained by APT analysis show that the equivalent diameter and the number density of Cu-rich clusters are about 1—8 nm and 0.71×10~(23) m~(-3),respectively.The content of 3%—8%Ni and Mn within the Cu-rich clusters was detected.It is suggested that the growth of Cu-rich clusters was restrained by the segregation of Ni and Mn atoms on the boundaries around the Cu-rich clusters." @default.
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- W1581196544 date "2011-07-11" @default.
- W1581196544 modified "2023-09-24" @default.
- W1581196544 title "INVESTIGATION ON THE PRECIPITATION AND STRUCTURAL EVOLUTION OF Cu-RICH NANOPHASE IN RPV MODEL STEEL" @default.
- W1581196544 doi "https://doi.org/10.3724/sp.j.1037.2011.00178" @default.
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