Natural magnetizing phenomenon-based austenitic stainless steel plastic damage quantitative detection method

A technology of austenitic stainless steel, quantitative detection method, applied in the direction of material magnetic variables, measuring devices, instruments, etc., can solve the problem of not giving a consistent interpretation, and achieve the effect of no surface treatment and simple operation

Inactive Publication Date: 2011-07-20
XI AN JIAOTONG UNIV
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Problems solved by technology

That is, under the condition of no external excitation magnetic field (except for geomagnetism), obvious leakage field changes can be detected in the area near the crack (hereinafter referred to as damage-induced magnetization, also known as natural magnetization phenomenon). For the mechanism of this phenomenon, Scientists have yet to come up with a consistent explanation

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  • Natural magnetizing phenomenon-based austenitic stainless steel plastic damage quantitative detection method
  • Natural magnetizing phenomenon-based austenitic stainless steel plastic damage quantitative detection method
  • Natural magnetizing phenomenon-based austenitic stainless steel plastic damage quantitative detection method

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Embodiment Construction

[0026] refer to figure 1 As shown, the measurement method of the present invention is based on the damage-induced magnetization phenomenon, that is, the damage-plastic deformation 1 inside the material will cause the leakage field 2 near the material to change. This change is picked up by the probe 3 of the micro-magnetic field measuring instrument 4 (fluxgate magnetometer) to obtain the damage-induced leakage magnetic field distribution signal; the measured leakage magnetic field distribution signal is processed by the inverse problem reconstruction optimization algorithm to obtain the internal magnetization of the material The distribution results are compared with the established damage-magnetization calibration curve 5 to determine the degree of plastic damage inside the material.

[0027] refer to figure 2 As shown, various forms of tensile specimens are made; the tensile fatigue testing machine is used to apply different loads to introduce damage 2 in the specimen; dur...

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Abstract

The invention discloses a natural magnetizing phenomenon-based austenitic stainless steel plastic damage quantitative detection method which belongs to the technical field of nondestructive detection. The method comprises the steps of establishment of a damage-magnetization calibrating curve and quantitative measurement of practical plastic damage on the basis of an austenitic stainless steel damage magnetization inducing phenomenon. The method comprises the following concrete steps of: establishing a mechanical damage-magnetization calibrating curve by a reference test; measuring natural magnetic field distribution nearby an object member by applying a fluxgate micromagnetic sensor; solving the natural magnetizing distribution inside a material by a reverse-question method and comparing the natural magnetizing distribution with the established damage-magnetization calibrating curve; and quantifying the plastic damage of the detected object. The nondestructive detection method can carry out quantitative detection on the weak magnetic austenitic stainless steel plastic damage degree and fills the blank of the austenitic stainless steel plastic damage degree detection method.

Description

technical field [0001] The invention belongs to the technical field of nondestructive testing, in particular to a quantitative detection method for plastic damage of austenitic stainless steel based on natural magnetization phenomenon. Background technique [0002] Austenitic stainless steel is non-magnetic and has high toughness, corrosion resistance and other characteristics, and has been widely used in industry. Especially in special equipment such as nuclear power plants, austenitic stainless steel is often used to make pressure vessels, pipes, valves, etc. In order to prevent serious accidents caused by the failure of equipment components, it is very important to detect the early mechanical damage before the macro defects occur. At the same time, in order to prevent the decline of economic indicators caused by excessive maintenance, it is also necessary to quantitatively detect the degree of early mechanical damage. Existing conventional non-destructive testing method...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/83G01B11/16
Inventor 陈振茂李红梅
Owner XI AN JIAOTONG UNIV
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