Carbide-enhanced type invar alloy wire and preparing method thereof

Abstract

The invention relates to a carbide-enhanced type invar alloy wire and a preparing method thereof. The wire is mainly prepared from, by mass, 0.05-0.2% of C, 34-38% of Ni, smaller than or equal to 0.005% of S, smaller than or equal to 0.005% of P, 0.015-0.04% of Al, 0.1-3.5% of carbide forming elements and the balance Fe and inevitable impurities. The preparing method comprises the steps that the alloy components are prepared into a cast ingot through smelting and casting of a vacuum melting furnace, the cast ingot is forged into a round stick, the round stick is subjected to hot rolling to form a wire rod, the wire rod is subjected to cold drawing to form a wire body, and the wire body is subjected to aging heat treatment, surface acid pickling, surface finishing and other procedures. The carbide-enhanced type invar alloy wire and the preparing method thereof have the advantages that alloy raw materials are saved, the technological process is simplified, and production cost is reduced. The tensile strength of the produced alloy wire is higher than or equal to 1000 MPa, the coefficient of thermal expansion within the range of minus 100-200 DEG C is smaller than or equal to 2.6*10<-6> / DEG C, and the performance requirement of up-rating wire core products is met.

Description

technical field [0001] The invention belongs to the technical field of metal functional materials, and in particular relates to a carbide-reinforced Invar alloy wire and a preparation method thereof. Background technique [0002] The iron-nickel alloy (also known as Invar alloy) with a nickel mass fraction of 36% 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. It is a key material for making display shadow masks, thermal bimetallic strips, glass sealing wires, microwave resonators, precision laser components, liquid natural gas and liquid oxygen storage tanks, etc. [0003] It should be pointed out that the "YB / T5241-2005 low-expansion iron-nickel, iron-nickel-cobalt alloy" standard stipulates that the alloy composition (weight %) within the scope of 4J36 is: C≤0.05%, Ni: 35-37%, Mn: 0.2~0.6%, Si≤0.3%, S≤0.02%, P≤0.02%, the rest...

AI Technical Summary

Problems solved by technology

The 4J36 alloy produced by relying on this chemical composition has a tensile strength of less than 500 MPa at room temperature and can only be used as a functional material for a long time, which is difficult to meet the performance requirements of structural materials in the new situation

For some products that do not require particularly high strength indicators, how to control the tensile strength of Invar alloy wires above 1000MPa has received less attention in the research literature.