4935results about "Metallic material coating processes" patented technology

Provided is a robot posture optimization and follow-up control method and system for freeform surface repair. The system includes a worn surface reverse modeling module, a worn surface initial normal vector calculation module, an initial machining trajectory and normal vector extraction module, a normal vector rotation angle polynomial regression denoising module, a machining trajectory position and posture NURBS fitting module, a position and posture trajectory curvature adaptive segmentation module, a segmented trajectory position and posture synchronization acceleration and deceleration look-ahead module, and a robotic motion and laser process coordinated control module. The method and the system realize posture optimization and follow-up control in a cladding process of the robot, and ensures the processing quality of laser repair.

The invention relates to the technical field of steel rail repair, and provides a steel rail laser additive defect detection method and system.The method comprises the steps that before laser additive repair is conducted on a steel rail damage area, a local area of a steel rail base body is instantly heated, so that an instant hot spot is formed in the corresponding local area; collecting thermal radiation attenuation information of the instantaneous hot spot; according to the thermal radiation attenuation information, the actual heat dissipation rate of the local area corresponding to the instantaneous hot spot is calculated so as to achieve detection of the steel rail damage area; according to the actual heat dissipation rate, repairing process parameters used for laser additive repairing are selected from a pre-stored process parameter combination; and carrying out laser additive repair on the damaged region of the steel rail by adopting the repair process parameters. The method has the effect of improving the quality and reliability of steel rail laser additive repair.

The invention discloses an anti-corrosion coating method for a steel structure, belongs to the technical field of metal anti-corrosion coating, and solves the problems of reduced anti-corrosion effect and short maintenance period caused by incomplete pretreatment, insufficient coating adhesive force and poor complex environment adaptability in the existing anti-corrosion coating process for the steel structure. According to the technical scheme, the method is characterized by comprising the steps that the surface of the steel structure is pretreated through chemical oil removal, sand blasting and acid pickling and phosphating; epoxy zinc-rich primer, epoxy micaceous iron oxide intermediate paint and polyurethane finish paint are sequentially sprayed, and plasma treatment is introduced in the coating of each layer so as to enhance the interface bonding force of the coating; the uniformity and the corrosion resistance of the coating are optimized by regulating and controlling spraying parameters, plasma processing power and a gas ratio; and finally, a gradient heating curing process is adopted, so that the compactness and durability of the coating are ensured. The method is mainly used for long-term anti-corrosion protection of steel structures such as bridges and buildings, and the anti-corrosion performance and the service life in a complex environment can be remarkably improved.

The invention relates to the technical field of iron wire electrogalvanizing passivation monitoring, and discloses an iron wire electrogalvanizing passivation intelligent monitoring system with self-adaptive coating thickness control, and the system comprises a coating parameter analysis module which can analyze the matching degree of the coating thickness and the passivation effect according to the equipment operation state information, and generates a parameter analysis parameter set; based on the parameter set, the passivation feature extraction module extracts a space feature value and a distribution variable quantity of a passivation film on the surface of the iron wire to generate an optimized parameter set; the thickness correlation modeling module analyzes the correlation between the coating thickness and the passivation characteristics and generates a dynamic regulation and control result; the abnormal intervention adjustment module extracts a real-time feature matching rate and the like to generate an intervention adjustment data set; and the dynamic feedback regulation and control module analyzes the linkage demand and generates a feedback data table. The system can monitor the iron wire electrogalvanizing passivation process in a self-adaptive mode, the coating thickness is accurately regulated and controlled, and the passivation effect stability and the production efficiency are improved.

