Neutron diffraction residual stress determination device and method

A technology of residual stress and measurement device, which is applied in the direction of material analysis using radiation diffraction, etc. It can solve the problems of heavy workload for delamination measurement, inability to perform such correction, and poor measurement accuracy.

Active Publication Date: 2012-05-02
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Abstract
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  • Claims
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Problems solved by technology

Delamination will cause the release of residual stress. Samples with simple shapes can be corrected for residual stress delamination according to a certain formula, but workpiece

Method used

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  • Neutron diffraction residual stress determination device and method
  • Neutron diffraction residual stress determination device and method
  • Neutron diffraction residual stress determination device and method

Examples

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Embodiment

[0106] In this embodiment, the material used in the experiment is low carbon steel (WA300 grade) with a length of 200mm, a width of 60mm, and a thickness of 8mm. The schematic diagram is as follows Figure 9 and Figure 10 As shown, the axial-flow 5kW CO2 laser is used to scan the surface three times along the width direction of the sample to achieve a bending angle of 0.9° (high-energy laser metal sheet forming is an emerging plastic processing method, which has high efficiency, flexibility, no mold, no external force And no noise and other advantages. It uses laser scanning metal sheet to produce obvious temperature gradient in the heat action area, resulting in non-uniform distribution of internal stress. When the internal stress exceeds the yield strength of the material, the sheet will be deformed. Therefore, laser forming Often referred to as laser bending forming or laser bending.Laser forming process overcomes the shortcomings of high cost and long production cycle cau...

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Abstract

The invention discloses a neutron diffraction residual stress determination device and a method. The device is characterized by using the reactor neutron source, carrying out monochromatization by a monochromator to obtain a required monochromatic neutron beam at a certain wavelength, and using the neutron beam to detect the residual stress. According to the invention, because the neutrons are uncharged, and when the neutrons interact with substance, the neutrons have no effect with extranuclear electons, charge Coulombian force obstacle has no need to overcome, thus low energy neutrons can enter in atoms; the neutron absorption of great majority of materials is low, thus the penetration depth of incoming neutron beam is deep. Simultaneously by collimator and slit collimation, the limitedneutron beam has high space resolution ratio, a three-dimensional lossless and deep stress test of a test piece is realized by translation of three directions which are vertical to each other and rotation around testing central point, and the defect that an X-ray and a synchrotron radiation residual stress determination device can only losslessly determine the residual stress of the crystal material surface and subsurface is overcome.

Description

technical field [0001] The invention relates to the technical field of residual stress detection, in particular to a neutron diffraction residual stress measurement device and method. Background technique [0002] When mechanical parts or large components are manufactured, various processes often leave residual stress on it (the residual stress inside the material after the external force is removed); other manufacturing processes, such as shot peening and rolling, are designed to Add appropriate residual stress to the workpiece. In the manufacturing process, appropriate and reasonably distributed residual compressive stress may become a factor to improve fatigue strength and stress corrosion resistance, thereby prolonging the service life of parts and components; inappropriate residual stress will reduce fatigue strength and generate stress Corrosion, loss of dimensional accuracy, and even early failure accidents such as deformation and cracking. Therefore, the residual s...

Claims

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Application Information

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IPC IPC(8): G01N23/20
Inventor 陈东风刘蕴韬李峻宏李际周高建波韩松柏李天富焦学胜李眉娟王洪立孙凯肖红文祖勇刘荣灯武梅梅余周香梁峰张莉胡瑞刘晓龙韩文泽吴立齐陈娜孙硕
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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