381 results about "Hydrogen embrittlement" patented technology

The invention discloses an intelligent early warning and hierarchical linkage disposal method for hydrogen pipeline leakage, and relates to the technical field of hydrogen pipeline safety monitoring, and the method comprises the steps: building a pipeline health fingerprint reference library, deploying a five-dimensional cooperative sensing array, synchronously collecting, purifying and processing leakage and hydrogen embrittlement signals, and extracting core feature parameters; a dynamic algorithm is utilized to quantify hydrogen embrittlement risks, a leakage point is positioned, a comprehensive decision result containing information such as risk types and levels is output, differential grading disposal is started according to the decision result, emergency resources are deployed through a resource scheduling algorithm, a disposal plan is dynamically optimized through a closed-loop feedback mechanism, and efficient management of hydrogen pipeline safety is achieved.

The invention belongs to the technical field of metal composite materials and hydrogen storage and transportation materials, and particularly relates to a high-strength hydrogen-embrittlement-resistant layered metal composite material for hydrogen storage and a preparation method and application of the high-strength hydrogen-embrittlement-resistant layered metal composite material. According to the preparation method, the nickel-saving austenitic stainless steel (NEASS) and the 30CrMo steel are alternately overlapped in a multi-layer mode, and the processes of vacuum electron beam welding, high-temperature hot rolling, accumulative ply rolling, multi-stage heat treatment and the like are combined, so that the composite board with the layer number reaching hundreds of layers, firm interface bonding, excellent mechanical performance and good hydrogen embrittlement resistance is prepared; the technical problem that strength, toughness and hydrogen brittleness resistance of an existing metal material in a high-pressure hydrogen environment are difficult to consider at the same time is solved. The obtained composite material has high strength, high plasticity and excellent hydrogen embrittlement resistance, and is suitable for structural materials of high-pressure hydrogen storage tanks, hydrogen conveying pipelines and other key hydrogen energy equipment.

The invention discloses a pickling-free cold heading Kovar alloy wire production process which comprises the following steps: S1, raw material preparation: preparing the following raw materials in percentage by mass: 41.5% of Ni, 0.5% of Co, less than or equal to 0.03% of C, less than or equal to 0.05% of Mn, less than or equal to 0.05% of Si, less than or equal to 0.02% of P, less than or equal to 0.02% of S and the balance of Fe; mixing the materials, and carrying out vacuum induction melting and electroslag remelting to prepare an alloy ingot; the alloy cast ingot is subjected to hot rolling treatment to form a hot-rolled wire rod with the diameter being 12.0-16.0 mm; s2, peeling treatment is conducted, specifically, surface layer defects of the hot-rolled wire rod in the step S1 are removed through a peeling machine; s3, dry-type drawing treatment is conducted, specifically, the hot-rolled wire rod treated in the step S2 is subjected to dry-type drawing through a dry-type drawing die to form an alloy wire; s4, intermediate annealing treatment is conducted, specifically, the alloy wire in the step S3 is placed in an annealing furnace, sufficient hydrogen is input into the annealing furnace, intermediate annealing is conducted under the hydrogen protection atmosphere, the annealing temperature is 950-1100 DEG C, and the annealing walking speed is 3-5 m / min; the surface quality and the size consistency of the wire can be improved, meanwhile, the defects of environmental pollution, hydrogen embrittlement and the like are reduced, and the use requirements of high-end precise cold heading parts are met.

The invention discloses an annular furnace heat-resistant supporting forged chassis and an additive manufacturing process and a fixing device thereof, and belongs to the technical field of plating of metal materials, and the annular furnace heat-resistant supporting forged chassis comprises the steps that heat-resistant alloy steel base metal with specific components is prepared; carrying out laser texturing and nickel-based alloy bottom layer pretreatment on the surface of the steel plate; performing laser cladding on high-silicon high-temperature alloy powder containing niobium and rare earth elements to form a functional cladding layer, and performing gradient cladding on the edge of the atmosphere guide hole; and finally, carrying out heat treatment and assembling with a fan-shaped refractory brick fixing device. A composite oxide film and a multi-scale strengthening system are constructed, hydrogen resistance and brittleness resistance are effectively achieved, interface thermal stress is relieved, cracking and stripping of a cladding layer are avoided, a fixing device adapts to thermal expansion, the atmosphere is dredged, and the annealing uniformity of a steel coil is improved; the problems of creep deformation, hydrogen embrittlement, cladding layer stripping and thermal stress cracking of a traditional supporting component under the conditions of high temperature, heavy load and nitrogen and hydrogen atmosphere are solved.

