RPV模拟钢中相界面处原子的偏聚特征  

Atomic segregation characteristics on phase boundaries in RPV model steel

作　　者：冯柳[1,2] 周邦新[1,3] 刘文庆[1,3] 王均安[1,3] 王晓姣[1,3] 

机构地区：[1]上海大学材料研究所,上海200072 [2]山东理工大学分析测试中心,淄博255049 [3]上海大学微结构重点实验室,上海200444

出　　处：《北京科技大学学报》2014年第2期194-199,共6页Journal of University of Science and Technology Beijing

基　　金：国家重点基础研究发展规划资助项目(2011CB610503);国家自然科学基金重点资助项目(50931003);上海市重点学科建设资助项目(S30107)

摘　　要：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.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.

关 键 词：压水堆 压力容器 铁素体钢 相界面 偏聚 氮化铝 

分 类 号：TG142.74[一般工业技术—材料科学与工程]