Method and device for simultaneously detecting elements, defects and residual stress

A technology of residual stress and elements, which is applied in the field of laser material detection, achieves the effect of wide application prospects and simple sample preparation

Active Publication Date: 2019-07-09
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Aiming at the defects or improvement needs of the prior art, the present invention provides a method for simultaneously detecting the elements, defects and residual stress of materials, which overcomes the inability to measure simultaneously or obtain elements, Defects and Residual Stress Defects

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  • Method and device for simultaneously detecting elements, defects and residual stress
  • Method and device for simultaneously detecting elements, defects and residual stress
  • Method and device for simultaneously detecting elements, defects and residual stress

Examples

Experimental program
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Embodiment 1

[0071] Now take the detection of arc additive manufacturing samples as an example to illustrate the use process of the laser photoacoustic composite detection system of the present invention. The specific operation steps are as follows:

[0072] (1) The pulsed laser 6 is a Nd:YAG Q-switched laser with an emission wavelength of 532 nm, a pulse width of 8 ns, and an adjusted pulse energy of about 50 mJ. The ultrasonic detector 3 uses a water-immersed ultrasonic probe with a center frequency of 20MHz. The digital delay generator 5 model is DG535, and its delay resolution is 5ps.

[0073] (2) The welding sample is placed on the sample holder 15 . The scanning surface faces the laser light outlet, adjust the position of the 3D displacement platform 4 in the Y-axis direction and the position of the focusing objective lens 14, so that the pulsed laser beam is focused on the focus position; adjust the position of the high-precision 3D displacement platform 4 on the X-Z axis to the po...

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Abstract

The invention discloses a multifunctional laser photoacoustic detection method and device for elements, defects and residual stress, and belongs to the field of laser material detection. Pulse laser is incident to the surface of a sample to be detected by utilizing a pulse laser in order to generate plasma and ultrasonic waves, and the elemental composition, the structural defects and the residualstress of the sample can be simultaneously analyzed. The detection system comprises an excitation unit, a spectrum detection unit, an ultrasonic detection unit and an analysis control unit, wherein adigital delayer is connected to a computer; a high-precision 3D displacement platform is electrically connected to the digital delayer; the pulse laser emitted by the pulse laser is modulated, focused and incident to the surface of the sample to be detected through a light path system in order to generate the plasma and ultrasonic waves at the same time; the ultrasonic detection unit is used fordetecting the ultrasonic waves; and the spectrum detection unit is used for detecting a visible light spectrum emitted by plasma flame. According to the method and the device, simultaneous detection and analysis of the elemental composition, the defects and the residual stress of the sample can be realized.

Description

technical field [0001] The invention belongs to the field of laser material detection, and specifically relates to a multifunctional laser photoacoustic detection and signal analysis method and device for elemental composition, defect and residual stress distribution excited by pulsed laser, mainly through the pulsed laser to excite the light generated by the material. , Acoustic signals are detected and analyzed, and the simultaneous detection of elements, defects and residual stress of the target is realized. Background technique [0002] The emergence of new materials is an important driving force to promote the development of the industry, and the quality inspection of components manufactured by materials is an important guarantee to ensure the safety and reliability of components and their promotion and application. Therefore, high-precision and rapid detection of material components is an urgent need in the manufacturing industry. need. At present, in the field of mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D21/02
CPCG01D21/02G01N21/718G01N21/1702G01N2021/1706G01N29/4436G01N2291/0289G01N29/2418G01N29/07G01N29/4472G01N2291/0423
Inventor 郭连波罗为马浴阳胡桢麟熊伟盛子千万青李祥友曾晓雁陆永枫
Owner HUAZHONG UNIV OF SCI & TECH
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