Efficient preparation method for nanostructure oxide dispersion strengthening steel

Abstract

The invention aims at providing an efficient preparation method for nanostructure oxide dispersion strengthening steel, which adopts an atomization method for direct preparation(for one step) of powder solid solution alloy containing supersaturation solid solution of Y and Ti, so that conventional process for long-time mechanical alloying ball-milling between mother alloy(free of Y and Ti) atomization powder process as well as atomized powder and Y2O3 and Ti is replaced, and necessary microstructure is provided for forming high density nanostructure rich Y-Ti-O precipitated phase in follow-up process. According to the method, the preparation process is simplified, and bad microstructures such as non-nanostructure precipitated phase and the like and degradation of material property caused by long-time ball milling in existing process can be controlled or prevented, the obdurability and radiation resistance and helium fragility resistance of the material can be improved, so that the operation requirement of key structure material of core parts on advanced nuclear reactor is satisfied.

Description

technical field [0001] The invention relates to the preparation technology of high-temperature-resistant, high-strength, and radiation-resistant alloys for core components of fourth-generation nuclear reactors (fast reactors), and in particular provides an efficient preparation method for nanostructured oxide dispersion-strengthened steel. Background technique [0002] my country has determined the "three-step" nuclear power development strategy from thermal neutron reactor (pressurized water reactor) to fast neutron reactor (fourth generation nuclear reactor) to fusion reactor. Fast reactors can make full use of U-238, which cannot be used by thermal reactors and accounts for the vast majority of uranium resources, through fast neutron technology and the corresponding closed cycle of nuclear fuel, so that the utilization rate of uranium resources can be increased by 60 times, and the volume and toxicity of nuclear waste can be reduced by 10. It is estimated that commercial ...

AI Technical Summary

Problems solved by technology

Since repeated dislocation cutting is required to achieve Y 2 o 3 The solid solution of Y and O contained in the alloy requires dozens to more than one hundred hours of long-term mechanical alloying ball milling. In addition to low efficiency and high cost, the pollution that occurs during the ball milling process (including the introduction process) cannot be avoided. Too much oxygen and pollution from tanks and ball mills), too much oxygen leads to the suppression of the formation of nanoscale Y-Ti-O-rich precipitates in the subsequent thermal solidification process, and tends to form coarser ( Tens, hundreds of nanometers) equilibrium oxide phase (such as TiO 2 etc.), the appearance of these larger equilibrium oxide phases deteriorates the properties, thereby affecting the successful preparation of high-performance nanostructured oxide dispersion-strengthened steels