摘要
低活性铁素体/马氏体钢,JLF-1,是聚变堆和超临界水冷堆的候选结构材料,高温循环软化现象是设计必须考虑的因素之一.为掌握JLF-1钢高温循环变形机理,本文采用透射电镜对JLF-1钢高温低周疲劳后样品的微观结构进行了分析,发现JLF-1钢的循环软化现象与位错密度、位错胞、板条宽度有关;其峰值拉应力与位错密度、板条宽度呈函数关系.
A reduced activation ferritic/martensitic steel, JLF- 1, is considered as one of the candidate alloys for the structure components in their applications such as the fusion reactors and super critical water reactors. However, the cyclic softening property of the steel is one of the key issues for its application. To investigate the mechanism of cyclic softening, the microstructure of steel JI.F- 1 after low cyclic deformation was analyses by TEM. The images of TEM of △E, ： 1. 8% at RT, 673 K and 873 K respectively showed that the cyclic softening property is caused by reduction of the dislocation density, formation and loss of cell structure, and increment of lath width.
出处
《南京大学学报（自然科学版）》
CAS
CSCD
北大核心
2009年第2期252-257,共6页
Journal of Nanjing University（Natural Science）
基金
973国家重点基础研究发展计划(2007CB209801)
关键词
低活性铁素体/马氏体钢
循环变形
微观结构
循环软化
reduced-activation, ferritic/martensitic steel, cyclic deformation, microstructure, cyclic softening