The invention discloses a hydrogen embrittlement-resistant welding wire for tailor welding of ultrahigh-strength aluminum-silicon coating hot-formed steel and a welding method, and belongs to the technical field of metal materials. 5.0%-7.0% of Ni; 0.3%-0.6% of Mo; 0.08% to 0.12% of Nb; mo, Nb and C react to form Mo2C / NbC nanophase fixed free hydrogen; 0.05%-0.1% of V: carrying out a reaction to form VC nanophase fixed free hydrogen; 0.5% to 0.8% of La; 0.3%-0.5% of Ce; 0.1%-0.5% of Ti; according to the invention, hydrogen atoms diffused in the welding process can be captured, the hydrogen content in a welding seam is obviously reduced, and the diffusible hydrogen amount is reduced by more than 40% under the hydrogen capturing effect of retained austenite, so that the hydrogen-induced crack sensitivity is reduced by 70%.

The hydrogen transmission pipeline steel comprises the following chemical components in percentage by mass: 0.020%-0.045% of C, 0.11%-0.19% of Si, 1.45%-1.65% of Mn, less than or equal to 0.0010% of S, less than or equal to 0.008% of P, 0.015%-0.045% of Al, 0.040%-0.060% of Nb, 0.020%-0.035% of Ti, 0.30%-0.50% of Cr, 0.0040%-0.0080% of RE, less than or equal to 0.004% of N, less than or equal to 0.0015% of O, less than or equal to 0.0001% of H and the balance of Fe and other inevitable impurities, the conditions that the carbon equivalent Ceq = C + Mn / 6 + (Cr) / 5 is less than or equal to 0.35%, the Nb / Ti = the rare earth element is selected from at least one of lanthanum, cerium and neodymium. The invention aims to solve the technical problems that the existing hydrogen transmission pipeline steel is easy to generate hydrogen embrittlement, short in fatigue life and high in production cost in a high-pressure hydrogen environment, and meets the core requirements of hydrogen energy long-distance transmission pipeline engineering on high strength, high hydrogen embrittlement resistance, high fatigue performance and low cost of materials.

The invention relates to the field of research on hydrogen embrittlement sensitivity of metal materials, in particular to a device for detecting hydrogen embrittlement sensitivity of a metal material in pure hydrogen and hydrogen-doped environments. The whole device is divided into an upper clamp main body and a lower clamp main body which are oppositely arranged up and down, and the upper clamp main body is provided with an upper clamp upper side through hole, an upper clamp lower side through hole, an upper clamp left side through hole, an upper clamp right side through hole and a pressed rod insertion hole. The lower part clamp main body is provided with a sample fixing groove, a sealing groove, an air cavity, a lower part clamp left side ventilation channel, a lower part clamp right side ventilation channel, a lower part clamp upper side screw hole, a lower part clamp lower side screw hole, a lower part clamp left side screw hole and a lower part clamp right side screw hole. According to the device and the method, the real working condition of contact between gas phase hydrogen and a metal material in actual engineering can be simulated, the problem of experimental cost caused by equipment requirements and sample processing can be solved, and meanwhile, the operation process of an experiment can be greatly simplified.

The invention relates to the technical field of natural gas transportation safety, in particular to a hydrogen embrittlement risk online monitoring system and method for a hydrogen-doped natural gas pipeline based on multi-parameter fusion, and the system comprises a sentry sensing unit which adopts a metal short pipe which is the same as a to-be-monitored hydrogen-doped natural gas main pipeline in property, material, process, wall thickness and service history, an internal circulating medium is kept consistent with the main pipeline; the risk sensor is provided with a multi-parameter sensor to obtain risk sensing parameters including hydrogen permeation current, pipe wall micro-strain and temperature signal parameters; the signal processing unit is connected with the sentry sensing unit, receives the risk sensing parameters and analyzes and generates hydrogen embrittlement risk indexes through a risk analysis model; and the risk warning unit is connected with the signal processing unit, and triggers a danger prompt signal when the hydrogen embrittlement risk index is greater than a preset safety index. The method has the effect of meeting the danger monitoring effectiveness of safe operation of the hydrogen-doped natural gas pipeline.

