A deep subcooling treatment method for fine-grained copper alloy liner

Abstract

The invention provides a preparation method of a fine grain copper alloy shaped charge liner. The preparation method of the fine grain copper alloy shaped charge liner comprises the following steps: carrying out compound cold extrusion plastic deformation, carrying out deep overcooling treatment, and carrying out recrystalization annealing, wherein the compound cold extrusion plastic deformation comprises the steps of putting a blank into a mould cavity of a preformed blank forming mould, carrying out forward extrusion forming to obtain a designed copper alloy preformed blank under the actions of three-dimensional compressive stress and deformation rate and then putting the preformed blank into a mould cavity of a shaped charge liner forming mould and gradually forming the shaped charge liner preformed blank by carrying out gradual-pass diameter-expanded extrusion plastic deformation, thus obtaining the shaped charge liner blank of a required shape structure; the deep overcooling treatment comprises the step of carrying out heat preservation on the shaped charged liner blank for 2-4 hours at the temperature ranging from -196 DEG C to 130 DEG C; and the recrystallization annealing comprises the step of carrying out heat preservation on the shaped charge liner (subjected to deep overcooling treatment) for 5-15 minutes at the temperature of 450-550 DEG C in a protective atmosphere, thus obtaining a shaped charge liner component. The preparation method of the fine grain copper alloy shaped charge liner has the advantages that strict requirements of the shaped charge liner on grain structure homogeneity, consistency of performance and stress state and distribution can be met, and quality of the shaped charge liner can be improved.

Description

technical field [0001] The invention belongs to metal heat treatment technology, in particular to a heat treatment technology applied to copper alloy drug-type covers. Background technique [0002] A typical shaped charge jet has a high head velocity and a low tail velocity, and this velocity gradient makes the jet drawn very long at a considerable blast height. The penetrating ability of the jet is proportional to the length of the continuous jet, but the length of the continuous jet is limited because the jet eventually breaks into segments of particles in the axial direction. Once the jet breaks into particles, its penetrating ability decreases. Research institutions at home and abroad have done a lot of in-depth research on the relationship between the internal structure, manufacturing process and armor-piercing performance of the drug-shaped cover. The research shows that the grain size, grain orientation and other intrinsic performance parameters of the drug-shaped m...

AI Technical Summary

Problems solved by technology

Composite cold extrusion forming + conventional heat treatment process manufacturing method can form a line with fine grains and good geometric symmetry, but when the copper alloy line Thickness decreases and the forming pressure per unit area increases, and the internal stress of the liner is relatively high. At the same time, because the liner is mostly cone-shaped, butterfly-shaped, etc., the deformation of the entire forming process is uneven, which easily leads to uneven distribution of forming stress. The grain structure of the medicine mask is in a metastable state

Due to the metastable structure caused by uneven stress distribution, there are three difficulties in the manufacture of fine-grained drug-type masks: one is that in the conventional heat treatment process, the secondary recrystallization of the high-stress area is easy to form a mixed crystal structure; the other is the follow-up During the finishing process, the stress is released and deformed, the coaxiality is greater than 0.1mm, and the wall thickness difference is greater than 0.05mm; the third is uneven stress distribution, which affects the collimation and continuity of the energy-enhancing jet

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