毒物不锈钢屏蔽材料中第二相的析出行为  

Precipitation behaviors of second phase in toxic stainless steel shielding material

作　　者：赵勇 刘云明[1] 谷明非[2] 潘钱付[1] 张宏智 强瑞[1] 王录全[1] Zhao Yong;Liu Yunming;Gu Mingfei;Pan Qianfu;Zhang Hongzhi;Qiang Rui;Wang Luquan(National Key Laboratory of Nuclear Fuel and Materials,Nuclear Power Institute of China,Chengdu Sichuan 610213,China;Science and Technology on Reactor System Design Technology Laboratory,Nuclear Power Institute of China,Chengdu Sichuan 610213,China)

机构地区：[1]中国核动力研究设计院反应堆燃料及材料重点实验室,四川成都610213 [2]中国核动力研究设计院核反应堆系统设计技术重点实验室,四川成都610213

出　　处：《金属热处理》2020年第5期34-39,共6页Heat Treatment of Metals

基　　金：四川省科技计划项目(2018GZ0510)。

摘　　要：利用光学显微镜(OM)、扫描电镜(SEM)和X射线衍射仪(XRD)对毒物不锈钢中第二相的析出行为进行了研究,并分析了第二相析出对基体组织稳定性和轧制开裂的影响机制。结果表明:不锈钢中第二相主要以Gd-Ni系为主,其析出数量随着Gd含量的增加而增加,当Gd含量(质量分数)由1. 87%增加至7. 87%时,第二相的析出面积分数由5. 5%增至20. 3%。其次,第二相的析出破坏了基体组织的稳定性,随着Gd含量的增加,不锈钢基体组织经历了单相奥氏体→奥氏体+铁素体两相组织→单相铁素体的转变过程。第二相的析出使得不锈钢塑性下降,同时促进轧制裂纹的萌生和发展。Precipitation behaviors of the second phase of toxic stainless steel was carried out by means of optical microscope( OM),scanning electron microscope( SEM) and X-ray diffraction( XRD),and the influence mechanism of the second phase precipitation on the stability of the matrix and rolling cracking was also analyzed. The results show that the second phase in the tested stainless steel is mainly Gd-Ni system,and its amount increases with the increase of Gd content. When the mass fraction of Gd increases from 1. 87% to 7. 87%,the area fraction of the second phase increases from 5. 5% to 20. 3%. Then,the precipitation of the second phase destroys the stability of the matrix structure. With the increase of Gd content,the matrix structure undergoes the transformation from single-phase austenite to austenite plus ferrite,and finally to single-phase ferrite. The precipitation of the second phase reduces the plasticity of the stainless steel and promotes the initiation and development of rolling cracks.

关 键 词：毒物不锈钢 第二相 析出 

分 类 号：TL34[核科学技术—核技术及应用]