A method capable of improving the radiation resistance of steel used in nuclear power plant reactors
A nuclear power plant reactor and anti-irradiation technology, which is applied in the field of improving the anti-irradiation performance of steel used in nuclear power plant reactors, and can solve the problems of reduced safety of nuclear reactor vessels, easy changes in microstructure properties and macroscopic mechanical properties, hardening and embrittlement, etc.
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Embodiment 1
[0039] A domestically produced A508-3 steel plate with a thickness of 12.6mm and a width of 81mm was selected, and cold-rolled five times on a two-roll reversing rolling mill to a thickness of 6.3mm, each time being uniformly pressed down in the same proportion. Calculated according to the selected steel thickness, the amount of pressing down each time in this embodiment is 13% [12.6*(1-13%) 5 ≈6.3]. The samples after cold rolling were annealed at 260°C for 4 hours to remove the vacancies generated during the cold rolling process and avoid affecting the characterization results of the subsequent positron annihilation experiments.
[0040] When the deformation amount is 30% and 60%, it is similar to the above process. But when the deformation amount is 30%, the deformation amount is small, and the cold rolling can be completed in three times, and the pressure is uniformly pressed down according to the same ratio each time; when the deformation amount is 60%, the cold rolling c...
Embodiment 2
[0044] The difference from Embodiment 1 is that in this embodiment, the material is subjected to single extrusion by equal channel angular extrusion to produce 50% deformation. The sample is extruded from one channel to another. When passing through the intersection of the two channels, the sample undergoes an approximately ideal pure shear deformation. Repeated extrusion can make the material obtain a greater amount of deformation and the grains can be finer. change. In this embodiment, the inner angle β of the extrusion die is set to 90°, and the outer angle φ is set to 20° to avoid dead zones. refer to Figure 4 , the inner angle refers to the included angle between the axes of two cylindrical equal passages, and the outer angle refers to the included angle between the corner transition sections of two cylindrical equal passages. When the deformation amount is 30%, 60% and 80%, it is similar to the above process.
Embodiment 3
[0046] The difference from the second embodiment is that in this embodiment, the equal channel angular extrusion is used to extrude the material three times to produce 50% deformation. Extruding in three steps can prevent the deformation of the material during extrusion from being too severe, resulting in instability of the obtained tissue. In this example, the inner angle β of the extrusion die is set to 150°, the outer angle φ is set to 0°, and B is selected when the direction and angle of the sample are rotated. C path. Low-temperature annealing is performed between each extrusion to stabilize the structure. Of course, the number of extrusions is not limited to three times, and the number of extrusions can also be increased or decreased according to the amount of deformation. When the deformation amount is 30%, 60% and 80%, it is similar to the above process.
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Abstract
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