No-destructive testing method and no-destructive testing device for creep cavity damage of igh chromium martensitic heat-resistant steel joint

A non-destructive testing and martensitic technology, which is applied to measuring devices, processing detection response signals, using sound waves/ultrasonic waves/infrasonic waves to analyze solids, etc., can solve problems such as inability to realize timely early warning and difficulty in finding creep holes

Inactive Publication Date: 2019-01-04
WUHAN UNIV
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Problems solved by technology

[0003] In the process of type IV creep rupture, the hole first occurs in the center of the joint, so it cannot be found by surface coating metallurgy and other detection methods
Traditional linear ultrasonic testing techniques (such as longitudinal wave sound velocity method and att

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  • No-destructive testing method and no-destructive testing device for creep cavity damage of igh chromium martensitic heat-resistant steel joint
  • No-destructive testing method and no-destructive testing device for creep cavity damage of igh chromium martensitic heat-resistant steel joint
  • No-destructive testing method and no-destructive testing device for creep cavity damage of igh chromium martensitic heat-resistant steel joint

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Embodiment Construction

[0040] Below by embodiment, in conjunction with accompanying drawing, the technical scheme of the present invention is described further specifically,

[0041] The invention provides a novel non-destructive detection method for creep hole damage of joints of high-chromium martensitic heat-resistant steel, which solves the problem that the existing non-destructive detection method cannot detect. The present invention solves the detection problem of creep hole damage of new high-chromium martensitic heat-resistant steel joints by adopting nonlinear ultrasonic technology. The principle is to use high-order harmonics generated by the interaction between high-energy radio frequency pulses and internal micro-defects , to assess the degree of damage to the joint. The invention uses nonlinear ultrasonic technology to detect the degree of high-temperature creep damage of high-chromium martensitic heat-resistant steel joints, and establishes the quantitative relationship between creep h...

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Abstract

The invention provides a no-destructive testing method and a no-destructive testing device for creep cavity damage of a high chromium martensitic heat-resistant steel joint. The detection difficult problem of the creep cavity damage of a novel high chromium martensitic heat-resistant steel joint is solved by adopting a nonlinear ultrasonic technology. The damage degree of the joint is evaluated byusing high-order harmonics generated by interaction between high-energy radio frequency pulse and micro defects inside a material. According to the no-destructive testing method disclosed by the invention, the high-temperature creep damage degree of the high chromium martensitic heat-resistant steel joint is detected by using a nonlinear ultrasonic technology, and the quantitative relation between a creep cavity and nonlinear ultrasonic parameters is established, so that the quantitative evaluation of the creep cavity damage during the service of the novel high chromium martensitic heat-resistant steel joint is realized and further long-term safe operation of an ultra-thermal power unit is ensured.

Description

technical field [0001] The invention belongs to the field of metal material detection, and in particular relates to a method and a device for detecting creep hole damage of high-chromium martensitic heat-resistant steel joints. Background technique [0002] New high-chromium martensitic heat-resistant steels such as T / P91, T / P92, T / P122 and T / P911 have good thermophysical properties, thermal fatigue resistance, especially excellent high-temperature creep properties, and are ideal for manufacturing super Ideal material for main steam pipes, headers and heating surface pipes of supercritical units. However, the welded joints of this type of steel have a serious tendency of type IV creep fracture during service, which significantly reduces the high-temperature creep strength and fracture life of the joint, leading to early failure of components. Type IV creep fracture is a kind of extremely harmful brittle fracture, which is likely to cause major safety accidents. Type IV fra...

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Application Information

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IPC IPC(8): G01N29/04G01N29/44
CPCG01N29/04G01N29/4418
Inventor 王学王啸胡先龙池永斌
Owner WUHAN UNIV
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