OALib Journal期刊
利用APT对RPV模拟钢中富Cu原子团簇析出的研究
DOI: 10.3724/SP.J.1037.2011.00606
Keywords: 核压力容器模拟钢 ,富Cu团簇 ,原子探针层析技术 ,相界面
Abstract:
提高了Cu含量的核反应堆压力容器(RPV)模拟钢经过880℃水淬和660℃调质处理,在370℃时效不同时间后,利用原子探针层析技术(APT)进行分析.结果表明样品经过1150h时效后,富Cu团簇正处于析出过程的形核阶段;经过3000和13200h时效后析出了富Cu团簇,团簇的平均等效直径分别为1.5和2.4nm,团簇中Cu的平均浓度分别为45%和55%(原子分数),团簇的数量密度约为4.2×1022m-3;样品经过13200h时效后,α-Fe基体中的Cu含量为(0.15±0.02)%,仍然高于Cu在α-Fe中平衡固溶度的理论计算值,说明这时富Cu团簇的析出过程还没有达到平衡.对渗碳体的分析结果表明,Ni,Si和P偏聚在渗碳体和α-Fe基体的相界面附近,Mn,Mo和S富集在渗碳体中;并没有观察到Cu在相界面上偏聚的现象.
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