The invention relates to the technical field of optical elements, and discloses a bending-resistant multi-core indoor optical cable and a preparation method thereof. The optical cable comprises an optical fiber unit, a water blocking layer, an inner sheath, an energy dissipation layer, a hydrogen blocking layer, an outer sheath and a gradually-changed braid layer which are sequentially arranged from inside to outside. The energy dissipation layer is formed by spirally twisting a plurality of superelastic nickel-titanium alloy wires and high-strength fibers at a specific pitch, wherein the surfaces of the superelastic nickel-titanium alloy wires are coated with ceramic coatings; and the gradually-changed braid layer is a high-strength fiber braid layer of which the braid density is continuously and gradually changed along the axial direction of the optical cable in a segmented manner. According to the invention, bending mechanical energy is actively dissipated through the spirally twisted superelastic alloy wires, intelligent constraint matched with stress distribution is provided in combination with the external segmented gradient braid layer, and hydrogen embrittlement is inhibited by using a double-layer protection mechanism; the problems that an existing optical cable is prone to fracture and loss is increased sharply due to energy accumulation and stress concentration under repeated bending are systematically solved.

The invention relates to the technical field of steel smelting, in particular to a pipeline steel plate for a hydrogen embrittlement-resistant high-pressure pure hydrogen conveying pipeline and a smelting method of the pipeline steel plate. The smelting process comprises the steps of converter smelting, CAS refining, LF refining, RH refining and continuous casting. In LF refining, oxygen is determined after molten steel arrives at a station, silicon iron is added for deoxidation, and the oxygen content of the molten steel is stabilized to be 20-80 ppm; 0.10-0.35 kg of ferrozirconium is added for each ton of steel in the LF refining process, and 0.50-0.80 kg of ferrotitanium is added for each ton of steel after heating is conducted for 5-10 min. Under the equipment condition of a conventional smelting mode, through a special deoxidation mode without adding aluminum, ferrozirconium, ferrotitanium and rare earth alloy materials are added according to a specific process, and the whole process of the smelting process is optimized, so that the purity of molten steel is improved, the morphology of inclusions is improved, absorption and diffusion of hydrogen are inhibited, and a structure refining and hydrogen trap system is stably formed; the prepared pipeline steel plate shows higher hydrogen embrittlement resistance in a high-hydrogen environment, and is particularly suitable for long-term service requirements in high-pressure, variable-load and water-containing hydrogen environments.

The present invention provides a high-strength steel sheet having excellent hydrogen embrittlement resistance after spot welding, due to a novel configuration. The steel sheet of the present invention has a tensile strength of 1470 MPa or more, and the aspect ratio Str of the roughness of at least one surface is 0.

The invention provides a repairing method suitable for an engine case connecting bolt. The method comprises the following steps that S1, chemical stripping and fine treatment are conducted on the connecting bolt, an old plating layer on the surface of the connecting bolt is removed, and the surface of the connecting bolt is evenly coarsened; s2, a nitric acid-phosphoric acid binary acid system is adopted to conduct soaking treatment on the connecting bolt treated in the step S1 at the normal temperature, and a passive film on the surface of the connecting bolt is removed; s3, the connecting bolt treated in the step S2 is subjected to chemical nickel plating; and S4, the connecting bolt treated in the step S3 is subjected to hot water stabilization and dehydrogenation treatment, and the repaired connecting bolt is obtained. The invention provides a set of process from old plating layer removal, passive film removal and chemical nickel plating to hydrogen brittleness avoidance, so that the whole repair process is highly controllable, the product quality is stable and repeatable, and the problem of batch scrapping caused by batch difference and process uncontrollability in the prior art is solved.

The invention relates to corrosion-resistant spring steel for a high-speed railway elastic strip and a production method thereof, and belongs to the technical field of metallurgy. The spring steel comprises the following chemical components in percentage by mass: 0.55 to 0.60 percent of C, 1.6 to 2.0 percent of Si, 0.70 to 0.90 percent of Mn, 0.015 to 0.035 percent of P, less than or equal to 0.005 percent of S, 0.10 to 0.30 percent of Ni, 0.50 to 0.70 percent of Cr, 0.10 to 0.20 percent of Cu, 0.02 to 0.04 percent of Nb, less than or equal to 0.03 percent of Al, 0.01 to 0.03 percent of RE and the balance of Fe and inevitable impurities. The production method comprises the steps of smelting, continuous casting, heating, rolling and heat treatment. An elastic strip processed from the spring steel has the advantages of high surface decarburization resistance, excellent fatigue resistance, excellent corrosion resistance, excellent hydrogen embrittlement resistance and the like, and meets the requirements of complicated and harsh working conditions of railways.

