热老化对AP1000主泵泵壳动态断裂韧性影响研究  

Thermal aging effect on dynamic fracture toughness of AP1000 main pump casing

作　　者：李世伟 余伟炜[2] 蒙新明[2] 薛飞[3] 陈巍峰[4] 

机构地区：[1]中核核电运行管理有限公司,浙江海盐314300 [2]苏州热工研究院有限公司,江苏苏州215004 [3]清华大学材料科学与工程系,北京100084 [4]天津大学化工学院,天津300072

出　　处：《中国测试》2014年第5期130-134,共5页China Measurement & Test

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)

摘　　要：为研究热老化对AP1000主泵泵壳的制造材料——铸造奥氏体不锈钢CF8的动态断裂韧性的影响,采用夏比预裂纹试样,利用示波落锤冲击试验系统研究材料动态断裂韧性随老化时间的变化规律。试验结果表明:400℃下的加速热老化使主泵泵壳材料产生明显的脆化效应,降低材料断裂所需消耗的能量;热老化导致材料动态裂纹扩展阻力曲线下降,对应的动态断裂韧度下降,但在热老化前期短时间内阻力曲线下降程度较大,而在热老化时间>500h后降幅逐渐减小,出现老化饱和迹象。In order to investigate the effect of thermal aging on dynamic fracture toughness of cast austenitic stainless steel typed CF8 material, which is used as the AP1000 main pump casing material,a series of falling weight impact test was conducted on pre-crack specimens. Test results show that there is an obvious embrittlement effect on this steel when it was aged at 400?C for up to 3 000 hours. During the impact process, the absorbed energy decreases with the aging time increases. In addition,dynamic crack growth resistance curve descends,and it is found that there is a great descending in the early aging stage,while the amplify decreases after aged 500 hours when a saturation occurs.

关 键 词：铸造奥氏体不锈钢 泵壳 热老化 动态断裂韧性 

分 类 号：TL353.12[核科学技术—核技术及应用]