14 results about "Hydrogen damage" patented technology

The application relates to the technical field of steel production, in particular to a hydrogen embrittlement resistant pipeline steel and a preparation method and application thereof. The metallographic structure of the pipeline steel comprises a tempered sorbite structure and nano precipitate particles; the tempered sorbite structure comprises a ferrite matrix and carbide; the grain size of the ferrite is greater than or equal to 10 levels, and the volume fraction of the carbide is less than or equal to 10%; the diameter of the nano precipitate particles is less than or equal to 20 nm. The application solves the technical problem that the existing pipeline steel is prone to hydrogen damage in a high-pressure hydrogen environment, avoids the contradiction between high strength and hydrogen embrittlement resistance, and makes the hydrogen conveying pipeline steel have high strength, high toughness, low hardness and excellent hydrogen embrittlement resistance, so that the hydrogen conveying pipeline steel can meet the use requirements of high-pressure (greater than or equal to 10 MPa) hydrogen conveying.

The application discloses a hydrogen-doped natural gas transportation safety risk assessment method and system, relates to the technical field of hydrogen-doped natural gas pipeline safety monitoring, and comprises the following steps: initializing a safety situation assessment engine and injecting gas components; collecting pipeline strain vibration through a distributed optical fiber sensor, identifying low-frequency noise characteristics caused by hydrogen-induced material changes; superimposing and reconstructing in combination with historical corrosion crack maps to generate a mixed risk map and divide risk sections; calculating the combustible migration rate of mixed gas and the cumulative fatigue reduction coefficient of the pipeline wall material in each risk section; and quantifying risk entropy values by comprehensively considering both, thereby generating a differentiated maintenance strategy. The method can realize early identification of hydrogen damage to pipeline materials in a hydrogen-doped environment, and realizes accurate positioning and assessment of risks by fusing historical defect information, thereby providing technical support for active safety maintenance of the pipeline.

This invention discloses a system and method for monitoring the hydrogen damage state of metals, comprising: a hydrogen charging device for electrochemically charging a plate-shaped sample of the same metal as the target metal that has not undergone hydrogen damage; a hydrogen permeation measuring device for converting hydrogen atoms permeating into the sample into hydrogen ions during the hydrogen charging process and measuring the current generated by the free electrons produced during the conversion process in real time to obtain a hydrogen permeation curve; and an ultrasonic measuring device for emitting ultrasonic guided waves to the sample during the hydrogen charging process and receiving the nonlinear response signal generated by the guided waves exciting ultrasonic waves inside the sample, and then performing cepstral analysis on the received signal to obtain the nonlinear coefficients at different time periods. Based on this, combined with the hydrogen permeation curve, the correlation between the nonlinear response signal and the degree of hydrogen damage is determined, and then the nonlinear response signal of the target metal is substituted into the correlation to obtain the hydrogen damage state inside the metal. This invention can monitor and evaluate the degree of hydrogen damage inside metals in real time.

A simulation method for failure behavior of a geological hydrogen storage well pipe string based on fracture and hydrogen diffusion theory, characterized in that: the mechanical behavior experiments of the geological hydrogen storage well pipe string in the presence or absence of hydrogen environment are carried out, the fracture strain, fracture energy, hydrogen concentration and distribution, hydrogen penetration depth and stress-strain constitutive relationship of the pipe string material under different hydrogen charging times are obtained; based on the test data, the VUSDFLD subroutine is developed to calculate the hydrogen coverage, wherein the hydrogen concentration distribution control module along the pipe string wall thickness direction, the static water stress accelerated hydrogen diffusion module and the result output module need to be constructed; a three-dimensional finite element mechanical model of the geological hydrogen storage well pipe string is established, the flexible damage and burst failure criterion is used to simulate the elastic-plastic deformation, crack propagation and burst mechanical behavior of the geological hydrogen storage well pipe string, the influence law of hydrogen distribution characteristics and stress accelerated hydrogen diffusion on the failure behavior of the pipe string is analyzed, and the hydrogen damage mechanism and ultimate bearing pressure prediction of the pipe string under the synergistic action of high internal pressure and hydrogen penetration are realized.