The invention relates to the technical field of stainless steel heat treatment, in particular to a heat treatment method for improving the hydrogen embrittlement resistance of martensitic stainless steel, which comprises the following steps: a, solution treatment; the solid solution treatment comprises high-temperature solid solution treatment, low-temperature solid solution treatment and medium-temperature solid solution treatment which are sequentially carried out, so that the martensitic block interface proportion in the martensitic stainless steel is the maximum, and due to the fact that the orientation difference of the martensitic block interface is larger than that of other interfaces, more energy is needed when hydrogen-induced cracks penetrate through the type of interface, and the hydrogen-induced cracks are not prone to cracking. The martensite block interface has higher hydrogen capture capacity, the hydrogen embrittlement resistance of the martensite stainless steel is simply and effectively improved on the premise that material components are not changed, and the service life of the martensite stainless steel is guaranteed.

The present invention provides a hydrogen removal device for a steel sheet, a manufacturing system for a steel sheet, and a manufacturing method for a steel sheet, which can produce a steel sheet having excellent hydrogen embrittlement resistance without changing the mechanical properties of the steel sheet. The hydrogen removal device includes a housing portion that houses a steel sheet coil in which a steel strip is wound in a roll shape, and a vibration application device that applies vibration to the steel sheet coil housed in the housing portion in such a manner that the frequency of the vibration of the steel sheet coil is 100 to 100,000 Hz and the maximum amplitude of the steel sheet coil is 10 nm to 500 μm.

The invention discloses an in-situ metallurgical submerged-arc welding method for hydrogen storage / transportation material bypass high-nickel cold wires, and relates to the field of submerged-arc welding. The problem that hydrogen embrittlement and hydrogen induced cracking are prone to occurring in a hydrogen conveying pipe welding joint is solved. The frame body is fixed to a sliding plate of a submerged arc welding gun, the wire feeding wheel set is installed on the frame body and inputs high-nickel cold wires into a stable area of a molten pool in a stepless speed change mode, the Hall sensor detects the wire feeding speed in real time and feeds back speed signals to the servo driver of the wire feeding wheel set, and therefore closed-loop control over the wire feeding speed is achieved. According to the submerged-arc welding method, in the welding process, the bypass high-nickel cold wire is introduced, quantitative regulation and control over the nickel element content in a weld joint and accurate control over heat input of the weld joint are achieved by adjusting the wire feeding speed of the bypass high-nickel cold wire, and then the hydrogen embrittlement resistance of the weld joint is improved. The method is used for hydrogen storage / transportation material welding.

The invention belongs to the technical field of plate stamping forming, and discloses a manufacturing method of hydrogen embrittlement-resistant gigabapa-grade high-strength steel. Comprising the following steps: heating a gigabar-grade high-strength steel plate at a preset heating speed to a heat preservation temperature below a steel austenitizing starting temperature Ac1 for heat preservation, so as to obtain a pretreated plate after the temperature is uniform; the pretreated plate is subjected to stamping forming, stamping is conducted at the preset stamping speed to the shape needed by the component, and a steel part obtained after stamping forming is obtained; and cooling the stamped and formed steel part to room temperature to obtain the hydrogen embrittlement-resistant gigabapa-grade high-strength steel. Or the pretreated plate is cooled to the room temperature and then is subjected to stamping forming, and the hydrogen embrittlement-resistant KIPA-grade high-strength steel is obtained. The hydrogen embrittlement-resistant forming process is adopted, proper forming parameters can be set, the dislocation density of martensite can be reduced, carbides can be dispersed and separated out, the hydrogen embrittlement sensitivity can be remarkably inhibited while it is guaranteed that other phases of the multiphase gigabar-level high-strength steel are not changed, and key process support is provided for engineering application of the materials.

