Preparation method based on sub-rapid solidification and used for Cu-Ni-Si alloy strip

Abstract

The invention discloses a preparation method based on sub-rapid solidification and used for a Cu-Ni-Si alloy strip. The preparation method based on the sub-rapid solidification and used for the Cu-Ni-Si alloy strip comprises the following steps: smelting a Cu-Ni-Si alloy melt according to design components, and then pouring the Cu-Ni-Si alloy melt into a tundish; controlling a superheating degree;pouring the Cu-Ni-Si alloy melt into a twin-roll strip casting-rolling machine through the tundish and carrying out continuous casting; discharging a cast strip from rolls and then cooling the cast strip into a thick cast strip with a thickness of 0.5-5.0mm; carrying out short-time solid solution and then carrying out multi-pass cold-rolling to obtain a cold-rolled strip; and carrying out aging treatment to obtain the alloy strip. A near-net-shape strip can be directly formed from molten metal, so that in the method, the processes of homogenizing annealing, hot-rolling and the like in a traditional process can be omitted, the flow is shortened, and the initial solidification structure of the cast strip is refined through the sub-rapid solidification, so that a grain boundary tends to be developed to a special Sigma3 large-angle grain boundary; meanwhile, the supersaturated solid solubility of Si in a Cu matrix is increased, and the segregation of Ni and Si is effectively suppressed; and meanwhile, the tensile strength after the aging is not less than 700MPa, the electric conductivity is not less than 25%IACS, and the strip with excellent comprehensive performance is finally obtained on the basis of saving energy and reducing emission, simplifying the process, and reducing the production cost.

Description

Technical field: [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for preparing Cu-Ni-Si alloy strips based on subrapid solidification. Background technique: [0002] With the development of communications, electronics, and electric power industries, not only the demand for copper alloy strips has increased sharply, but also a series of new requirements have been put forward in terms of product quality, such as high precision, high surface, and high performance. However, from the domestic production situation of strips From the point of view, a considerable number of copper strip products are medium and low-grade products. Most of the lead frame copper strips, transformer strips, and white copper strips in high-precision strips rely on imports. Develop the production of high-precision strips in my country and improve product quality. , has become an important task for us at present. [0003] Cu-Ni-Si alloys are typical a...

AI Technical Summary

Problems solved by technology

However, there are still many problems in the preparation process: the main reason is that in the traditional hot rolling process, the cooling rate of the alloy solidification structure is slow, resulting in coarse grains and serious microsegregation of the initial solidification structure, which requires long-term homogenization treatment. The metallographic picture of the solidification structure of the process ingot is as follows figure 1 As shown in (a), the metallographic picture of the cast strip solidification structure is as follows figure 1 As shown in (b), the distribution of ingot structure segregation is as follows figure 2 shown

[0006] In the prior art, the preparation of Cu-Ni copper alloys needs to go through tedious processes such as homogenization and hot rolling, and problems such as segregation are prone to occur

Images