Advanced Assessment of Ductile Tearing in Nuclear Reactor Pressure Vessel Steel Using X-ray Tomography
Reactor pressure vessels (RPV) are manufactured from medium strength low allow ferritic steel specifically selected of its high toughness and weldability.The ability of the RPV to withstand crack propagation is crucial to maintaining the operational safety of the reactor plant.Current generations of RPV steels operate at sufficiently high temperatures to ensure that the material remains ductile during its service life.Furthermore,new materials are engineered to exhibit greater ductility and fracture toughness throughout their operating life.Therefore understanding and being able to predict the ductile fracture behaviour is critical for assuring the safety of RPV steels during operating conditions.This paper presents the results of an experimental programme aimed at using 3D X-ray tomography to quantify the volume fraction of ductile voids in tested pre-cracked specimens manufactured from A508 Class 3 RPV steel.The results indicate a high concentration of voids very close to the fracture surface and voids extending 3.6mm below the crack.The data and experimental methodology could be used to calibrate predictive mechanistically based models such as the Gurson-Tvergaard-Needlman (GTN).
Ductile Tearing Steel X-ray Tomography
Michael Daly Fabien Leonard John K Sharples Andrew H Sherry
Dalton Nuclear Institute,The University of Manchester,Pariser Building-G Floor,Sackville Street,Manc AMEC Technical Services,Walton House,Birchwood Park,Warrington,Cheshire,WA3 6AT,UK
国际会议
北京
英文
1-11
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）