The invention relates to the technical field of hydrogen embrittlement resistance of metal materials, in particular to high-strength hydrogen embrittlement-resistant commercial pure titanium with a heterostructure and a preparation method thereof. The microstructure of the pure titanium is a heterostructure jointly formed by coarse grains, fine grains, ultra-fine grains, nanocrystalline and high-density deformation twin crystals, and the grain boundary structure of the pure titanium comprises small-angle grain boundaries and twin boundaries. An original pure titanium bar is subjected to multi-pass rotary forging deformation at the liquid nitrogen temperature, the deformed pure titanium is annealed, and the pure titanium which has heterostructures with different grain sizes and contains strong < 0001 > / / stretching direction (TD) fiber textures, a large number of small-angle grain boundaries and high-density deformation twin crystals is obtained. According to the method, the commercial pure titanium with high strength and plasticity matching and good hydrogen embrittlement resistance is obtained by combining rotary forging processing and simple annealing treatment on the commercial pure titanium, the method has the advantages of being high in operability and the like, and a new material choice is provided for design and manufacturing of high-performance ocean engineering equipment and biomedical implants.

A method for manufacturing high-strength, hydrogen-embrittlement-resistant bolts based on microsphere shot peening, and the bolts themselves, are disclosed. The manufacturing method includes: S1, cold heading and thread rolling of alloy structural steel billets to obtain bolt forming parts; S2, surface cleaning of the bolt forming parts, followed by overall surface peening with microspheres driven by high-pressure air; after overall peening, targeted strengthening peening treatment is performed on stress concentration areas such as thread roots, undercut grooves, and flange transition corners to obtain reinforced bolt parts; S3, the reinforced bolt parts are cleaned, dried, and phosphated to obtain finished bolt parts. This design, through a "overall + targeted" composite microsphere shot peening strategy, introduces a uniform residual compressive stress field and a micron-level fine-grained plastic deformation layer on the bolt surface, forming a thicker strengthening layer in stress concentration areas, significantly improving the fatigue strength and delayed fracture resistance of high-strength bolts, while ensuring uniform surface roughness and stable assembly friction coefficient.

This invention relates to a gradient surface modification method for hydrogen-resistant thick-walled pipes used in hydrogen-powered vehicles, comprising the following steps: S1: pre-treating the thick-walled metal pipe wall; S2: depositing a bottom layer on the pre-treated pipe wall surface, wherein the bottom layer is a CrN and TiN composite layer; this invention uses a Si3N4 / SiCN composite intermediate layer as the main hydrogen barrier layer, utilizing the extremely low hydrogen diffusion coefficient of Si3N4 and its dense amorphous network structure to effectively block the penetration of hydrogen atoms into the metal matrix. Simultaneously, the DLC surface layer serves as the first line of defense, utilizing its high hardness and low friction coefficient to resist the erosion and wear of high-pressure hydrogen gas flow, extending the service life of the barrier layer.

This invention discloses a test method for evaluating the hydrogen embrittlement susceptibility index of welded joints using principal component analysis, belonging to the field of material performance evaluation technology. The method includes the following steps: S1, processing the pipe welded joint into a notched round bar slow strain rate tensile specimen and conducting a slow strain rate tensile test; S2, processing the pipe welded joint into a stepped-notch CT specimen for fracture toughness and conducting a fracture toughness test; S3, calculating the specific performance loss rate under hydrogen-doped conditions and performing standardization; S4, calculating the hydrogen embrittlement susceptibility evaluation index I. PC S5. Perform scanning electron microscopy analysis on the slow strain rate tensile fracture surface to determine the risk level of hydrogen-induced cracking in the sample; S6. Determine the I-value that distinguishes different risk levels of hydrogen-induced cracking. PC Scope. This invention employs the aforementioned test method for evaluating the hydrogen embrittlement sensitivity index of welded joints using principal component analysis, which improves the statistical significance of small sample data and yields a more objective and comprehensive evaluation system for hydrogen embrittlement sensitivity.

The application relates to a neodymium-iron-boron magnet surface nano-composite coating optimization method in the field of new materials, which comprises the following steps: according to an optimization scheme for hydrogen embrittlement inhibition, local electroplating parameter adjustment is carried out on a high-porosity area of the coating, multi-layer composite deposition technology is used to optimize the coating structure, and higher uniformity of the coating microstructure data is obtained; according to final coating performance data, relevant index information of mechanical performance decline is obtained, digital evaluation of coating adhesion and strength is carried out by using a preset mechanical performance analysis model, and an optimization result of the mechanical performance is determined; according to the optimization result of the mechanical performance, all process parameters and performance data are input into a database through data integration technology, a traceable process optimization file is formed, and complete neodymium-iron-boron magnet electroplating process technology improvement records are obtained.