The invention discloses a preparation method of a nickel-based tungsten carbide laser cladding wear-resistant gradient coating, which comprises the following steps: step 1, preparing mixed powder of a transition layer, a functional layer and a repair layer; step 2, pretreating a matrix: removing oxide skin on the surface of the matrix, polishing to be smooth, and preheating the matrix to 350-500 DEG C; step 3, sequentially preparing a first functional layer, a transition layer, a second functional layer and a repair layer by adopting a laser cladding process; and 4, coating post-treatment is conducted, specifically, the surface of the repairing layer is polished to the specified thickness, and the defect-free wear-resistant gradient coating is formed. Through gradient component layered design, the functional layer adopts high tungsten carbide content to maximize wear resistance, and the transition layer relieves thermal expansion difference between the coating and a matrix, reduces interface stress and reduces crack initiation; according to the repairing layer, micro-cracks and air holes generated in the cladding process are filled through low-hardness nickel-based components, and the compactness and surface integrity of the coating are remarkably improved.

The invention relates to a laser cladding system for mold repair and a control method of the laser cladding system, and belongs to the technical field of laser cladding. The laser cladding system comprises a central control unit; the scanning system is used for collecting a morphology signal of the surface of the workpiece and sending the signal to the central control unit; the infrared temperature measurement system is used for collecting temperature signals of a workpiece machining area and sending the signals to the central control unit; the central control unit carries out signal processing on the morphology signal and the temperature signal; the galvanometer system receives a two-dimensional deflection control instruction sent by the central control unit after signal processing; the deflector system is used for receiving a micro-angle adjusting instruction sent by the central control unit after signal processing; and the laser receives the temperature signal processed by the central control unit, adjusts laser process parameters according to the control signals of the galvanometer system and the deflector system, and processes the workpiece, so that the cladding precision, the processing stability and the automation level are remarkably improved.

The invention relates to the technical field of manufacturing and industrial process control, in particular to an intelligent control method and system for wind power bearing machining. The method comprises the following steps: acquiring monitoring data in a laser cladding process; based on the temperature dynamic prediction model, combined with the monitoring data, determining the predicted temperature of the next moment; according to the deviation between the predicted temperature and the target temperature, the adjustment amount of the laser power and the wire feeding speed is generated through optimization of a model prediction control strategy; the method also calculates a prediction residual error between the prediction temperature and the actual temperature at the next moment, and evaluates and adjusts model parameters of the dynamic temperature prediction model on line based on the prediction residual error to eliminate model mismatch; and finally, performing closed-loop control on a laser and a wire feeding system by applying the adjustment amount. According to the invention, through adaptive adjustment of the prediction model, the influence caused by sudden change of working conditions can be overcome, and the accuracy of temperature prediction is improved.

A steel sheet has a chemical composition including in wt % C: 0.2-0.4%, Mn: 0.8-2.0%, Si: 0.1-0.5%, Al: 0.01-0.1%, Ti: 0.01-0.1%, B: 0.0005-0.005%, P≤0.040%, Ca≤0.01%, S≤0.006%, N≤0.01%. The steel sheet includes from the bulk to the surface of the coated steel sheet a bulk and a skin layer occupying the outermost 10% of the thickness on either side of the bulk. The bulk includes an inclusion population in which the sum of clustering indexes of MnS and TiN / Ti(C,N) inclusions is less than or equal to 300 μm / mm2. This allows to manufacture hot pressed parts having a tensile strength equal to or greater than 1300 MPa and a bending anisotropy equal to or lower than 7°.

The invention provides a laser cladding 3D / 4D printing system and method, and the method comprises the following steps: S1, constructing a three-dimensional model of a to-be-printed piece, slicing the three-dimensional model, and generating a two-dimensional interface diagram of each layer of printing; s2, the additive manufacturing material of the current layer is melted through first laser to form a cladding layer; s3, carrying out micro-shaping on the surface of the cladding layer by using second laser, firstly carrying out micro-shaping on rough and hole defect areas on the surface of the cladding layer, and then carrying out point heat source irradiation on the surface of the cladding layer to eliminate residual stress of the cladding layer; and S4, the steps S2-S3 are repeated, the additive manufacturing process of each layer is completed, and a printed piece is obtained. According to the method, ultrafast laser shaping is carried out on the cladding layer in the laser 3D / 4D printing process, so that the problems of residual stress, interface-surface holes, uneven roughness and powder agglomeration and accumulation of the cladding layer of a laser 3D / 4D printing workpiece are solved, and the quality of the laser 3D / 4D printing workpiece is improved.