The invention discloses a hydrogen damage test device and a detection method thereof.The hydrogen damage test device comprises an electrolyte container, an electrochemical workstation, an acoustic emission probe, an acoustic emission detector and a computer, and a metal sample, an auxiliary electrode and electrolyte are arranged in the electrolyte container; the metal sample and the auxiliary electrode are soaked in the electrolyte and are both connected with the electrochemical workstation, the non-hydrogen-filling surface of the metal sample is provided with the acoustic emission probe, the other surfaces of the metal sample except the hydrogen filling surface are sealed through resin, the acoustic emission probe is connected with the acoustic emission detector, and the electrochemical workstation and the acoustic emission detector are both connected with the computer. According to the method, acoustic emission signals are collected in real time in the electrochemical hydrogen charging process, synchronous analysis is conducted in combination with parameters of the hydrogen charging process, elastic wave signals generated by a local damage event can be captured at the moment of hydrogen-induced microcrack initiation, and therefore real-time recognition of the hydrogen crack initiation moment is achieved; and the accuracy and reliability of hydrogen damage early recognition are improved.

The invention discloses a composite coating for a high-pressure hydrogen pipeline and a preparation method and application thereof, the composite coating comprises a hydrogen storage layer and a hydrogen blocking layer, the hydrogen blocking layer is coated on the hydrogen storage layer, the material of the hydrogen storage layer is an oxide material, and the material of the hydrogen blocking layer is an inorganic-organic mixed coating. In the technical scheme provided by the invention, firstly, laser peening strengthening is carried out on the surface of the matrix to refine crystal grains and reduce the hydrogen embrittlement sensitivity of the material, then, the oxide hydrogen storage layer is arranged to effectively absorb infiltrated hydrogen atoms, and finally, the hydrogen resistance layer made of an organic polymer and a two-dimensional material is arranged on the outermost layer to effectively absorb the hydrogen atoms. And external hydrogen atoms can be prevented from entering, and meanwhile the anti-corrosion function is achieved. The composite coating can be used for the inner surface of the hydrogen conveying pipeline, the risk of hydrogen damage of the pipeline is effectively reduced, the corrosion resistance is improved, and long-period stable operation of the high-pressure hydrogen pipeline is guaranteed.

The embodiment of the invention provides a hydrogen damage assessment method, device and equipment for a circumferential weld of a high-steel-grade pipeline and a medium. The method comprises the following steps: firstly, determining hydrogen concentration data and stress data when hydrogen diffuses in a to-be-treated high-steel-grade pipeline circumferential weld, then determining a coupling relationship between hydrogen diffusion and stress according to the hydrogen concentration data, the stress data and a preset damage coupling model, and finally, determining the stress of the to-be-treated high-steel-grade pipeline circumferential weld on the basis of the coupling relationship. And evaluating the hydrogen damage of the circumferential weld of the high-steel-grade pipeline to be treated by adopting a finite element method, and determining damage information. According to the method, safety evaluation of the pipeline circumferential weld in the absence of hydrogen environment in the prior art is considered, the damage coupling model corresponding to the fracture damage constitutive of the high-steel-grade pipeline circumferential weld in the hydrogen environment considering coupling of the hydrogen medium and the complex stress state is established, and hydrogen diffusion and stress of the circumferential weld can be analyzed; and in combination with a finite element user dynamic subprogram, programming of the hydrogen damage constitutive is realized, and support is provided for accurately evaluating hydrogen damage information of the circumferential weld.

This invention provides a hydrogen pipeline damage state detection system and method based on nonlinear ultrasound. The system's nonlinear ultrasonic detection device includes a signal excitation module and a waveform receiving module. The signal excitation module uses pulsed ultrasonic signals to ultrasonically excite the test sample, achieving non-contact ultrasonic propagation to acquire the vibration signal of the detection response. The waveform receiving module analyzes the nonlinear response waveform information. The feature parameter calculation module is configured to calculate state feature parameters based on the nonlinear response waveform information. The evaluation matrix formulation module establishes hydrogen damage identification criteria based on the correlation between state feature parameters and hydrogen damage status. Furthermore, the hydrogen damage assessment module comprehensively evaluates and provides early warning of the pipeline's hydrogen damage status based on the hydrogen damage identification matrix combined with the state feature parameters of the detection response. This approach overcomes the limitations of existing technologies in terms of application scenarios and accuracy, providing a comprehensive and reliable evaluation of hydrogen damage status.

