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- Title
Crystal plasticity finite element model of the brittle–ductile transition temperature and fracture toughness of irradiated A508-3 steel.
- Authors
Lin, Pan-dong; Nie, Jun-feng; Liu, Mei-dan; Chen, Yuan
- Abstract
The brittle–ductile transition temperature (BDTT) and fracture toughness are useful indicators of the brittleness of reactor pressure vessel materials. However, current methods to analyze these parameters are expensive and time-consuming; moreover, the relevant mechanism is not very clear. Thus, in this study, a body-centered cubic crystal plasticity finite element model (CPFEM) based on the densities of dislocation and irradiation defects, which are full- and partial-absorption dislocation loops, was numerically implemented on A508-3 steel. Irradiation embrittlement was investigated in the CPFEM framework. The cleavage failure model for a representative volume element was proposed to calculate the BDTT, the results of which agreed well with experimental results in the literature for both unirradiated and irradiated samples. The risk for brittle failure is higher for irradiated samples at constant temperature. Furthermore, the proposed model combined with the Beremin cleavage fracture local approach, could estimate the fracture toughness of A508-3 steel at different temperatures before and after irradiation. The results obtained were consistent with reported experimental data, indicating that irradiation exacerbates the embrittlement. This work is beneficial to the calculation and evaluation of irradiation effect of RPV steel, providing reference for the research of reactor life extension.
- Subjects
FINITE element method; TRANSITION temperature; DISLOCATION loops; BODY centered cubic structure; RESEARCH reactors; FRACTURE toughness; BRITTLENESS
- Publication
Applied Physics A: Materials Science & Processing, 2024, Vol 130, Issue 2, p1
- ISSN
0947-8396
- Publication type
Article
- DOI
10.1007/s00339-023-07252-2