Ni对RPV模拟钢中富Cu原子团簇析出的影响-中国材料进展

文章信息/Info

Title:: Effect of Nickel Alloying Element on the Precipitation of Cu Rich Clusters in RPV Model Steel

作者:: 周邦新; 王均安; 刘庆东; 刘文庆; 王伟; 林民东; 徐刚; 楚大锋; (1.上海大学材料研究所，上海 200072)
(2.上海大学微结构研究重点实验室，上海 200444)

Author(s):: ZHOU Bangxin; Wang Jun‘an1; LIU Qingdong2; LIU Wenqing WANG Wei1; LIN Mindong1; XU Gang1; CHU Dafeng; (1.Institute of Materials, Shanghai University, Shanghai 200072, China)
(2.Key Laboratory for Advanced MicroAnalysis, Shanghai University, Shanghai 200444, China)

摘要:: 用原子探针层析技术和时效模拟方法，研究了不同Ni含量并且提高了Cu含量的反应堆压力容器（RPV）用模拟钢中富Cu、富Ni和富Mn原子团簇的形成。结果表明，提高钢中的Ni含量会促使富Cu原子团簇的析出，富Cu原子团簇中含有Ni和Mn。实验检测到富Ni的原子团簇，团簇中含有Cu和Mn，富Ni原子团簇可以作为富Cu原子团簇析出时的形核区。实验还检测到富Mn原子团簇，当Mn原子团簇中含有较高的Ni时，它也可以成为富Cu原子团簇析出时成核的地方。由于钢中的合金元素Ni在形成富Ni原子团簇后会成为富Cu原子团簇析出时成核区，因而提高Ni的含量将促进富Cu原子团簇的析出，这是合金元素Ni会增加压力容器钢中子辐照脆化敏感性的本质原因。

Abstract:: The effect of nickel alloying element on the precipitation of Cu rich clusters in RPV model steel has been investigated by means of atom probe tomography. 40 kg ingots of RPV model steel were prepared by vacuum induction furnace melting with two different Ni contents (0 79 wt.% and 1 52 wt.%) and with higher Cu content (0 5 wt.%). The specimens of 50 × 40 mm 2, 4 mm in thickness, were heattreated by 880 ℃-20 min water quenching, 660 ℃-10 h tempering, and 400 ℃ aging, different from 100 h to 2 000 h. The results show that the increase of nickel content in RPV model steels will...