Ultrafine grained invar alloy ribbon and preparation method thereof

Abstract

The invention discloses an ultrafine grained invar alloy ribbon and a preparation method thereof. The invar alloy is composed of the following components in percentage by weight: 35 to 40% of Ni, 0.2 to 0.4% of C, less than 0.002% of S, less than 0.002% of P, one or two components of the following elements: 0.1 to 1.5% of V, 0.1 to 1.5% of Ti, 0.01 to 1.0% of Nb, 1.0 to 6.0% of Mo, and 1.0 to 8.0% of Cr, and the balance being Fe. The preparation method comprises steps of smelting, casting, solid solution processing, hot rolling and quick quenching. The average particle size of the prepared ultrafine grained invar alloy ribbon is in a range of 3.0 to 5.0 [mu]m. The whole preparation process only comprises steps of ingot smelting, plate rolling, and quick quenching for producing ribbons, no chemical reagent is introduced into the ribbon, so no chemical agent is discharged and the pollution to the environment is avoided. The prepared ultrafine grained invar alloy ribbon has the advantages of low cost, no pollution, and uniform size. The provided method can enhance the ultrafine grains and develop high-strength invar alloy ribbon products.

Description

technical field [0001] The invention relates to an Invar alloy material, in particular to an ultrafine-grained Invar alloy thin strip and a preparation method thereof. Background technique [0002] The iron-nickel alloy with a nickel mass fraction of 36%, also known as Invar alloy, can exhibit an extremely low thermal expansion coefficient below the Curie temperature, and has great application value in precision instruments, electronics industry, aerospace and other fields. Key materials for making display shadow masks, thermal bimetal sheets, glass sealing wires, microwave resonators, precision laser components, storage tanks for liquid natural gas and liquid oxygen, etc. [0003] Thin-gauge Invar alloy materials are a type of product that is used more frequently, and are often used to make equipment components such as display shadow masks and thermal bimetallic sheets. The traditional process for preparing this Invar strip or plate is: melting Invar alloy → casting molten...

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Problems solved by technology

Furthermore, Lu Yanping and others proposed in the Chinese patent "Preparation Method of Invar Alloy Foil" (application number: 200510127808.7) to use electrodeposition to prepare Invar alloy foil, but this method requires the use of boric acid, sodium acetate, sodium phosphate, Sodium dihydrogen phosphate, sodium lauryl sulfate, sodium ethylhexylsulfonate, thiourea and other chemical reagents, the solutions used in the preparation process may pollute the environment during the discharge process

Furthermore, Lian Qifang pointed out in "Fe-Ni Alloy Continuous Casting Thin Strip and Its Manufacturing" ("Metal Functional Materials" 1996, 2, 58-63) that twin-roll continuous casting method can be used to make Invar alloy thin strip; but Due to the excessively large grains in the continuous casting process, the driving force for grain growth is small in the position where the dislocation density is small during cold rolling, so there are small grain areas in the product; in other words, there are large grains in other positions of the product. Grain area, that is, there is a grain structure of non-uniform size throughout the product, which is detrimental to the uniformity of mechanical properties; and the article does not provide specific grain refinement indicators

[0004] So far, in the prior art, whether it is in the industrial field or under laboratory conditions, the preparation method of Invar alloy thin strips with low cost, no pollution, and uniform size cannot be realized at the same time.

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