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A method and application of salt film method to improve the surface quality of alloy micro-area

A surface quality and alloy technology, which is applied in the field of electrolytic processing of laser additive manufacturing, can solve problems such as cracks, affecting the service life of alloy devices, and poor micro-area quality, so as to improve the quality of micro-areas, improve quality, and solve micro-area quality. poor effect

Active Publication Date: 2022-06-28
QINGDAO TECHNOLOGICAL UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the surface of the workpiece alloy still has the problem of poor micro-area quality. The micro-area defects seriously affect the service life of the alloy device, especially in the place under dynamic load. These micro-area defects can easily induce crack initiation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A method for improving the surface quality of alloy micro-regions by a salt film method adopts direct current electrolytic machining on the surface of alloy components, specifically:

[0039] After the laser three-dimensional forming of Inconel 718 alloy components is completed, they are directly subjected to DC electrolytic machining. The DC electrolytic machining process parameters are: the tool electrode is a stainless steel tube electrode (outer diameter is 1.2mm, inner diameter is 0.8mm), the applied voltage is 24V, the machining gap is 0.5mm, the feed rate is 2mm / s, and the electrolyte flow rate is 5ml / s, the electrolyte is selected from sodium chloride ethylene glycol electrolyte with saturated nickel chloride added. After one layer is processed, the height of the tube electrode is adjusted so that the processing gap is 0.5mm, and the processing of a new layer is started until the remaining allowance is processed.

[0040] Test results: The surface morphology o...

Embodiment 2

[0042] A method for improving the surface quality of alloy micro-regions by a salt film method adopts nanosecond pulse electrolytic machining directly on the surface of alloy components, specifically:

[0043] After the laser three-dimensional forming of Inconel 718 alloy components is completed, nanosecond pulse electrolytic machining is directly performed on them. Due to the uneven surface of the component, when using a stainless steel tube electrode (outer diameter is 1.2mm, inner diameter is 0.8mm) for processing, the highest point of the sample should be used as the benchmark for processing. The distance between the end face of the tube electrode and the highest point of the sample is 2 μm, the feed rate in the horizontal plane is 2 mm / s, the flow rate of the electrolyte is 5 ml / s, and the electrolyte is sodium chloride ethylene glycol electrolyte with saturated nickel chloride added. The applied potential is 10V, the pulse frequency is 10ns, and the duty cycle is 50%. A...

Embodiment 3

[0048] A method for improving the surface quality of alloy micro-regions by a salt film method adopts direct current electrolytic machining on the surface of alloy components, specifically:

[0049] After the laser three-dimensional forming of Inconel 718 alloy components is completed, they are directly subjected to DC electrolytic machining. The DC electrolytic machining process parameters are: the tool electrode is a stainless steel tube electrode (outer diameter is 1.2mm, inner diameter is 0.8mm), the applied voltage is 24V, the machining gap is 0.5mm, the feed rate is 2mm / s, and the electrolyte flow rate is 5ml / s, the electrolyte is selected from sodium chloride ethylene glycol electrolyte with saturated nickel chloride and chromium trichloride added. After one layer is processed, the height of the tube electrode is adjusted so that the processing gap is 0.5mm, and the processing of a new layer is started until the remaining allowance is processed.

[0050] Test results:...

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Abstract

The invention relates to the technical field of electrolytic processing for laser additive manufacturing, and specifically relates to a method and application of a salt film method for improving the surface quality of alloy micro-regions. The method includes: using saturated nickel chloride, sodium chloride and ethylene glycol mixed electrolysis liquid for electrolytic machining. By forming a supersaturated salt film on the surface of the workpiece, the quality of the micro-area on the surface of the workpiece is further improved, and the service life of the alloy device is improved.

Description

technical field [0001] The invention relates to the technical field of electrolytic machining of laser additive manufacturing, in particular to a method and application for improving the surface quality of an alloy micro-region by a salt film method. Background technique [0002] The disclosure of information in this Background section is only for enhancement of understanding of the general background of the invention and should not necessarily be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art. [0003] As an advanced additive manufacturing technology, laser three-dimensional forming technology can realize high-performance, full-dense, near-net shape of large, complex and difficult-to-machine metal components, so it is widely used in aviation, aerospace, navigation and nuclear power and other fields. Nickel-based superalloys have attracted much attention due to their excel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23H3/10B23H11/00
CPCB23H3/10B23H11/00Y02P10/25
Inventor 郭鹏飞吴琳王家昌刘岩松林鑫兰红波
Owner QINGDAO TECHNOLOGICAL UNIVERSITY