CAJ | 학술논문

采用原子探针层析技术研究了核反应堆压力容器模拟钢中AlN相/α-Fe基体、富Cu相/α-Fe基体和AlN相/富Cu相三种相界面处Ni、Mn、P和C原子的偏聚特征.压力容器模拟钢经890℃保温0.5 h水淬,然后在500℃进行了20 h的时效处理.分析结果表明：Ni、Mn、C和P原子在富Cu相/AlN相界面上不发生偏聚；而在AlN相/α-Fe基体和富Cu相/α-Fe基体两种相界面上都会发生偏聚,且偏聚特征无明显区别,都是Mn的偏聚倾向大于Ni,C的偏聚倾向大于P.
채용원자탐침층석기술연구료핵반응퇴압력용기모의강중AlN상/α-Fe기체、부Cu상/α-Fe기체화AlN상/부Cu상삼충상계면처Ni、Mn、P화C원자적편취특정.압력용기모의강경890℃보온0.5 h수쉬,연후재500℃진행료20 h적시효처리.분석결과표명：Ni、Mn、C화P원자재부Cu상/AlN상계면상불발생편취；이재AlN상/α-Fe기체화부Cu상/α-Fe기체량충상계면상도회발생편취,차편취특정무명현구별,도시Mn적편취경향대우Ni,C적편취경향대우P.
The segregation characteristics of Ni, Mn, P and C atoms at the phase boundaries of AlN/α-Fe matrix, Cu-rich precip-itate/α-Fe matrix and AlN/Cu-rich precipitate in reactor pressure vessel ( RPV ) model steel were investigated by atom probe tomo-graphy ( APT) . RPV model steel specimens were heat treated at 890℃ for 0.5 h followed by water quenching and aging at 500℃ 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.