The invention belongs to the technical field of steel and iron materials and preparation thereof, and discloses a high-toughness steel plate for liquid hydrogen storage and transportation and a preparation method thereof. And the mass percentage of each chemical component is controlled and a film-shaped inverted austenite formation tendency index is met. A tempered martensite and film-shaped inverted austenite dual-phase structure is obtained through reasonable component proportion and cooperative control over high-cleanliness smelting, continuous casting, rolling and heat treatment, the volume fraction of the film-shaped inverted austenite is 8%-20%, and the volume fraction of blocky or island-shaped inverted austenite is not larger than 3%. The steel plate has the room-temperature yield strength larger than or equal to 600 MPa, the tensile strength larger than or equal to 750 MPa and the impact energy larger than or equal to 70 J at the temperature of-253 DEG C within the thickness range of 6-50 mm, the structure and performance in the thickness direction are uniform, high strength, ultralow-temperature high toughness and excellent hydrogen damage resistance are achieved, and the steel plate is suitable for liquid hydrogen storage tanks and related low-temperature pressure containers.

The application discloses a method for reducing hydrogen damage of an advanced high-strength steel laser welding joint by in-situ post-weld heat treatment, and the method comprises the following steps: constructing a database of the relationship among the plate thickness, the welding temperature, the laser spot diameter and the process parameters, and realizing efficient and low-cost in-situ post-weld heat treatment of the welding seam area and the heat affected zone by a single-beam laser, so that the carbonides are in-situ precipitated in the welding seam area and the heat affected zone of the advanced high-strength steel laser welding joint, the hydrogen atoms in the internal regions of the joint are pinned by the appropriate precipitation of the carbonides, the hydrogen diffusion capacity in each micro-zone of the high-strength steel laser welding joint is reduced, and the purpose of reducing the hydrogen damage of the advanced high-strength steel laser welding joint is achieved.

Disclosed in the present invention are a vanadium-containing high manganese steel, and a preparation method therefor and the use thereof. By combining chemical components with a controlled rolling process, the steel exhibits an excellent ultra‑low‑temperature resistance and a strong resistance to hydrogen damage, while avoiding the addition of multiple precious metal elements and simplifying the process. The present application has wide application prospects and is more suitable for manufacturing storage and transport containers for ultra-low temperature media in complex environments.

The application provides a method and device for determining hydrogen damage sensitivity of a material and a storage medium, and relates to the field of material science and engineering. The method comprises: obtaining a first parameter value of a first parameter of a target material under a target hydrogen partial pressure environment; wherein the first parameter is used to measure the hydrogen diffusion of the target material under the target hydrogen partial pressure environment; determining a second parameter value of a second parameter of the target material based on the first parameter value; wherein the second parameter is used to measure the fracture toughness of the target material under hydrogen damage caused by hydrogen diffusion; and determining the hydrogen damage sensitivity of the target material based on the first parameter value and the second parameter value. The method combines the hydrogen diffusion parameter of the reaction microscopic hydrogen transport mechanism and the fracture toughness parameter of the reaction macroscopic mechanical property, and realizes multi-dimensional evaluation of the hydrogen damage sensitivity.

This invention discloses a method, system, medium, and device for predicting the degree of hydrogen damage in steel, relating to the field of metal material damage detection technology. The method includes: constructing an experimental dataset of ultrasonic hydrogen damage in high-strength steel; constructing a numerical mechanism model of hydrogen damage and a numerical mechanism model of ultrasonic wave transmission to generate a simulation dataset of ultrasonic physics for hydrogen damage in high-strength steel; performing continuous wavelet transform on the experimental and simulation datasets to determine the corresponding time-frequency features, and constructing a feature alignment network based on an attention mechanism to fuse the time-frequency features and determine a hybrid feature vector; constructing and training a physical information neural network (PINN) with dual-channel input to obtain a prediction model for predicting the degree of hydrogen damage in steel.