A kind of forging deformation and heat treatment method of cucrte metal profile

Abstract

The invention discloses a forging deformation and heat treatment method of a CuCrTe metal profile, belonging to the technical field of forging technology. The present invention is aimed at CuCrTe series contact materials, removes defects such as cold shut, enrichment, and inclusions before forging, and at the same time adopts solid solution treatment to eliminate the brittle phase of CuTeX, so that the possibility of forging cracks is reduced. The method of increasing the heat preservation temperature of the billet and returning to the furnace for heat preservation minimizes the precipitation of the CuTeX brittle phase caused by the reduction of the billet temperature during this process. After the completion, heat preservation control is carried out at 450-200°C during the heat treatment and cooling process, so that the CuTe phase is uniformly and effectively precipitated, so as to ensure that the final material has lower tensile strength and better welding resistance.

Description

technical field [0001] The invention belongs to the technical field of forging technology, and in particular relates to a forging deformation and heat treatment method of a CuCrTe metal profile. Background technique [0002] CuCr alloy material has excellent breaking, withstand voltage, and arc ablation resistance, so it is widely used as a contact material in medium and high voltage vacuum interrupters. As the core component in the interrupter, the contact plays an important role in it, and is the core material of the medium and high voltage transmission and distribution switch vacuum circuit breaker and vacuum interrupter. However, sticking and welding often occur during service, especially in the process of breaking high voltage and high current. The requirements for the contacts are extremely strict. Once welding occurs, the mechanism cannot provide greater force to separate the contacts. If it is light, it will make the electrical appliances not work normally, and if i...

AI Technical Summary

Problems solved by technology

However, sticking and welding often occur during service, especially in the process of breaking high voltage and high current. The requirements for the contacts are extremely strict. Once welding occurs, the mechanism cannot provide greater force to separate the contacts. If it is light, it will make the electrical appliances not work normally, and if it is serious, it will cause a fire, which seriously affects the reliable and safe operation of the electrical system, causing great accidents and economic losses.

[0003] Studies have shown that by adding metal Te elements to the contact material to form a brittle phase CuTeX between Cu and Cr phases, the tensile strength of the contact can be effectively reduced, which is conducive to the contact being pulled apart after welding. Therefore, the properties of the CuCrTe contact material not only have Conventional CuCr contacts have excellent performance, and have lower tensile strength and lower interception level. At present, this kind of material has been recognized by the market, but due to the existence of brittle phase CuTeX at the grain boundary, the CuCrTe contact material is in The forging deformation process is very easy to crack, which makes the pass rate of this material and the utilization rate of raw materials extremely low, resulting in a great waste of materials, and because the CuCrTe material cannot be applied with a large deformation ratio during the forging process, the final use size of the CuCrTe material is limited. The limitation of the size of the original ingot greatly restricts the diameter specifications and occasions of the application of this material. At the same time, the low deformation ratio also makes it impossible to eliminate the defects such as loose casting of the metal during the smelting process by forging, making the material Density cannot be further improved

[0004] When the existing process performs forging deformation and heat treatment on the CuTeX contact material, the billet is not pre-forged. There is a CuTeX brittle phase at the grain boundary and a cold shut area on the outer diameter of the billet, which is easy to cause forging cracks. Because the material is brittle , it is easy to crack during the forging process, so the forging deformation ratio is small, and sufficient forging allowance must be left, which cannot completely eliminate defects such as as-cast looseness during the smelting process, and the material density cannot be further improved; the forging process adopts free forging. , the amount of deformation is not easy to control, and it is easy to cause forging cracks; the heat treatment process cannot completely precipitate the Te dissolved in the Cu phase, thereby forming a brittle phase at the grain boundary, which does not fully reduce the mechanical properties of the material and affects the welding resistance of the contacts performance

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