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金属学报  2012 

利用APT对RPV模拟钢中界面上原子偏聚特征的研究

DOI: 10.3724/SP.J.1037.2011.00717, PP. 789-796

Keywords: 核压力容器模拟钢,原子探针层析法,晶界,相界面,偏聚

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Abstract:

核反应堆压力容器(RPV)模拟钢样品经过660℃调质处理和370℃时效3000h后,用原子探针层析法研究了晶界和相界面上原子偏聚的特征.结果表明,Ni,Mn,Si,C,P和Mo在晶界处均有不同程度的偏聚,偏聚倾向由强到弱依次为C,P,Mo,Si,Mn和Ni.Cu在晶界处会出现贫化现象.Si在晶界上的偏聚程度与晶界的特性有关.在这几种元素中,C在晶界上偏聚的宽度最大,如以成分分布图中浓度峰的半高宽来比较,C的偏聚宽度是Mn,Ni和Mo的1.5倍.在富Cu相与α-Fe的相界面处,Ni和Mn有明显的偏聚,而C,P,Mo和Si倾向偏聚在相界面的α-Fe一侧,且偏聚的程度比晶界处的低.

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