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  4. RPV模拟钢中纳米富Cu析出相的复杂晶体结构表征

材料工程, 2015, 43(7): 80-86. doi: 10.11868/j.issn.1001-4381.2015.07.014

RPV模拟钢中纳米富Cu析出相的复杂晶体结构表征

冯柳 1, , 周邦新 2, , 彭剑超 3, , 王均安 4,

1.上海大学材料研究所,上海200072;山东理工大学分析测试中心,山东淄博255049

2.上海大学材料研究所,上海200072;上海大学微结构重点实验室,上海200444

3.上海大学材料研究所,上海200072;上海大学微结构重点实验室,上海200444

4.上海大学材料研究所,上海200072;上海大学微结构重点实验室,上海200444

基金项目:   国家自然科学基金重点项目(50931003)   国家重点基础研究发展规划(973计划2011CB610503)   上海市重点学科建设项目(S30107)  

关键词： RPV模拟钢 , 热时效 , 纳米富Cu析出相 , 9R晶体结构

Characterization of a Complex Crystal Structure Within Cu-rich Precipitates in RPV Model Steel

Keywords： reactor pressure vessel model steel , thermal aging , nano Cu-rich precipitate , 9R crystal structure

RPV模拟钢样品经过890℃水淬,660℃调质处理,然后在400℃时效13000h后,用高分辨透射电镜和能谱仪相结合的方法研究了RPV模拟钢中纳米富Cu析出相中的复杂晶体结构.纳米富Cu析出相的平均尺寸约为20nm,除了观察到常见的亚稳态9R结构、3R结构和稳态fcc结构外,还观察到同一富Cu析出相由3种不同的晶体结构组成,并分别分布在5个不同的区域中,包括1处9R、2处fcc和2处3R结构.9R结构与相邻的2个fco结构形成的界面都具有特定的晶体取向,呈半共格关系,是由非孪晶9R结构演化而来.2处3R结构互为孪晶关系,是由孪晶9R结构演化而来.这种状态反映了纳米富Cu析出相从亚稳态演化到稳态结构的复杂过程.

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