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Quasi-in-situ test method for crystal structure evolution in pulse current synchronous loading stretching

A technology of crystal structure and pulse current, applied in the direction of applying stable tension/pressure to test the strength of materials, measuring devices, instruments, etc., can solve problems such as inability to perform in-situ testing, and achieve the effect of acquisition

Pending Publication Date: 2021-09-21
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to overcome the deficiency that in-situ testing cannot be carried out under the condition of electrification in the prior art, the present invention proposes a quasi-in-situ testing method for crystal structure evolution in pulse current synchronous loading and stretching

Method used

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  • Quasi-in-situ test method for crystal structure evolution in pulse current synchronous loading stretching
  • Quasi-in-situ test method for crystal structure evolution in pulse current synchronous loading stretching
  • Quasi-in-situ test method for crystal structure evolution in pulse current synchronous loading stretching

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Embodiment 1

[0062] as attached figure 1 As shown, a quasi-in-situ test method for crystal structure evolution in pulse current synchronous loading and stretching of nickel-based superalloy, the method includes the following steps:

[0063] Step 1, prepare a tensile sample:

[0064] A tensile sample is cut from a nickel-based superalloy rolled plate, and the shape of the tensile sample is an inverted "U" shape. The length L of the tensile sample is 16.8 mm, the width H is 12.3 mm, and the thickness D is 1 mm. The bottom of the "U" shape of the tensile sample is the main deformation area of ​​the sample, and this deformation area is defined as gauge length section 1 of the tensile sample. as attached image 3 As shown, the length l of the gauge section of the tensile sample is 5 mm, the width h is 2 mm, and the thickness d is 1 mm.

[0065] The two ends of the bottom of the "U" shape of the tensile sample are the clamping ends 2 of the tensile sample, and the open ends of the "U" shape...

Embodiment 2

[0099] as attached figure 1 As shown, a quasi-in-situ testing method for crystal structure characteristics in a nickel-based superalloy pulse current synchronous loading and stretching process, the method includes the following steps:

[0100] Step 1, prepare a tensile sample:

[0101]Cut a tensile sample from a nickel-based superalloy rolled plate, the shape of the tensile sample is an inverted "U" shape; the length L of the tensile sample is 16.8mm, the width H is 12.3mm, and the thickness is D 1mm. The bottom of the "U" shape of the tensile sample is the main deformation area of ​​the sample, and this deformation area is defined as gauge length section 1 of the tensile sample. as attached image 3 As shown, the length l of the gauge section of the tensile sample is 5 mm, the width h is 1 mm, and the thickness d is 1 mm.

[0102] The two ends of the bottom of the "U" shape of the tensile sample are the clamping ends 2 of the tensile sample, and the open ends of the "U" ...

Embodiment 3

[0136] as attached figure 1 As shown, a quasi-in-situ testing method for crystal structure characteristics in a nickel-based superalloy pulse current synchronous loading and stretching process, the method includes the following steps:

[0137] Step 1, prepare a tensile sample:

[0138] Cut a tensile sample from a nickel-based superalloy rolled plate, the shape of the tensile sample is an inverted "U" shape; the length L of the tensile sample is 16.8mm, the width H is 12.3mm, and the thickness is D 1mm. The bottom of the "U" shape of the tensile sample is the main deformation area of ​​the sample, and this deformation area is defined as gauge length section 1 of the tensile sample. as attached image 3 As shown, the length l of the gauge section of the tensile sample is 5 mm, the width h is 1 mm, and the thickness d is 1 mm.

[0139] The two ends of the bottom of the "U" shape of the tensile sample are the clamping ends 2 of the tensile sample, and the open ends of the "U"...

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Abstract

The invention relates to a quasi-in-situ test method for crystal structure evolution in pulse current synchronous loading stretching, which comprises the steps of performing microhardness dotting positioning on the surface of a tensile sample without a stress layer, and performing electron microscope scanning on the same area of the tensile sample before and after electric auxiliary stretching, thereby realizing quasi-in-situ observation in the pulse current synchronous loading stretching process, crystal structure information of the same area before and after deformation of the tensile sample under the action of the pulse current is acquired, crystal structure information of the same area before and after synchronous loading and stretching of the pulse current is obtained, a microstructure evolution rule of the same area of the sample before and after stretching under the action of the pulse current is researched, and then the accuracy of pulse current action mechanism research is improved. According to the invention, through the electrically-assisted tensile sample connected with an electrode chuck, pulse current synchronous loading tensile is realized, and the evolution rule of the crystal structure of the same area of the material before and after electrically-assisted tensile is obtained.

Description

Background technique [0001] Electric assisted forming is a new multi-energy field composite forming process developed in recent years. By applying pulse current with adjustable current density, frequency and pulse width to the plastically deformed workpiece during the plastic forming process, it can significantly improve The macro, micro and micro formability of materials can achieve the purpose of labor saving, high efficiency and precise forming. However, there are still the following problems in the research on the microstructure evolution law and mechanism of material deformation under the action of pulse current: [0002] 1. In terms of the existing microscopic experimental characterization of pulse current assisted forming, the experiment is to study the microstructure evolution law of the material before and after the pulse current, which mainly includes the changes of texture, grain size and microstructure. However, since the selected areas in the experiment are all t...

Claims

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Application Information

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IPC IPC(8): G01N3/08G01N3/06
CPCG01N3/08G01N3/06G01N2203/0003G01N2203/0017G01N2203/005G01N2203/0075G01N2203/0252G01N2203/0641
Inventor 李宏伟张昕邵光大詹梅马丹阳
Owner NORTHWESTERN POLYTECHNICAL UNIV
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