High-strength and low-expansion coefficient alloy wire and manufacturing method thereof

Abstract

The invention discloses a high-strength and low-expansion coefficient alloy wire. The matrix is of austenite. The austenitic matrix is dispersedly distributed with Ni3(Ti, Al). The chemical elements of the high-strength low-expansion coefficient alloy wire includes by mass percent: no more than 0.05% of C; no more than 0.50% of Si; no more than 0.60% of Mn; 36.0-42.0% of Ni; 1.5-3.0% of Ti; 0.3-1.0% of Al; the balance being Fe and other unavoidable impurities. Accordingly, the present invention also discloses a manufacturing method of the high-strength and low-expansion coefficient alloy wire. The tensile strength of the high-strength and low-expansion coefficient alloy wire described by the invention is greater than or equal to 1500 Mpa, and the average linear expansion coefficient is less than or equal to 3.5*10-6 / DEG C in the range of 20-100 DEG C temperature.

Description

technical field [0001] The invention relates to an alloy and a manufacturing method thereof, in particular to an alloy wire rod and a manufacturing method thereof. Background technique [0002] Invar alloy Fe-36Ni, the chemical composition is: C≤0.05%, Si≤0.20%, P≤0.020%, S≤0.020%, Ni: 35.7~37.0%, Mn: 0.20~0.60%, the rest is Fe and not The impurity to be avoided is a low expansion coefficient alloy whose expansion coefficients are ≤1.5×10 in the temperature ranges of 20-100°C and 20-300°C respectively -6 / °C and ≤5.1×10 -6 / °C. Invar alloys are widely used due to their very low coefficient of expansion. For example, it can be used to manufacture standard rulers, inner walls of liquefied natural gas ship cabins, carbon fiber composite molds, etc. However, the strength of ordinary Invar alloy is very low, about 400-500MPa, which limits its use in low-expansion structural parts. [0003] At present, the main method to improve the strength of Invar alloy is to use Fe-36Ni a...

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Problems solved by technology

[0009] The alloy wire rod of the present invention adopts the strengthening method of intermetallic compound strengthening and cold deformation strengthening, on the basis of the chemical composition of Fe-36Ni Invar alloy, by effectively utilizing Ti and Al, and limiting them within an appropriate composition range , using a reasonable processing technology to form a dispersed distribution of Ni 3 (Ti, Al) strengthening phase, under the premise of ensuring the low thermal expansion coefficient of the alloy wire, makes the tensile strength of the alloy wire reach more than 1500MPa, effectively solving the problem of low strength of the Invar alloy wire

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