压力容器Issue(5)：23-29,12,8.DOI:10.3969/j.issn.1001-4837.2014.05.003
热老化对主泵泵壳材料失效评定曲线的影响研究
Research on Thermal Aging Effect on Failure Assessment Curve of Nuclear Coolant Pump Casing Material
摘要
Abstract
The effects of thermal aging on tensile properties and failure assessment curves were studied for casting autenitic stainless steel CF8,which is used for the reactor coolant pump casing.Static tensile tests on samples with different thermal aging time were conducted with a constant strain rate.Then,a model of Ramberg-Osgood was used to analyze true stress-strain curves.Finally,the fitted parameters of R-O formula were used to calculate the failure assessment curve (FAC ).The results show that the tensile strength of material gradually increased while the elongation percentage changed reversely with the ther-mal aging time increasing at both room temperature and 350 ℃.The curve calculated by R-O model fits well with the true stress-strain curve when the loading strain is small.Failure assessment curves for ma-terial with different aging time were calculated by R6 option 2 method.It was found that the FAC for un-aged material is not reliable for thermal aged material in some cases.关键词
主泵泵壳/热老化/Ramberg-Osgood模型/真应力-应变曲线/失效评定曲线Key words
pump casing/thermal aging/Ramberg-Osgood model/true stress-strain curve/failure as-sessment curve分类
机械制造引用本文复制引用
余伟炜,田阳,薛飞,蒙新明..热老化对主泵泵壳材料失效评定曲线的影响研究[J].压力容器,2014,(5):23-29,12,8.基金项目
国家科技重大专项（2011ZX06004-009-08）；江苏省国际科技合作计划项目 （）
