Method for forming complex NiTi alloy component through additive manufacturing

Abstract

The invention discloses a method for forming a complex NiTi alloy component through additive manufacturing. According to the method, a metal base plate is installed at the bottom of a forming chamber,the forming chamber is filled with high-purity argon beforehand to make the oxygen content in the forming chamber smaller than 60 microliter per liter, a selective laser melting technology is utilized to form the complex NiTi alloy component, layer-by-layer laser cladding is realized through the numerical control program of each layer to finally obtain a three-dimensional metal part, and the problem that the complex NiTi alloy component with good mechanical property cannot be made with a common smelting method or a powder metallurgy method in the prior art is solved. With the method for forming a complex NiTi alloy component through additive manufacturing, the various complex NiTi alloy components with cambered surfaces, complex inner chambers and the like are quickly formed without any special molds or any special tools, and the made components are good in interlayer combination, simple in technology, and short in manufacturing period, and has the characteristics of being high in density, accuracy, metal powder utilization rate and the like.

Description

technical field [0001] The invention belongs to the technical field of laser additive manufacturing, in particular to a method for forming complex NiTi alloy components by additive manufacturing. Background technique [0002] Laser Additive Manufacturing (Laser Additive Manufacturing, LAM) technology, also known as laser 3D printing technology, is an additive manufacturing technology that uses lasers as energy sources. Lasers have the characteristics of high energy density and can realize the manufacture of difficult-to-machine metals, such as Titanium alloys, high-temperature alloys, etc. used in the aerospace field. At the same time, laser additive manufacturing technology can also overcome the large waste of raw materials caused by traditional subtractive manufacturing. It has rapid prototyping, fine grain, uniform and defect-free structure, and high structural strength. With many excellent features, it is not limited by the structure of the part, and can be used for the ...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of traditional methods for preparing complex NiTi alloy components, and provide a method for forming complex NiTi alloy components through selective laser melting technology (SLM), which can form various curved surfaces, complex inner cavities, etc. Using complex NiTi alloy components that are difficult to achieve by traditional processing methods, the prepared components have better interlayer bonding, simple process, short manufacturing cycle, high density, high precision, and high metal powder utilization.

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