Shape memory wide-width nickel-titanium alloy sheet and method of making

Through multiple VAR melting, composite forging and multi-pass cold rolling processes, high-quality nickel-titanium alloy plates with a width of over 600mm were produced, solving the defect problem in the processing and achieving a balance between high performance and high yield.

CN121183262BActive Publication Date: 2026-05-01ZHEJIANG SHENJI TITANIUM IND
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Patent Information

Application Number
CN202511444583.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-10-10
Publication Date
2026-05-01
Estimated Expiration
2045-10-10

AI Technical Summary

Technical Problem

Existing technologies make it difficult to mass-produce high-quality nickel-titanium alloy plates with a width of 600mm or more. During processing, defects such as cracks, peeling, folding, oxidation, and impurity indentation are prone to occur, resulting in a low yield.

Method used

By coordinating multiple VAR melting, composite forging, two-stage hot rolling, multi-pass cold rolling, intermediate annealing, and graded aging processes, alloy composition and process parameters are controlled to produce shape memory wide nickel-titanium alloy plates with a width of over 600 mm, eliminating internal defects and optimizing the microstructure.

Benefits of technology

It achieves a balance between high yield strength, tensile strength and shape recovery rate, ensuring high quality and mass production capacity of the sheet material, solving the processing problem of wide sheet material, and improving yield and performance stability.

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Abstract

The application discloses a shape memory wide-width nickel-titanium alloy plate and a preparation method thereof, and the preparation method comprises the following steps: mixing and smelting alloy raw materials to prepare a nickel-titanium ingot, and homogenizing the nickel-titanium ingot; cutting off the nickel-titanium ingot after the riser and then cutting the ingot into a to-be-forged ingot blank; adopting a combined forging process of high-frequency forging and low-frequency forging on the ingot blank, and the cumulative deformation is more than 90%; obtaining a hot-rolled plate blank through two-stage hot rolling, including one-stage initial rolling at a temperature of 750-900 DEG C and two-stage finish rolling at a temperature of 700-850 DEG C; cold rolling the hot-rolled plate blank to obtain a cold-rolled plate blank; and performing heat treatment strengthening on the cold-rolled plate blank to obtain a shape memory wide-width nickel-titanium alloy plate with a width of more than 600 mm. The wide-width nickel-titanium alloy plate prepared by the application has a thickness of 0.3-3.0 mm, a yield strength of more than 450 Mpa, a tensile strength of more than 850 Mpa, an elongation of more than 20%, and a shape recovery rate of more than 90%.
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