TY - JOUR
T1 - Effect of SieNieP on the emergence of dislocations loops in Fee9Cr matrix under neutron irradiation: TEM study and OKMC modelling
AU - Dubinko, Andrii
AU - Castin, Nicolas
AU - Terentyev, Dmitry
AU - Bonny, Giovanni
AU - Konstantinovic, Milan
N1 - Score=10
PY - 2020/7/15
Y1 - 2020/7/15
N2 - The expected degradation of mechanical properties of structural materials under irradiation (i.e. “in operation”) in nuclear components represents a significant challenge for the design to account the impact of long-term irradiation effects. Therefore, a development of scientific and engineering expertise to understand and possibly control the severe impact of harsh neutron irradiation on materials is one of the tasks in the current material’s research agenda. As it is well known from long-standing experience with fission systems, radiation embrittlement is caused by nano-scale features that obstruct plasticity mediated by dislocations. The present contribution highlights recent research and development efforts addressed towards the assessment of the interrelation between nano-structural features and hardening induced by neutron irradiation in fusion structural high-Cr ferritic/martensitic steels. In this work, the impact of doping by three chemical elements (nickel, silicon and phosphorus) on the microstructural evolution under neutron irradiation at 300 C and 450 C is studied experimentally as well as by computer simulations. The evolution of microstructure is assessed by transmission electron microscopy and object kinetic Monte Carlo simulations. The latter method utilizes a new approach enabling to follow both nano-scale irradiation defects and micro-segregation zones causing the formation of solute rich clusters, detectable by atom probe tomography. The results of the present work clearly point out that NieSi segregation alters the spatial and size distribution of dislocations loops already at as low dose
AB - The expected degradation of mechanical properties of structural materials under irradiation (i.e. “in operation”) in nuclear components represents a significant challenge for the design to account the impact of long-term irradiation effects. Therefore, a development of scientific and engineering expertise to understand and possibly control the severe impact of harsh neutron irradiation on materials is one of the tasks in the current material’s research agenda. As it is well known from long-standing experience with fission systems, radiation embrittlement is caused by nano-scale features that obstruct plasticity mediated by dislocations. The present contribution highlights recent research and development efforts addressed towards the assessment of the interrelation between nano-structural features and hardening induced by neutron irradiation in fusion structural high-Cr ferritic/martensitic steels. In this work, the impact of doping by three chemical elements (nickel, silicon and phosphorus) on the microstructural evolution under neutron irradiation at 300 C and 450 C is studied experimentally as well as by computer simulations. The evolution of microstructure is assessed by transmission electron microscopy and object kinetic Monte Carlo simulations. The latter method utilizes a new approach enabling to follow both nano-scale irradiation defects and micro-segregation zones causing the formation of solute rich clusters, detectable by atom probe tomography. The results of the present work clearly point out that NieSi segregation alters the spatial and size distribution of dislocations loops already at as low dose
KW - Ferritic steel
KW - Precipitation
KW - Irradiation
KW - TEM
KW - Modelling
UR - https://ecm.sckcen.be/OTCS/llisapi.dll/open/39665121
U2 - 10.1016/j.jnucmat.2020.152395
DO - 10.1016/j.jnucmat.2020.152395
M3 - Article
SN - 0022-3115
VL - 540
SP - 1
EP - 14
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
M1 - 152395
ER -