Atomic segregation characteristics on phase boundaries in RPV model steel

作者：Feng Liu; Zhou Bang Xin^*; Liu Wen Qing; Wang Jun An; Wang Xiao Jiao

来源：Journal of University of Science and Technology Beijing, 2014, 36(2): 194-199.

DOI：10.13374/j.issn1001-053x.2014.02.009

• AlN
• Atom-probe tomography
• C atoms
• Cu-rich precipitates
• Nano-phase
• Reactor Pressure Vessel
• Steel specimens
• Water quenching

The segregation characteristics of Ni, Mn, P and C atoms at the phase boundaries of AlN/α-Fe matrix, Cu-rich precipitate/α-Fe matrix and AlN/Cu-rich precipitate in reactor pressure vessel (RPV) model steel were investigated by atom probe tomography (APT). RPV model steel specimens were heat treated at 890°C for 0.5 h followed by water quenching and aging at 500°C for 20 h. The results demonstrate that Ni, Mn, C and P atoms do not segregate to the Cu-rich phase/AlN phase boundary, only segregate to the AlN/α-Fe and Cu-rich nanophase/α-Fe phase boundaries, and their segregation characteristics have no significant differences. It is also observed that Mn has a larger segregation tendency than Ni, and C has a larger than P at both different phase boundaries of Cu-rich nanophase/α-Fe and AlN/α-Fe.

• 出版日期2014
• 单位山东大学; 上海大学