摘要
为了研究主泵泵壳材料CF8在室温和350℃下的形变强化行为以及热老化对于料形变强化的影响,在恒应变速率控制模式下,通过对原始态和不同热老化时间后的试样进行室温和350℃下的准静态拉伸试验。结果表明,主泵泵壳材料CF8在拉伸过程中变形是不均匀的;随热老化时间延长,材料在室温和350℃的抗拉强度均不断提高,断后伸长率有所下降;在室温和350℃下的形变强化均呈阶段性,应变硬化指数在变形中逐渐增加,在第一阶段增幅最为明显。
In order to investigate the effect of thermal aging on mechanical-hardening behavior of CF8 cast stainless steel for reactor coolant pump( RCP) case material,static tensile experiments of the as-received and thermal aged CF8 steel at room temperature and 350 ℃ were carried out at a constant strain rate. The results show that the distribution of strain in the gauge length of the specimen is not uniform during tensile. With the increasing thermal aging time,the tensile strength of the steel gradually increases,but the elongation percentage changes reversely. The staged mechanical-hardening behavior of the steel at room temperature and 350 ℃ is observed and the n-values of each stage increase gradually during the deformation with the increasing thermal aging time,especially for the first stage.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2015年第2期10-16,共7页
Transactions of Materials and Heat Treatment
基金
国家科技重大专项(2011ZX06004-009-08)
江苏省国际科技合作计划项目(BZ2012026)
