TY - JOUR
T1 - Effect of irradiation-induced plastic flow localization on ductile crack resistance behavior of a 9%Cr tempered martensitic steel
AU - Chaouadi, Rachid
A2 - Maes, Dirk
N1 - Score = 10
PY - 2008/1/31
Y1 - 2008/1/31
N2 - This paper examines the effect of irradiation-induced plastic flow localization on the crack resistance behavior. Tensile and crack resistance measurements were performed on Eurofer-97 that was irradiated at 300 °C to neutron doses ranging between 0.3 and 2.1 dpa. A severe degradation of crack resistance behavior is experimentally established at quasi-static loading, in contradiction with the Charpy impact data and the dynamic crack resistance measurements. This degradation is attributed to the dislocation channel deformation phenomenon. At quasi-static loading rate, scanning electron microscopy observations of the fracture surfaces revealed a significant change of fracture topography, mainly from equiaxed dimples (mode I) to shear dimples (mode I + II). With increasing loading rate, the high peak stresses that develop inside the process zone activate much more dislocation sources resulting in a higher density of cross cutting dislocation channels and therefore an almost unaffected crack resistance. These explanations provide a rational to all experimental observations.
AB - This paper examines the effect of irradiation-induced plastic flow localization on the crack resistance behavior. Tensile and crack resistance measurements were performed on Eurofer-97 that was irradiated at 300 °C to neutron doses ranging between 0.3 and 2.1 dpa. A severe degradation of crack resistance behavior is experimentally established at quasi-static loading, in contradiction with the Charpy impact data and the dynamic crack resistance measurements. This degradation is attributed to the dislocation channel deformation phenomenon. At quasi-static loading rate, scanning electron microscopy observations of the fracture surfaces revealed a significant change of fracture topography, mainly from equiaxed dimples (mode I) to shear dimples (mode I + II). With increasing loading rate, the high peak stresses that develop inside the process zone activate much more dislocation sources resulting in a higher density of cross cutting dislocation channels and therefore an almost unaffected crack resistance. These explanations provide a rational to all experimental observations.
KW - martensitic steel
KW - crack resistance
KW - Charpy impact
KW - dislocation channel deformation
KW - irradiation
UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/ezp_85055
UR - http://knowledgecentre.sckcen.be/so2/bibref/4674
U2 - 10.1016/j.jnucmat.2007.04.044
DO - 10.1016/j.jnucmat.2007.04.044
M3 - Article
SN - 0022-3115
VL - 372
SP - 379
EP - 390
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
IS - 2-3
ER -