球磨转速对含钆ODS钢中M_(23)C_(6)析出的影响研究  

Effect of Ball Milling Speed on Precipitation of M_(23)C_(6)in Gadolinium-containing ODS Steel

作　　者：杨新异 黄群英[1,2] YANG Xinyi;HUANG Qunying(Institute of Nuclear Energy Safety Technology,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China;Science Island Branch,Graduate School of University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]中国科学院合肥物质科学研究院,核能安全技术研究所,合肥230031 [2]中国科学技术大学研究生院科学岛分院,合肥230026

出　　处：《材料导报》2023年第17期232-237,共6页Materials Reports

基　　金：国家重点研发计划项目(2020YFB1901900);中国科学院国际合作局国际伙伴计划(116134KYSB20200056);安徽省“115”产业创新团队项目。

摘　　要：以“结构/屏蔽一体化”为研发目标的含钆ODS合金具有较优的中子屏蔽性能与高温力学性能,可作为小型模块化铅冷快堆中子屏蔽材料的研发方向之一。在机械合金化-放电等离子体烧结工艺制备含钆ODS-316L钢的研究中发现,球磨转速影响材料的析出相种类,如在220 r/min低球磨转速下,ODS-316L钢中仅存在纳米尺寸的Gd-Si-O析出相,而在300 r/min高球磨转速下,除纳米尺寸的Gd-Si-O析出相外,材料内还分布着大量百纳米尺寸的片层堆叠状M_(23)C_(6)型碳化物,且M_(23)C_(6)内同样存在纳米含钆氧化物颗粒。高球磨转速使球磨粉内元素的偏析与内应力的累积促进了M_(23)C_(6)的形核,随后的粉末烧结温度则为M_(23)C_(6)的生长提供了驱动力。此研究可为粉末冶金含钆ODS-316L钢的微观组织调控奠定一定的实验与理论基础。The gadolinium-containing oxide dispersion strengthening(ODS)alloy,which will promisingly be with good neutron shielding performance and elevated-temperature mechanical properties,can be used as one of the shielding materials for the small modular lead-cooled fast reactor.The gadolinium-containing ODS-316L steel was prepared through the powder metallurgy process of mechanical alloying-spark plasma sintering.It was found that the speed of ball-milling affected the types of precipitated phases in the steel.Nano-sized Gd-Si-O precipitates distributed in the ODS-316L steel at a low ball-milling speed of 220 r/min,while hundred-nanometers sized M_(23)C_(6)clusters and Gd-Si-O precipitates both distributed in the steel fabricated with high ball-milling speed of 300 r/min.A certain number of nanometer gadolinium-containing oxides distributed in M_(23)C_(6)clusters.The segregation of elements and the accumulation of internal stress caused by the high ball-milling speed in as-milled powders were conducive to the nucleation of M_(23)C_(6)precipitates,and the temperature of the powder sintering process provided a driving force for the growth of M_(23)C_(6)precipitates.This study can provide certain experimental experience and theoretical foundation for the microstructure control of powder metallurgy gadolinium-containing ODS-316L steel.

关 键 词：中子屏蔽合金 含钆氧化物弥散强化(ODS)钢 粉末冶金 球磨转速 M_(23)C_(6)型碳化物 

分 类 号：TL344[核科学技术—核技术及应用] TF124[冶金工程—粉末冶金]