Abstract
In this study, 3.5 MeV Fe-ion irradiation experiments were conducted on F321 austenitic stainless-steel at different temperatures and doses. The nanohardness of the unirradiated and irradiated samples was characterized by performing nanoindentation experiments. Irradiation softening and hardening were clearly observed at 20, 100, and 300°C. However, at 300°C, after irradiation softening, the nanohardness first increased and then decreased, as opposed to the nanohardness at 20 and 100°C, which increased as the dose increased. In addition, a crystal plasticity model for a face-centered cubic single-crystal while considering irradiation-induced hardening has been proposed and numerically implemented in the user-material subroutine UMAT of ABAQUS. This was done to simulate the load-depth data of the nanoindentation experiment. The simulated results of the non-irradiated and irradiated F321 austenitic stainless-steel were compared with the experimental data. A good agreement was observed, which demonstrates the effectiveness and accuracy of the model.
Highlights
F321 is an austenitic stainless-steel that is strengthened by the precipitation of TiC with the addition of Ti that is based on 304 austenitic stainless-steel
There is another part of the H − D curve in which the nanohardness increases with the depth, which is known as reverse indentation size effect (ISE)
We only simulated the results of the nanoindentation experiments on a F321 austenitic stainless-steel sample that was irradiated at room temperature (20°C) and a high temperature (300°C) with a dose of 2.85 dpa
Summary
F321 is an austenitic stainless-steel that is strengthened by the precipitation of TiC with the addition of Ti that is based on 304 austenitic stainless-steel. Molecular dynamics (MD) and dislocation dynamics (DD) have studied defect-dislocation interactions at the atomic scale and mesoscopic dislocation scale, respectively, and they have derived the evolution laws of the microstructures Neither of these simulations can directly link the irradiation defects to the macroscopic mechanical behavior. The nanoindentation technique is applied to measure the mechanical properties of F321 austenitic stainlesssteel (F321 SS) that is irradiated with 3.5 MeV Fe ions at different temperatures and doses. We developed a crystal plasticity model for the FCC crystals that considered the effects of the dislocations and irradiation hardening This model was applied with the finite element platform ABAQUS (Hibbitt and Sorensen, 2005) to determine the nanohardness of F321 austenitic stainless-steel under different irradiation conditions
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