Additive manufacturing method for functional material part based on TiNi memory alloy wire

Abstract

The invention belongs to the technical field of forming and manufacturing of metal materials, and particularly relates to an additive manufacturing method for a functional material part based on a TiNi memory alloy wire. The additive manufacturing method comprises the following steps: smelting a titanium-nickel based memory alloy; preparing a titanium-nickel based memory alloy wire; taking the titanium-nickel based memory alloy wire as a raw material; carrying out a laser-cladding additive manufacturing process; and carrying out tissue control and deformation amount control on manufactured parts. A welding pool of a vacuum self-consumption skull furnace is great, and is beneficial for sufficiently homogenizing alloy elements and preventing alloy segregation; and smelting of the vacuum self-consumption skull furnace refers to controlling a cast titanium tissue of a cast ingot, thereby facilitating follow-up cold-hot processing.

Description

technical field [0001] The invention belongs to the technical field of metal material forming and manufacturing, and in particular relates to a method for additive manufacturing of functional material parts based on TiNi memory alloy wire. Background technique [0002] Titanium-nickel-based shape memory alloy has always been a key researched functional alloy material at home and abroad. In recent years, international academic conferences have been held every year to discuss and exchange its research theoretical and principle results, organizational properties, processing methods and production technologies. China's Northwest Institute of Nonferrous Metals, Shenyang Institute of Metal Research, Chinese Academy of Sciences, Tianjin University and other institutions of higher learning and scientific research institutes have also conducted a large number of theoretical research and production process research, and have achieved many scientific research results and patented techno...

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Problems solved by technology

[0002] Titanium-nickel-based shape memory alloy has always been a key researched functional alloy material at home and abroad. In recent years, international academic conferences have been held every year to discuss and exchange its research theoretical and principle results, organizational properties, processing methods and production technologies. China's Northwest Institute of Nonferrous Metals, Shenyang Institute of Metal Research, Chinese Academy of Sciences, Tianjin University and other institutions of higher learning and scientific research institutes have also conducted a large number of theoretical research and production process research, and have achieved many scientific research results and patented technologies. Titanium-nickel-based memory In the application of alloys, it is widely used in aerospace parts; vascular stents and orthopedic implants in the medical field; industrial springs and pipeline connectors; thermostatic valves and spectacle frames in daily necessities. The application mainly uses its two functions: shape memory function and superelasticity, but its other function, high damping characteristics, is rarely studied and used at home and abroad, because the shape memory performance and superelasticity of titanium-nickel-based alloys are determined by the composition In addition to the martensitic transformation point, it also depends on the heat treatment and cold deformation of the material. Conventional manufacturing can only mainly produce titanium-nickel-based alloy wires, tubes, plates and other simple geometric shape processing materials and products produced with them. Products and small parts such as nets, springs, sheets, etc., for parts with complex shapes that use the alloy's damping properties, the inconsistency in the cooling rate of each part during heat treatment will cause uneven structure and performance, which will affect its application field; titanium-nickel-based shape memory alloy The reason why it has the ability to recover from deformation is because of the thermoelastic martensitic phase transformation that occurs inside the material during the deformation process. There are two phases in the shape memory alloy: the high-temperature phase austenite phase, the low-temperature phase martensite phase, and the martensite phase. Phase transformation is not only caused by temperature, but also by stress. This stress-induced martensitic transformation is called stress-induced martensitic transformation, and the phase transformation temperature has a linear relationship with stress. Elasticity (pseudo-elasticity) mean

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