The invention belongs to the technical field of brake discs, and relates to a cast iron brake disc ceramic reinforced iron-based wear-resistant coating and a preparation method thereof.The cast iron brake disc ceramic reinforced iron-based wear-resistant coating comprises a brake disc base body, an iron-based transition coating and a composite wear-resistant coating, the composite wear-resistant coating is formed by mixing iron-based alloy powder, B4C ceramic particles and CeO2 rare earth powder; the preparation method comprises the following steps: 1, carrying out laser cladding on iron-based alloy powder on a brake disc substrate to prepare an iron-based transition coating; 2, carrying out ball milling and mixing according to a weight ratio to prepare composite wear-resistant mixed powder; 3, performing laser cladding on the iron-based transition coating with composite wear-resistant mixed powder; the B4C + CeO2 ceramic particles are mixed into the iron-based alloy powder, so that microcracks of the brake disc coating are reduced, the wear resistance and hardness are improved, dust pollution is reduced, the service life is prolonged, and the friction performance better meets the brake disc strengthening requirement.

The invention discloses a preparation method of a super hydrogen embrittlement-resistant carbon steel material based on laser surface treatment, which comprises the following steps: carrying out surface pretreatment on a carbon steel substrate, and carrying out surface pretreatment including sand blasting treatment, ultrasonic cleaning and preheating treatment; laser cladding equipment is adopted to synchronously convey alloy powder on the surface of the pretreated carbon steel matrix for alloying treatment, and an alloying layer containing carbide is formed; the laser power and the scanning speed are adjusted to conduct gradient treatment on the alloying layer, and a gradient transition layer from the surface layer to the base body is constructed; performing laser shock peening treatment on the gradient transition layer to generate a shock peening layer; step type annealing treatment is conducted on the base body obtained after impact strengthening, and the component content is monitored in real time; through the synergistic effect of the gradient alloying layer and the impact strengthening layer, a carbide hydrogen barrier and a residual compressive stress protection layer are formed on the surface layer of the material, so that the hydrogen diffusion coefficient is reduced; the gradient transition structure effectively relieves interface stress concentration, and the hydrogen embrittlement resistance of the carbon steel material is improved.

The invention discloses laser cladding repairing equipment for an exhaust valve rod of a marine main engine. The laser cladding repairing equipment comprises a rotating mechanism, a cleaning mechanism and a repairing mechanism. The rotating mechanism adopts a plurality of stepping motors to drive friction wheels, self-centering clamping and intermittent rotation of the exhaust valve rod are achieved through a hydraulic cylinder and a plane connecting rod mechanism, it is ensured that positioning is accurate, and the rotating mechanism adapts to workpieces with different diameters. The cleaning mechanism is arranged below the rotating mechanism, a centrifugal fan is used for simultaneously driving a grinding disc to rotate at a high speed to conduct surface grinding, scrap iron is discharged in time through the negative pressure suction function of the centrifugal fan, and cleaning and dust removal are integrated. And the anti-diffusion cover and the anti-diffusion plate are matched to form a local closed area, so that dust dissipation is effectively inhibited. The repairing mechanism adopts a mechanical arm to carry a laser cladding head, the curved surface of the valve rod can be tracked with high precision, and automatic cladding is completed. The equipment integrates automatic clamping, efficient cleaning, synchronous dust removal and intelligent repairing, and the automation level, the surface treatment quality and the operation safety of repairing of the exhaust valve rod are remarkably improved.