The application provides a high-strength and high-toughness hydrogen embrittlement resistant composite steel and a preparation method thereof. The preparation method of the composite steel comprises the following steps: obtaining a composite steel material by vacuum hot rolling of a martensitic steel and an austenitic steel in a sheath, the top layer and the bottom layer are both the martensitic steel, the middle part is the alternately stacked martensitic steel and austenitic steel, and the upper surface of the martensitic steel of the top layer and the lower surface of the martensitic steel of the bottom layer are hydrogen embrittlement resistant austenitic stainless steel. The preparation method of the application realizes a material system with high strength, high toughness and excellent hydrogen embrittlement resistance in a hydrogen-rich environment by constructing a multi-layer composite steel structure and optimizing the preparation process. The core part is high-strength martensitic hot forming steel and high-plasticity austenitic steel which are alternately compounded to form a strength and toughness synergistic structure; the upper and lower surfaces are made of low-cost hydrogen embrittlement resistant austenitic stainless steel, which effectively prevents hydrogen atoms from penetrating and inhibits crack propagation, and overcomes the mutual restriction among strength, toughness and hydrogen embrittlement resistance of single metal material.

The present application belongs to the field of aero-engine surface engineering, and particularly relates to a high-strength steel part rapid hydrogen embrittlement detection method for simultaneously performing two surface treatment processes. The method comprises the following steps: first rough machining, and then fine machining to a specified size; processing two notches on the gauge section of the test bar; performing surface treatment on the first notch and its two sides according to one process, and performing surface treatment on the second notch and its two sides according to another process; after heat treatment to eliminate hydrogen embrittlement, clamping the test bar to a testing machine, and performing sustained stretching for 200 hours under a specified load. The present application can solve the problem that different parts of an aero product need to be subjected to two surface treatment processes, and both of the two surface treatment processes need to be subjected to hydrogen embrittlement detection, and the hydrogen embrittlement detection cycle is long. The present application simultaneously performs two surface treatment processes by using one hydrogen embrittlement test bar, instead of using two hydrogen embrittlement test bars for the original two surface treatment processes.

The invention discloses a hydrogen-induced cracking molecular dynamics-cohesion cross-scale simulation method which comprises the following steps: constructing a geometric model reflecting an actual material microstructure on the basis of multi-scale structure characteristics such as grain size, grain boundary angle and the like obtained by metallographic observation and electron back scattering diffraction test; simulating a fracture process of a microscopic interface under different hydrogen concentrations through a molecular dynamics method, obtaining traction-separation data, and calibrating core parameters of the cohesion model; embedding the parameters into a polycrystalline finite element model constructed based on a Thiessen polygon to realize parameter transmission and coupling calculation from a micro scale to a micro scale; the cohesion unit accurately describes hydrogen-induced grain boundary damage and crack propagation behaviors. According to the method, through multi-scale correlation modeling and direct parameter calibration, the reliability and prediction precision of the model are remarkably improved, and a theoretical basis and an engineering applicable tool are provided for hydrogen embrittlement resistance design and service life evaluation of a hydrogen equipment material.

The present invention consists of, by mass%, C: 0.20 to 0.40%, Mn: 1.50 to 3.00%, Si: 0.90 to 1.50%, Al: 0.005 to 1.00%, V: 0.01 to 0.30%, optionally Cr: 0.01 to 1.00%, optionally Mo: 0.005 to 0.20%, optionally B: 0.00001 to 0.002%, optionally Nb and Ti: total content of 0.005 to 0.2%, P: at most 0.020%, S: at most 0.005%, N: at most 0.008%, and Fe and inevitable impurities as the balance, the total content of the impurities being 0.8% or less, and contains, by area%, 65 to 92% of primary (annealed) martensite and at least 8% of retained austenite (RA), the balance consisting of at most 27% of secondary (non-annealed) martensite, at most 10% of bainite or bainitic ferrite, and / or at most 5% of polygonal ferrite, and the total of the secondary (non-annealed) martensite, the bainite or the bainitic ferrite, and the polygonal ferrite being 27% or less, and provides a high-strength cold-rolled steel sheet product having a steel substrate and having reduced susceptibility to hydrogen embrittlement. The present invention also provides a method capable of reliably manufacturing such a steel sheet product. The abstract needs to be published without drawings.

