Nondestructive test and evaluation method of metal member / material residual life

A metal component and evaluation method technology, which is applied in the direction of testing the ductility of materials, using sound waves/ultrasonic waves/infrasonic waves to analyze solids, etc., can solve the problems of quickly achieving non-destructive evaluation of metal components, failing to quantitatively predict the remaining life of materials, etc., to achieve The effect of fast detection speed, low detection cost and high detection accuracy

Active Publication Date: 2012-05-23
EAST CHINA UNIV OF SCI & TECH
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Problems solved by technology

It can be seen that the current non-destructive testing techniques and methods have not been able to effectively and quickly achieve the purpose of non-destructive evaluation of creep damage of metal components / materials, especially the remaining life of materials has not been quantitatively predicted.

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  • Nondestructive test and evaluation method of metal member / material residual life
  • Nondestructive test and evaluation method of metal member / material residual life

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Embodiment Construction

[0029] The technical concept of the present invention is as follows: the performance degradation of metal components / materials after fatigue loading, creep loading and other damages is closely related to the nonlinear effect of ultrasonic propagation in materials, that is, material performance degradation is always accompanied by some form of The nonlinear mechanical behavior of the material causes the generation of nonlinear harmonics in ultrasonic propagation. Dislocation String Model in metallic materials [Hikata A, Chick B, Elbaum C. Dislocation contribution to the second harmonic generation of ultrasonic waves. J.Appl.Phys.1965, 36(1): 229-236 ] think that the dislocation-to-dislocation interaction in the crystal or the internal point defects will form pinning points on the dislocation line. On these pinning points, the dislocation line is not easy to move, but in the Between two adjacent pinning points, under the action of stress, the dislocation line will produce a forc...

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Abstract

The invention discloses a nondestructive test and evaluation method of a metal member / material residual life. The method comprises steps of: acquiring a relation curve between a metal member / material residual life and an ultrasonic second harmonic normalized value; carrying out ultrasonic second harmonic signal measurement on a metal member / material to be measured and obtaining a residual life score corresponding to the measured second harmonic normalized value according to the relation curve; predicting a residual life of the metal member / material to be measured according to the residual life score and a loading time of the metal member / material to be measured. The nondestructive test and evaluation method of the metal member / material residual life of the invention can carry out detection and evaluation on creep deformation damage of a working metal member / material part, rapidly and effectively predict the residual life of the working part and provide basis for safe service of the metal member / material.

Description

technical field [0001] The invention relates to a non-destructive detection and evaluation method for the remaining life of a metal component / material. Background technique [0002] Metal materials, such as austenitic stainless steel, titanium alloys, nickel-based alloys, etc., are widely used in petrochemical, aviation, electric power, nuclear power and many other fields. Components made of these materials generally work in harsh environments, such as long-term operation at high temperatures, and these components will inevitably suffer from high-temperature creep damage, which will cause changes in the mechanical and physical properties of the material, laying the groundwork for safe production. Therefore, it is particularly necessary and urgent to monitor and detect the health of these in-service equipment or components to obtain their remaining life. How to realize rapid and effective safety detection and quantitative prediction of remaining life of metal components / mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/28G01N29/04
Inventor 轩福贞项延训刘长军王正东涂善东邝文川
Owner EAST CHINA UNIV OF SCI & TECH
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