Zirconium alloy ingot casting alloy element adding method

Abstract

The invention discloses a zirconium alloy ingot casting alloy element adding method. The method comprises the steps that 1, a zirconium raw material and an alloy element raw material are prepared; 2,raw materials of the alloy elements are selected, weighed and then wrapped into bags through zirconium foil, and a plurality of intermediate alloy bags are obtained; 3, a plurality of intermediate alloy bags are arranged between two layers of sponge zirconium and pressed to obtain electrode blocks; 4, the electrode blocks are welded to obtain a consumable electrode; and 5, vacuum consumable arc melting is carried out on the consumable electrode to obtain zirconium alloy cast ingot. The zirconium foil is used for wrapping the alloy element raw material to prepare the intermediate alloy bags, and the zirconium foil at the front end of the electrode is high in melting point in the smelting process and is not prone to melting too early and flowing into a molten pool; and the distribution uniformity of all elements in the zirconium alloy cast ingot is guaranteed, meanwhile, alloy raw materials do not need to be alloyed in advance, the procedures of alloy bag pressing and alloy buckle smelting are omitted, the technological process is shortened, tungsten electrode pollution caused by alloy buckle smelting is avoided, the labor intensity is reduced, and the method is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of preparation of zirconium alloy ingots, and in particular relates to a method for adding alloy elements to zirconium alloy ingots. Background technique [0002] Zirconium alloys are key structural materials for nuclear reactor cores. A variety of zirconium alloys have been developed at home and abroad for different nuclear reactor conditions, such as ZIRLO alloys, Zr-4 alloys, and Zr-2 alloys. There are many types of alloying elements in various types of zirconium alloys and their contents vary greatly. The alloying elements contained include Sn, Fe, Cr, Nb, Ni, etc. The alloy composition in the ingot is mainly regulated by the addition of the above-mentioned intermediate alloying elements. At present, the most widely used method of adding master alloy is to add it in the form of nearly alloyed master alloy buckle. The preparation process of the master alloy buckle is relatively long, and it needs to be p...

AI Technical Summary

Problems solved by technology

In order to ensure the uniformity of the composition of a single alloy buckle, the weight of a single alloy buckle is small, about 40g, resulting in a large number of alloy buckles that need to be prepared for conventional 3t grade zirconium alloy ingots, more than 1000, each alloy buckle Buckles contain all kinds of intermediate alloy elements required for ingot casting, manual weighing needs about 5000 times, and the workload of weighing and data recording is relatively large

At the same time, the smelting process of the intermediate alloy buckle is realized by tungsten argon arc welding torch, which has a high labor intensity and the risk of tungsten sticking on the surface of the alloy buckle

Therefore, there are disadvantages such as heavy weighing workload, large amount of data recording, high labor intensity, long production cycle, low efficiency, and high quality risk in the entire alloy buckle preparation process, which increases production costs and is not conducive to large-scale industrial production.

At the same time, when the pure metal is directly wrapped with tin for cloth, the preheating temperature reached by the front end of the electrode far exceeds the melting point of tin, causing tin to flow into the molten pool prematurely, which may easily cause tin segregation and other disadvantages

Uniformity of tin throughout the ingot cannot be guaranteed

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