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Preparation method of crack-free nickel-titanium-copper alloy for additive manufacturing

A technology of additive manufacturing and copper alloy, which is applied in the direction of additive manufacturing and additive processing, can solve the problems of high reflectivity of Cu element, high residual stress of alloy, intensified non-equilibrium solidification, etc., and achieve excellent comprehensive performance and reduce internal stress , the effect of eliminating cracks

Active Publication Date: 2022-06-28
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003]However, as a rapid solidification process, the complex thermal history (high temperature inside the molten pool, Fast cooling on the boundary) will lead to non-equilibrium solidification and repeated remelting of the alloy, resulting in high residual stress in the printed alloy, which is prone to deformation and cracking, affecting its overall performance
Especially for NiTiCu alloy prepared by SLM process, due to the high reflectivity of Cu element, the precipitated phase generated during solidification will lead to alloy embrittlement, and the problem of cracking has become the biggest obstacle to its application.

Method used

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  • Preparation method of crack-free nickel-titanium-copper alloy for additive manufacturing
  • Preparation method of crack-free nickel-titanium-copper alloy for additive manufacturing
  • Preparation method of crack-free nickel-titanium-copper alloy for additive manufacturing

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Effect test

Embodiment 1

[0035] A method for preparing a crack-free nickel-titanium-copper alloy for additive manufacturing, such as figure 1 shown, including the following steps:

[0036] Step S1, composition design: Based on the Hill solidification model and the crack sensitivity factor calculation method proposed by Kou et al. [S.Kou Acta Materialia 88(2015) 366–374], the thermodynamic calculation software Pandat [https: / / computherm.com / ] to calculate the hot cracking tendency within the target alloy composition range, such as figure 2 As shown, it is the calculation result of the crack susceptibility factor of nickel-titanium-copper alloys with different compositions, and selects the alloy composition with the lowest hot cracking tendency to carry out batching. Specifically, in the present embodiment 1, the selected alloy composition is calculated by mass percentage as: Nickel-45.04wt.%, Copper-10.01wt.%, Silicon-0.10wt.%, Oxygen-0.054wt.%, Aluminum-0.10wt.%, Iron-0.04wt.%, Chromium-0.05wt.%, C...

Embodiment 2

[0061] A preparation method of a crack-free nickel-titanium-copper alloy for additive manufacturing, referring to Example 1, the difference from Example 1 is only:

[0062] 1) The structure designed in step S32 is as follows: a combination of "outside rounded corners" and "internal rounded corners" is adopted. Specifically, in step S33, when using NX-10 and Materialise-Magics3 software to model the part structure in 3D, four parts are constructed on the substrate, three of which are 25mm×25mm on the upper surface and 30mm×30mm on the lower surface. , a prism with a height of 8mm, and a rounded corner with a radius of 3mm is constructed on the edges of these three parts. The other part is an ordinary round table with a radius of 12mm on the upper surface and a radius of 15mm on the lower surface. Fillet with radius 3mm. On the substrate, rotate these four parts clockwise by 15° to form an inclination with the direction of travel of the squeegee.

[0063] 2) When setting the p...

Embodiment 3

[0072] A preparation method of a crack-free nickel-titanium-copper alloy for additive manufacturing, referring to Example 1, the difference from Example 1 is only:

[0073] 1) The structure designed in step S32 is as follows: a combination of "printing substrate", "outside fillet" and "inner fillet" is used, a nickel-titanium alloy substrate is selected as the printing substrate, and the SLM equipment first prints a thick layer on the substrate. It is a 1mm long and wide 80mm×80mm sheet with rounded corners and the same composition as the part, and is remelted twice on the upper layer, cooled to the substrate temperature, and used as a new substrate. This new substrate can reduce substrate and printing. Internal stress between parts to prevent warping; construct a part on a new substrate, the part is a prism with an upper surface of 50mm × 50mm, a lower surface of 60mm × 60mm, and a height of 8mm, and a 4mm outer circle is set on the edge of the part. corner, and the contact p...

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Abstract

A preparation method of a crack-free nickel-titanium-copper alloy for additive manufacturing comprises the steps that firstly, the hot crack trend in a target alloy component range is calculated, the alloy component with the lowest hot crack trend is selected for burdening and smelting, and nickel-titanium-copper alloy powder is prepared through a gas atomization method; designing a'grid lap joint 'parameter optimization structure, modeling the'grid lap joint' parameter optimization structure and a part structure, designing a position and a support, and slicing; keeping the original coordinates of the model unchanged, setting a printing path and a scanning strategy, inputting process parameters, and copying a set project file into SLM equipment; debugging equipment, firstly printing a sheet layer to form a new substrate, and then printing a part; when the temperature of the substrate is reduced to 70 DEG C or below, the substrate with the printing piece is taken down and placed in a furnace for heat preservation; and finally, the printed piece is cut off from the base plate and ground, and the nickel-titanium-copper alloy is obtained. According to the nickel-titanium-copper alloy and the preparation method thereof, printing cracks are eliminated through component design, process parameter optimization and structural design, and the nickel-titanium-copper alloy high in density, good in formability and excellent in comprehensive performance is prepared.

Description

technical field [0001] The invention relates to the technical field of metal additive manufacturing, in particular to a method for preparing a crack-free nickel-titanium-copper alloy for additive manufacturing. Background technique [0002] Nitinol-based alloys are the most widely used shape memory alloys. Among them, nickel-titanium-copper alloy films and springs exhibit high power ratio, high recoverable stress, and excellent fatigue performance, and are widely used in micro-actuator devices and spring brakes. However, using the traditional processing technology to prepare the nickel-titanium-copper shape memory alloy has high cost and complicated process, and it is difficult to realize the manufacture of complex structure. Selective Laser Melting (SLM), as a 3D printing method with precise control of forming, can ensure the smoothness and geometric accuracy of parts, and can realize the manufacture of structure-function integrated shape memory alloys. Therefore, SLM tec...

Claims

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Application Information

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IPC IPC(8): B22F9/08B22F10/28B22F10/30B22F10/40B22F10/85B33Y10/00B33Y50/00
CPCB22F9/082B22F10/28B22F10/85B22F10/40B22F10/30B33Y10/00B33Y50/00Y02P10/25
Inventor 张利军李志诚钟静易旺
Owner CENT SOUTH UNIV
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