摘要
为研究铁素体不锈钢中铜析出相的析出过程和晶体结构演化规律,采用原子探针层析技术(APT)和高分辨透射电子显微镜(HRTEM)观察了铜析出相的长大过程。结果显示:随着时效时间的延长,富铜相尺寸增大,数量密度降低,析出相形状由最初的球状转化为椭球状,最后成为杆状。析出相长大曲线可以拟合为r_(1)=2.45t^(1/3)-4.46,符合Ostwald熟化规律。9R结构与基体的取向关系为(114)_(9R)//(011)_(a-Fe),[110]_(9R)//[111]_(a=Fe)。本实验钢含铜相析出序列为bcc→9R→3R→fcc。
In order to study the precipitation process and crystal structure evolution of copper precipitate in ferritic stainless steel, the growth process of copper precipitate was observed by atomic probe tomography(APT) and high resolution transmission electron microscopy(HRTEM). As a result, the size of copper precipitate increases and the quantity density decreases with the prolonging of annealing time. And the shape of the precipitated phase changes from the initial spheroid to ellipsoid, and finally to rod. The growth curve of the copper precipitate can be fitted into a formularr_(1)=2.45t^(1/3)-4.46, which is consistent with Ostwald ripening rule. The orientation relationship between 9 R structure and matrix is(114)_(9R)//(011)_(a-Fe),[110]_(9R)//[111]_(a=Fe). The precipitation sequence of copper precipitate in the ultrapure ferritic stainless steel is bcc→9 R→3 R→ fcc.
作者
尹鸿祥
吴毅
张关震
李翔
张澎湃
赵爱民
Yin Hongxiang;Wu Yi;Zhang Guanzhen;Li Xiang;Zhang Pengpai;Zhao Aimin(China Academy of Railway Sciences Co.,Ltd,Beijing 100081,China;University of Science and Technology Beijing,Beijing 100083,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2021年第2期658-663,共6页
Rare Metal Materials and Engineering
基金
国家重点研发计划(2017YFB0304600)。
关键词
超纯铁素体不锈钢
铜析出相
Ostwald熟化
晶体结构
ultrapure ferritic stainless steel
copper precipitated phase
Ostwald ripening
crystal structure
作者简介
尹鸿祥,男,1986年生,博士,副研究员,中国铁道科学研究院集团有限公司金属及化学研究所,北京100081,电话:010-51849354,E-mail:yhxlloy1314920@yeah.net。
