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Method for improving surface quality of alloy micro-area through salt film method and application

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

Active Publication Date: 2021-11-09
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 using a salt film method, using direct current electrolytic machining on the surface of alloy components, specifically:

[0039] After the laser three-dimensional forming Inconel 718 alloy component is completed, it is directly subjected to DC electrolytic machining. The parameters of the DC electrolytic machining process are: the tool electrode is a stainless steel tube electrode (outer diameter 1.2mm, inner diameter 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 sodium chloride ethylene glycol electrolyte added with saturated nickel chloride. After processing one layer, adjust the height of the tube electrode so that the processing gap is 0.5mm, and start the processing of a new layer until the remaining margin is processed.

[0040] Test results: The surface morphology of the sample was observed wit...

Embodiment 2

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

[0043] After the laser three-dimensional forming Inconel 718 alloy component is completed, it is directly subjected to nanosecond pulse electrolytic machining. Due to the uneven surface of the component, when using a stainless steel tube electrode (1.2mm in outer diameter and 0.8mm in inner diameter) for processing, the highest point of the sample should be used as the reference 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. The applied potential is 10V, the pulse frequency is 10ns, and the duty cycle is 50%. After processing this ...

Embodiment 3

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

[0049] After the laser three-dimensional forming Inconel 718 alloy component is completed, it is directly subjected to DC electrolytic machining. The parameters of the DC electrolytic machining process are: the tool electrode is a stainless steel tube electrode (outer diameter 1.2mm, inner diameter 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 sodium chloride ethylene glycol electrolyte added with saturated nickel chloride and chromium trichloride. After processing one layer, adjust the height of the tube electrode so that the processing gap is 0.5mm, and start the processing of a new layer until the remaining margin is processed.

[0050] Test results: The surface morphology of th...

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Abstract

The invention relates to the technical field of electrolytic machining of laser additive manufacturing, in particular to a method for improving the surface quality of an alloy micro-area through a salt film method and application. The method comprises the step that electrolytic machining is conducted through saturated nickel chloride, sodium chloride and ethylene glycol mixed electrolyte. A supersaturated salt film is formed on the surface of a workpiece, so that the micro-area quality of the surface of the workpiece is further improved, and the service life of an alloy device is prolonged.

Description

technical field [0001] The invention relates to the technical field of electrolytic processing for laser additive manufacturing, in particular to a method and application of a salt film method for improving the surface quality of alloy micro-regions. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] As an advanced additive manufacturing technology, laser stereoforming technology can realize high-performance, fully dense, and near-net shape of large, complex, and difficult-to-machine metal components. Therefore, it is widely used in aviation, aerospace, navigation, and nuclear power. Nickel-based superalloys have attracted much attention due to their excellent mechanical pro...

Claims

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Application Information

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Patent Type & Authority Applications(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