This invention discloses a method for evaluating the hydrogen embrittlement susceptibility of high-strength mooring chains, belonging to the field of material performance evaluation technology. The method first involves taking samples from the non-welded area of ​​the chain links and subjecting them to pre-stretching treatment at a predetermined strain rate to simulate the stress history of the mooring chain's factory tensile test. Subsequently, electrochemical hydrogen charging and slow strain rate tensile tests are conducted on the samples before and after pre-straining in a simulated seawater environment. Finally, the influence of the pre-strain rate on hydrogen embrittlement susceptibility is quantitatively evaluated by analyzing the mechanical properties, fracture morphology, and hydrogen content changes of the samples. This invention, by introducing a pre-straining step, makes the evaluation conditions closer to the actual service state of the mooring chain, overcoming the limitation of traditional methods that cannot consider the influence of pre-strain, and providing a more accurate and scientific basis for the safety and reliability assessment of high-strength mooring chains.

The application discloses a hydrogen-induced cracking molecular dynamics-cohesion cross-scale simulation method, comprising the following steps: constructing a geometric model reflecting the actual microstructure of a material based on the multi-scale structure characteristics such as grain size and grain boundary angle obtained through metallographic observation and electron backscatter diffraction experiments; simulating the fracture process of a micro-interface under different hydrogen concentrations through a molecular dynamics method, obtaining traction-separation data, and calibrating the core parameters of a cohesion model; embedding the above parameters into a polycrystalline finite element model constructed based on a tessellation polygon, realizing parameter transmission and coupled calculation from a micro-scale to a meso-scale; and accurately describing hydrogen-induced grain boundary damage and crack propagation behavior through a cohesion element. The method significantly improves the reliability and prediction accuracy of the model through multi-scale correlation modeling and direct parameter calibration, and provides a theoretical basis and an engineering applicable tool for hydrogen-induced cracking resistance design and life assessment of equipment materials.

The invention belongs to the technical field of alloy hydrogen embrittlement resisting processes, and relates to a hydrogen embrittlement resisting nickel-based single crystal high-temperature alloy and a preparation method thereof. Comprising the following steps: weighing simple substance raw materials of Ni, Cr, Co, Mo, W, Ta, Al, Re, Nb, Hf and C, smelting the raw materials for multiple times to obtain a mother alloy ingot of the nickel-based single crystal superalloy, processing the mother alloy ingot into a rod, cleaning, drying, heating to a preset temperature in an argon atmosphere, preserving heat for a preset time at the preset temperature, and cooling to obtain a nickel-based single crystal superalloy test rod; the method comprises the following steps: carrying out gradient solid solution heat treatment on a nickel-based single-crystal high-temperature alloy test bar, cooling to obtain a solid-solution nickel-based single-crystal high-temperature alloy test bar, and carrying out primary aging heat treatment to obtain the hydrogen embrittlement-resistant nickel-based single-crystal high-temperature alloy. The nickel-based single crystal superalloy prepared by the method disclosed by the invention can still keep relatively high elongation and reduction of area after being charged with hydrogen, the hydrogen embrittlement sensitivity of the nickel-based single crystal superalloy is obviously lower than that of a solid solution structure, and the nickel-based single crystal superalloy shows excellent comprehensive performance.

The invention discloses equipment and a method for producing non-oriented electrical steel for a driving motor of an electric vehicle, and belongs to the technical field of metal material processing. A sheet billet continuous casting machine comprises a steel ladle, a tundish, a crystallizer, a secondary cooling device and a plurality of groups of pinch rolls; the steel ladle is used for containing molten steel after smelting, the molten steel is evenly distributed into the crystallizer through the tundish, and the crystallizer rapidly solidifies the molten steel into a sheet billet through the efficient cooling technology; the secondary cooling device is used for further cooling the sheet billet and controlling the solidification process of the sheet billet; by adopting the innovative technological process of combining continuous casting and rolling with mechanical descaling of the sheet billet, the traditional acid pickling link is canceled, the defects of acid liquor pollution and hydrogen embrittlement are fundamentally eliminated, meanwhile, the energy consumption and the production cost are remarkably reduced, and green and clean short-process production is achieved.