将Cu含量高于实际核反应堆压力容器(RPV)钢的模拟钢在880℃水淬后,在660℃进行调质处理,然后在370℃时效不同时间,采用TEM,原子探针层析法(APT)和冲击实验对其进行研究.结果表明,时效1150h后,富Cu团簇的析出仍处于形核阶段,对韧-脆转变温度(DBTT)没有明显的影响;时效3000h后,试样中析出了平均尺寸为1.5nm的富Cu团簇,主要分布在位错线上,数量密度达到4.2×1022m-3,DBTT由调质处理后的-100℃升高至-60℃;时效13200h后,富Cu团簇略有长大,平均尺寸达到2.4nm,团簇的数量密度与时效3000h的试样处于相同数量级,DBTT升高至-45℃.采用热时效方法使富Cu团簇析出后,DBTT只提高了55℃,没有中子辐照引起的那样显著,这不仅是因为富Cu团簇的数量密度低,基体中没有中子辐照产生的晶体缺陷也是重要的原因.
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