基于PCVN小试样评估主管道的动态断裂韧性研究  

Evaluation of Dynamic Fracture Toughness of Primary Pipeline Material Basedon PCVN Small Sample

作　　者：刘二伟[1] 贾文清 薛飞[1] 范敏郁 於旻 余伟炜[1] LIU Erwei;JIA Wenqing;XUE Fei;FAN Minyu;YU Min;YU Weiwei(Suzhou Nuclear Power Research Institute,Suzhou 215004,China)

机构地区：[1]苏州热工研究院有限公司,苏州215004

出　　处：《材料导报》2020年第S02期418-422,共5页Materials Reports

摘　　要：针对CPR1000+机组反应堆一回路主管道在服役过程中存在的典型热老化问题,基于55 mm×10 mm×10 mm的预制裂纹冲击(PCVN)样品,结合全场应变测试技术(DIC)研究了主管道动态断裂韧性随服役时间变化的规律。通过实验获得动态载荷-位移曲线及不锈钢的动态裂纹扩展阻力曲线(动态J-R曲线),并和准静态断裂韧性变化趋势做了比较。结果表明,热老化后导致主管道材料发生明显的脆化,断裂韧性随热老化时间延长而明显下降。In view of the typical thermal aging phenomenon of primary coolant pipes during service in CPR1000+unit,the influence of thermal aging time on dynamic fracture toughness of primary coolant piping materials were investigated by the 55 mm×10 mm×10 mm pre-crack impact(PCVN)sample,combined with 3D digital image correlation(DIC).The dynamic crack growth resistance curves(dynamic J-R curve)of the base metal were obtained based on the dynamic load-displacement curves by the key curve method and load separation method,and then compared with the quasi-static fracture toughness variation tendency,and it is found that,there is an obvious embrittlement in primary pipeline mate-rial after thermal aging.

关 键 词：主管道 热老化 PCVN 动态断裂韧性 DIC 

分 类 号：TB301[一般工业技术—材料科学与工程]