Nanoscale oxide reinforced low-activation steel composite material and preparation method thereof

Abstract

The invention discloses a nanoscale oxide reinforced low-activation steel composite material and a preparation method thereof. The preparation method comprises the following steps that nanoscale Y2O3, nanoscale Al2O3 and nanoscale particles A are subjected to ball milling solid solution to obtain a solid solution A, and the nanoscale particles A are nanoscale TiO2 and / or nanoscale ZrO2; hollow erosion is carried out on the solid solution A by using a NaOH solution, and then washing and drying are carried out to obtain a solid solution B; the solid solution B and low-activation steel powder are subjected to ball milling and mixing, and a mixture C is obtained; the mixture C is formed by adopting a selective laser melting process to obtain a formed body; and stress relief annealing is carried out on the formed body. According to the nanoscale oxide reinforced low-activation steel composite material and the preparation method thereof provided by the invention, the complex rare earth oxide is firstly prepared, the structure of the complex rare earth oxide is adjusted to improve the wettability of the complex rare earth oxide and low-activation steel, the dosage and size of the complex rare earth oxide are optimized, the complex rare earth oxide is evenly distributed in a low-activation steel matrix through the laser melting technology, the strength of the low-activation steel is remarkably improved, and the preparation method has important significance for improving the safety of a fusion reactor.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and specifically relates to a nano-scale oxide-reinforced low-activation steel composite material and a preparation method thereof. Background technique [0002] Due to its good low activation properties, radiation swelling resistance, mechanical properties, thermophysical properties, and better resistance to radiation creep and fatigue, low-activation steel is considered to be the first choice for the cladding of the first wall of a fusion reactor. Preferred material of construction. However, with the development of nuclear power technology, higher requirements are put forward for its mechanical properties. In order to improve the high-temperature mechanical properties and helium embrittlement resistance of low-activation steels, rare earth oxides (Y 2 o 3 , Y-Al-O, Y-Ti-O and Y-Zr-O) were introduced into the steel. The fine and complex rare earth oxide particles dispersed ...

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Problems solved by technology

[0003] At present, strengthening particles are usually introduced by powder metallurgy process, but this process has disadvantages such as complex process, poor economy, and industrial production limitations.

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