Pipeline hydrogen embrittlement temperature threshold prediction method based on hydrogen diffusion kinetics and application

A temperature threshold and prediction method technology, applied in measuring devices, scientific instruments, instruments, etc., can solve problems such as the inability to determine the relationship between the hydrogen atom aggregation rate and temperature, the inability to quantify the impact of hydrogen embrittlement on temperature, and the indetermination

Active Publication Date: 2021-04-16
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] In summary, the inventors found that the existing research not only cannot determine the relationship between the hydrogen concentration around the crack and the temperature, but also cannot determine the relationship between the hydrogen atom accumulation rate and the temperature at the crack tip. Therefore, it is impossible to quantify the effect of temperature on hydrogen embrittlement. influences

Method used

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  • Pipeline hydrogen embrittlement temperature threshold prediction method based on hydrogen diffusion kinetics and application
  • Pipeline hydrogen embrittlement temperature threshold prediction method based on hydrogen diffusion kinetics and application
  • Pipeline hydrogen embrittlement temperature threshold prediction method based on hydrogen diffusion kinetics and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] The material of the pipeline steel is X90, and the hydrogen permeation current density test is carried out, and the results are as follows figure 1 shown. Obtain matrix hydrogen concentration according to formula (1);

[0060] The saturation number N of hydrogen atoms is obtained according to formula (4),

[0061] The selection of R value is 160nm. v is Poisson's ratio value 0.31, a o is the lattice constant l z is the actual sample thickness. Ω H The value is 1.99×10 -30 m 3 .

[0062] The relationship between temperature and diffusivity is as figure 2 shown. Through molecular dynamics simulation, the relationship between the diffusion rate of hydrogen atoms and temperature is obtained, that is, hydrogen atoms are randomly added to the body-centered cubic structure at different temperatures, and the relationship between the mean square displacement (MSD) of hydrogen atoms with time can be obtained by calculation. Substituted into formula (6),

[0063...

Embodiment 2

[0070] The hydrogen embrittlement temperature of Example 1 is verified, and the verification method is to use a device for verifying the hydrogen embrittlement temperature threshold to conduct a tensile test.

[0071] Such as Figure 5 As shown, the device for verifying the hydrogen embrittlement temperature threshold includes a corrosion box (model DC-2006), a constant temperature layer is set on the side wall of the corrosion box, and the inside of the constant temperature layer is connected to the circulating medium 2, and the corrosion box is connected to the gas outlet pipe 4 and the pH adjustment tube. 6. Thermometer 1.

[0072] Before the tensile test, the N with a purity of 99.5% was used 2 , the solution was deoxygenated for 1 h.

[0073] After deoxidation, the pipeline steel is put into the corrosion box, immersed in the NS4 solution 3, the two ends of the sample are provided with a silica gel coating 5, the sample is sealed on the corrosion box by silica gel, and ...

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Abstract

The invention belongs to the technical field of pipeline hydrogen embrittlement temperature influence prediction, and relates to a pipeline hydrogen embrittlement temperature threshold prediction method based on hydrogen diffusion kinetics and application. The method comprises the following specific steps: determining the relationship between the hydrogen concentration and temperature of a matrix in the pipeline steel by adopting a hydrogen permeation current density experiment so as to finally determine the number N of hydrogen atoms required for saturating a defect force field; determining the relationship between the diffusivity of the hydrogen atoms and the temperature through molecular dynamics simulation so as to finally determine the enrichment movement velocity V of the hydrogen atoms; and determining the hydrogen embrittlement temperature threshold value of the pipeline, and enabling the temperature at which the N / V ratio reaches the minimum value to be the most severe hydrogen embrittlement temperature. The problem of unpredictability of the influence of temperature on the service life of the pipeline is solved, and great significance is achieved for pipeline integrity management and risk evaluation.

Description

technical field [0001] The invention belongs to the technical field of prediction of the influence of hydrogen embrittlement temperature of pipelines, and in particular relates to a method and application of hydrogen embrittlement temperature threshold prediction method of pipelines based on hydrogen diffusion dynamics. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Hydrogen embrittlement of pipeline steel is caused by cathodic hydrogen evolution reaction in the corrosion process. As the temperature increases, the corrosion reaction becomes more intense, and the hydrogen atoms that are precipitated and enter the pipeline steel matrix will also increase. It can be deduced...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/00
Inventor 邢潇李凤英刘建国崔淦李自力罗小明苟金鑫于鑫张瑞宇
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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