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Laser additive manufacturing method of NiTi alloy with large recoverable strain

A laser additive and manufacturing method technology, applied in additive manufacturing, additive processing, metal processing equipment, etc., can solve the problems of low strain recovery rate of products or components, failure to meet the requirements of use, etc., and achieve excellent superelastic recovery performance and shape memory effect, no macroscopic cracks, large forming process window

Pending Publication Date: 2021-02-26
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The laser near net shape (LENS) additive manufacturing process based on laser synchronous powder feeding has the above advantages, but compared with the NiTi alloy prepared by the traditional method, the strain recovery rate of the obtained product or component is low, which cannot meet the requirements for use

Method used

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  • Laser additive manufacturing method of NiTi alloy with large recoverable strain
  • Laser additive manufacturing method of NiTi alloy with large recoverable strain
  • Laser additive manufacturing method of NiTi alloy with large recoverable strain

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The first step: NiTi alloy powder particle size ranges from 50 μm to 150 μm, and is prepared by electrode induction gas atomization technology. The NiTi alloy powder is dried in a vacuum (≤0.1Pa) environment at 120°C for 2 hours, cooled to room temperature, taken out and put into a powder feeder.

[0034] Step 2: Place and fix a NiTi alloy substrate with a size of 120mm×120mm×10mm in the forming chamber. Under the circulation of high-purity argon, the oxygen content of the atmosphere in the forming chamber is within 100ppm, and the forming starts.

[0035] Step 3: Turn on the laserline LDF6000 semiconductor laser, select a spot diameter of 3mm, and start to operate with a laser power of 1200W and a scanning rate of 800mm / min under the control of the CNC workbench, using high-purity argon as the powder delivery of the powder-carrying airflow The device sends the NiTi alloy powder to the NiTi alloy substrate for deposition at a powder feeding rate of 11.5g / min. The overla...

Embodiment 2

[0039] The first step: NiTi alloy powder particle size ranges from 50 μm to 150 μm, and is prepared by electrode induction gas atomization technology. The NiTi alloy powder is dried in a vacuum (≤0.1Pa) environment at 110°C for 2 hours, cooled to room temperature, taken out and put into a powder feeder.

[0040] Step 2: Place and fix a NiTi alloy substrate with a size of 120mm×120mm×10mm in the forming chamber. Under the circulation of high-purity argon, the oxygen content of the atmosphere in the forming chamber is within 100ppm, and the forming starts.

[0041] Step 3: Turn on the CP4000 CO 2 The laser, with a spot diameter of 2 mm, starts to operate with a laser power of 1500 W and a scanning rate of 800 mm / min under the control of a numerical control workbench. High-purity argon is used as the powder feeding device for the powder-carrying air flow to feed NiTi at a powder feeding rate of 11 g / min. The alloy powder is sent to the NiTi substrate for deposition, and the over...

Embodiment 3

[0044] The first step: NiTi alloy powder particle size ranges from 50 μm to 150 μm, and is prepared by electrode induction gas atomization technology. The NiTi alloy powder is dried in a vacuum (≤0.1Pa) environment at 120°C for 2 hours, cooled to room temperature, taken out and put into a powder feeder.

[0045] Step 2: Place and fix a NiTi alloy substrate with a size of 120mm×120mm×10mm in the forming chamber. Under the circulation of high-purity argon, the oxygen content of the atmosphere in the forming chamber is within 100ppm, and the forming starts.

[0046] Step 3: Turn on the CP4000 CO 2 The laser, with a spot diameter of 2 mm, starts to operate with a laser power of 1700 W and a scanning rate of 680 mm / min under the control of a numerical control workbench. High-purity argon is used as the powder feeding device for the powder-carrying air flow to feed NiTi at a powder feeding rate of 9 g / min. The alloy powder is sent to the NiTi substrate for deposition, and the overl...

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Abstract

The invention relates to a laser additive manufacturing method of a NiTi alloy with large recoverable strain. The method includes the following steps that a NiTi alloy plate is used as a base material, two different energy sources, namely a CO2 laser and a semiconductor laser are adopted, high-purity argon is introduced to control the oxygen content of the atmosphere in a forming chamber to be within 100 ppm, and NiTi alloy powder with the granularity being 50-150 mu m is continuously fused and deposited on the base material in a coaxial powder feeding mode with a cross scanning strategy; in the deposition process, a relatively-large laser beam spot diameter and high laser power are selected, relatively-high energy input is obtained by controlling the laser power and the scanning rate under a certain powder feeding rate, then a formed compact NiTi alloy block is obtained, and it is guaranteed that the mechanical property of a formed sample is equal to or even superior to that of a homogeneously-cast and forged NiTi alloy sample. The NiTi alloy block prepared with the technology has relatively-strong preferred orientation (<001> / / deposition direction), and the excellent superelasticrecovery performance and shape memory effect of the formed sample are ensured.

Description

technical field [0001] The invention belongs to the field of advanced manufacturing of materials, and relates to a laser additive manufacturing method of large recoverable strain NiTi alloy. In particular, it involves the preferred orientation (<001>∥deposition direction), which makes the sample have excellent superelastic properties and shape memory effect; it has better metallurgical fusion and excellent mechanical properties. Background technique [0002] Near-equal atomic ratio NiTi alloy is a kind of shape memory material, because of its excellent superelasticity, shape memory effect, good mechanical properties and biocompatibility, it has been widely used in aviation, engineering and medical fields. application. The traditional way of preparing and processing NiTi alloy is difficult to directly obtain complex shape components with excellent intelligent properties, which greatly limits the further application of this alloy. [0003] Laser additive manufacturing ...

Claims

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Application Information

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IPC IPC(8): B22F10/28B22F12/41B22F10/32B22F12/50B22F1/00C22C14/00C22C19/03B33Y10/00B33Y30/00
CPCB22F3/003C22C19/03C22C14/00B33Y10/00B33Y30/00B22F1/142
Inventor 丰焱王硕万雪曼
Owner NORTHWESTERN POLYTECHNICAL UNIV
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