Zr-Sn-Nb新型锆合金板材加工过程中不均匀组织与织构演变

陈建伟; 栾佰峰; 柴林江; 余泓冰; 刘庆; 周军; 李中奎

doi:10.3724/SP.J.1037.2011.00809

金属学报 >

2012 , Vol. 48 >Issue 4: 393 - 400

DOI: https://doi.org/10.3724/SP.J.1037.2011.00809

论文

Zr-Sn-Nb新型锆合金板材加工过程中不均匀组织与织构演变

陈建伟 ,
栾佰峰 ,
柴林江 ,
余泓冰 ,
刘庆 ,
周军 ,
李中奎

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1.重庆大学材料科学与工程学院, 重庆 400044
2.西北有色金属研究院, 西安 710016

陈建伟, 男, 1984年生, 博士生

收稿日期: 2011-12-28

修回日期: 2012-02-26

网络出版日期: 2012-04-11

基金资助

国家自然科学基金项目51171213, 中央高校基本科研业务费专项资金项目CDJZR10130008和CDJXS10132201, 教育部新世纪优秀人才支持计划项目NCET-08-0606和重庆市百名杰出科技领军人才培养计划项目资助

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HETEROGENEOUS MICROSTRUCTURE AND TEXTURE EVOLUTION DURING FABRICATION OF Zr-Sn-Nb ZIRCONIUM ALLOY SHEETS

CHEN Jian-Wei ,
LUAN Bai-Feng ,
CI Lin-Jiang ,
YU Hong-Bing ,
LIU Qiang ,
ZHOU Jun ,
LI Zhong-Kui

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1.College of Materials Science and Engineering, Chongqing University, Chongqing 400044
2.Northwest Institute for Nonferrous Metal Research, Xi'an 710016

Received date: 2011-12-28

Revised date: 2012-02-26

Online published: 2012-04-11

Supported by

Chongqing Leading Scientist Program;National Natural Science Foundation of China;Fundamental Research Funds for the Central Universities;Fundamental Research Funds for the Central Universities

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摘要

利用XRD, SEM-ECC, TEM和EBSD技术, 研究了Zr-Sn-Nb系新型锆合金板材加工过程的微观组织及织构演变. 结果表明, β相淬火得到的随机织构经热轧后形成沿横向倾斜的基面织构, 随后的加工过程均保留该织构;热轧及两次冷轧后的基面织构都为<1010>方向平行于轧向(<1010>//RD), 而退火后转变为<1210>方向平行于轧向(<1210>//RD).淬火形成的网状魏氏组织经热轧转变为不均匀形变组织, 两次冷轧使组织的不均匀性更显著, 最终退火得到完全再结晶组织; 轧制形成的难变形晶粒多为晶粒C轴平行于轧板法向(C//ND)的取向; 最终退火板材的大晶粒多为<1210>//RD的基面织构, 小晶粒则以<1010>//RD为主. 结合锆合金的变形及再结晶机制对轧制时产生的不均匀组织及再结晶过程的织构转变进行了分析.

关键词： Zr-Sn-Nb合金; 微观组织; 织构; 不均匀形变组织; 再结晶

本文引用格式

陈建伟 , 栾佰峰 , 柴林江 , 余泓冰 , 刘庆 , 周军 , 李中奎 . Zr-Sn-Nb新型锆合金板材加工过程中不均匀组织与织构演变[J]. 金属学报, 2012 , 48(4) : 393 -400 . DOI: 10.3724/SP.J.1037.2011.00809

Abstract

Zirconium alloys are widely used as fuel cladding and structural materials for nuclear reactors due to the low neutron absorption cross-section, good corrosion resistance and acceptable mechanical properties. These properties are greatly dependent on microstructural and textural features, such as grain morphology, grain size, crystallographic texture and distribution of precipitates. It is necessary to understand microstructure and texture evolution during fabrication in order to optimize the manufacturing process and to improve the service performance. In this work, microstructure and texture evolution during fabrication of Zr-Sn-Nb new zirconium alloy sheets are investigated using XRD, SEM-ECC, TEM and EBSD. The results show that the random texture formed by β quenching transforms into tilt basal texture after hot rolling. The basal texture keeps stable during the following fabrication stages. The texture of the rolling sheets is mainly characterized as <1010> direction parallel to rolling direction (<1010>//RD), while the texture of the annealing sheets is <1210> direction parallel to rolling direction (<1210>//RD). The microstructure evolves from a weave Widmansatten structure of β quenching stage to heterogeneous deformation structures associated with hot and cold rolling and then to a fully recrystallized structure after final annealing. The cold rolling sheets present more heterogeneous structures in which the C axes of less deformed grains mostly concentrate in the normal direction. The larger grains in annealed structures mostly belong to the <1210>//RD basal texture while the smaller grains are in the <1010>//RD orientation. The reason for the heterogeneous deformation structures and texture evolution during annealing are discussed according to the deformation and recrystallization mechanisms.

Key words： Zr-Sn-Nb alloy; microstructure; texture; heterogeneous deformation structure; recrystallization

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