A nano-scale oxide reinforced low-activation steel composite material and its preparation method

Abstract

The invention discloses a nanoscale oxide-reinforced low-activation steel composite material and a preparation method thereof, comprising the following process: nanoscale Y 2 o 3 , Nanoscale Al 2 o 3 Carry out solid solution by ball milling with nanoscale particle A to obtain solid solution A, and the nanoscale particle A is nanoscale TiO 2 and / or nanoscale ZrO 2 ; The solid solution A is hollowed out and etched with NaOH solution, and then washed and dried to obtain the solid solution B; the solid solution B is ball-milled and mixed with the low-activation steel powder to obtain the mixture C; the mixture C is processed by using a selective laser melting process molding to obtain a molded body; performing stress relief annealing on the molded body. The present invention first prepares complex rare earth oxides, adjusts its structure to improve its wettability with low-activation steel, optimizes its dosage and size, and distributes them evenly on low-activation steel through laser melting technology In the matrix, significantly improving the strength of low-activation steel is of great significance for improving the safety of fusion reactors.

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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