Selective laser melting processing method and application of high nickel-rich niti alloy

Abstract

The invention provides a selective laser melting processing method and application of high nickel-rich NiTi alloy. The processing method includes: 1) presetting NiTi alloy powder to form a layer to be treated, in which the atomic percentage of Ni element is 53-57%, and the balance is Ti atoms; 2) according to the printing process parameters, the The layer to be treated is subjected to laser melting treatment to form the target layer; 3) Step 1)-step 2) is repeated to form a NiTi alloy piece; in the laser melting treatment, the laser power is 80-150W, and the laser scanning speed is 150-450mm / s, the laser scanning distance is 30‑120 μm. The processing method can perform selective laser melting processing on the NiTi alloy powder with high nickel content, which not only can ensure the precision of the processed part, but also can make the processed part have excellent performance in terms of mechanical properties.

Description

Selective laser melting processing method and application of high nickel-rich NiTi alloy technical field The present invention relates to a kind of processing method of high nickel-rich NiTi alloy, relate in particular to a kind of selection of high nickel-rich NiTi alloy A selective laser melting processing method and application belong to the technical field of shape memory alloys. Background technique [0002] Nickel-titanium binary alloys with high nickel content (such as 53–57 at.% Ni) have high hardness, low density, and excellent corrosion resistance It has the advantages of corrosion resistance and superelasticity, which is very beneficial for structural applications, and has potential applications in aerospace, deep-sea exploration and other fields. force. However, the machinability of NiTi alloys with high nickel content is extremely poor, there are difficulties in chip removal, poor weldability and superelasticity inducers. Problems such as poor machining a...

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Problems solved by technology

[0004] At present, there have been many reports on the research results of near-equal atomic ratio NiTi alloys prepared by SLM, but the method of preparing near-equal atomic ratio NiTi alloys by SLM cannot be applied to NiTi alloys with high nickel content.

This is because, unlike NiTi alloys with near equiatomic ratio, NiTi alloys with high nickel content are essentially a kind of Ni 4 Ti 3 NiTi-Ni with a ceramic phase ratio of more than 40% 4 Ti 3 Composite materials, whose microstructure, mechanical properties and phase transition behavior are significantly different from those of near equiatomic ratio NiTi alloys, are extremely difficult to form, and it is even more difficult to prepare structural parts with complex shapes

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