RPV模拟钢热时效过程中碳化物与基体界面元素的偏聚  

Element Segregation of Carbide/Matrix Interface in RPV Model Steel after Thermal Aging

作　　者：贾向南[1,2] 王均安[1,2] 蔡琳玲[1,2] 徐刚[1,2] 王晓娇[1] 刘文庆[1] 周邦新[1,2] 

机构地区：[1]上海大学微结构重点实验室,上海200444 [2]上海大学材料研究所,上海200072

出　　处：《上海大学学报（自然科学版）》2013年第1期54-60,共7页Journal of Shanghai University:Natural Science Edition

基　　金：国家重点基础研究发展计划(973计划)资助项目(2011CB610503);国家自然科学基金资助项目(50931003);上海市重点学科建设资助项目(S30107)

摘　　要：研究不同磷含量的反应堆压力容器(reactor pressure vessel,RPV)模拟钢在880℃固溶,400℃不同时间时效后碳化物周围元素的偏聚.结果表明,低磷和高磷模拟钢在时效过程中均发现板条内碳化物与基体界面处存在磷偏聚,偏聚程度与晶界一致.高磷样品时效150 h,P,Si和C同时在厚度约为20 nm的范围内富集,其浓度为基体的2倍;高磷样品时效500 h,在Fe_3C与基体的界面处分别存在厚度为7 nm的P和Si偏聚层,其中P偏聚在近Fe_3C一侧,Si偏聚在近基体一侧,Si的偏聚阻碍了碳化物的长大.Element segregation in thermal aged nuclear reactor pressure vessel （RPV） model steels with different amount of phosphorus was investigated by atom probe tomography （APT） analysis. After the initial heart treatment at 880 ℃-0.5 h and water quenching, the specimens were aged at 400℃ for up to 500 h. The results show that phosphorus segregated to the carbide/matrix interface in both lower and higher phosphorus-containing specimens. A precipitate of phosphorus, silicon and carbon, with a thickness of about 20 nm, formed in the higher phosphorus- containing specimens aged for 150 h. By extending aging time, phosphorus and silicon segregated and formed a thin layer at the boundaries of Fe3C. Silicon segregation suppressed the growth of FeaC.

关 键 词：反应堆压力容器模拟钢 热时效 原子探针层析 元素偏聚 

分 类 号：TG142.1[一般工业技术—材料科学与工程]