The invention discloses a corrosion-resistant aluminum alloy profile and a preparation method thereof, and belongs to the technical field of aluminum alloy profiles. By optimizing the components of the corrosion-resistant aluminum alloy, the strength of the aluminum alloy profile can be guaranteed, and the corrosion resistance of the aluminum alloy profile is positively influenced. Besides, the corrosion-resistant coating is formed on the surface of the corrosion-resistant aluminum alloy base material in a laser cladding mode, the corrosion resistance of the aluminum alloy profile can be remarkably improved while the application performance of the aluminum alloy profile is guaranteed, and in the corrosion-resistant coating, nickel powder can enhance pitting corrosion resistance and intergranular corrosion resistance, so that the corrosion resistance of the aluminum alloy profile is improved. The adhesive force with an aluminum alloy base material is improved; the boron nitride can improve the acid resistance and wear resistance of the surface of the aluminum alloy profile and block a corrosion channel; the lanthanum oxide and the cerium dioxide have a synergistic effect, so that surface grains can be refined, air holes generated in the cladding process are reduced, the compactness of the coating is improved, the compatibility with an aluminum alloy base material is promoted, and the apparent quality of the aluminum alloy profile is guaranteed.

The invention discloses a method for preparing a lithium-copper composite negative electrode by utilizing lithium slag and application, and the preparation method of the negative electrode comprises the following steps: adding the lithium slag with certain concentration after removing impurities such as Ca < 2 + >, Mg < 2 + > and Fe < 3 + > through acid treatment into metal lithium in a molten state, and fully stirring until the reaction is complete; and coating the molten metal lithium obtained after the reaction on a current collector to obtain the modified lithium metal negative electrode plate. The prepared lithium-copper composite negative electrode has a lithium-loving 3D frame structure, volume expansion in the circulation process can be inhibited, lithium oxide, lithium aluminum alloy and lithium silicon alloy existing on the 3D frame structure can serve as lithium-loving sites for uniform lithium ion deposition, lithium dendrite growth is inhibited, and long-term stable circulation of the lithium metal negative electrode is promoted.

The invention provides a fast-charging type solid-state lithium battery alloy negative electrode material, a preparation method and a solid-state lithium battery, and relates to the technical field of lithium batteries. The alloy negative electrode material comprises the following element components in percentage by mass: 30-38% of indium In, 30-35% of tin Sn, 28-35% of bismuth Bi and 0-1.5% of doping elements, crystal phases formed by the alloy negative electrode material of the fast-charging type solid-state lithium battery at least comprise two crystal phases, namely InSn4 and InBi. The alloy negative electrode material has relatively high surface capacity, lithium ion conductivity and lithium ion diffusion coefficient, lithium dendrites do not grow on a negative electrode when a solid-state lithium battery assembled by the alloy negative electrode material is charged and discharged under high current density, and the battery is high in energy density and long in cycle life.

The invention relates to the technical field of metal surface engineering, and discloses a laser cladding layer based on copper-magnesium-titanium-zirconium gradient design and a preparation method thereof.The preparation method comprises gradient structure design, a microstructure strengthening mechanism, a laser cladding process and thermal field control. By constructing a copper-magnesium-titanium component gradient transition structure and matching the thermal expansion coefficient difference between a matrix and a coating in real time, interface thermal stress accumulation can be dynamically inhibited, the crack defect caused by thermal expansion mismatch of a traditional cladding layer is avoided, ordered diffusion of elements at the interface is promoted through gradual change of gradient components, and the thermal conductivity of the cladding layer is improved. The metallurgical bonding reliability of the coating and a base body is improved, meanwhile, a stable coating is formed, the long-term service stability under the extreme working condition is guaranteed, a microstructure strengthening mechanism regulation and control means is adopted, the coating has a stable and effective protective barrier in a corrosive medium environment, and the problem of performance degradation caused by structure defects of a traditional cladding layer is solved.

A copper-aluminum composite plate material prepared by aluminum liquid continuous casting and a process thereof. The method includes: S1, heating an aluminum ingot to 700-800° C. and smelting for 1-3 h; S2, degassing smelted aluminum liquid, and keeping the temperature and standing; S3, texturing a copper strip, and then cleaning; S4, heating the pretreated copper strip to 200-650° C.; S5, under the protection of inert gas, continuously casting the treated aluminum liquid on the treated copper strip, performing quenching crystallization on a copper-aluminum composite material, and performing oxygen-free continuous casting; and S6, continuous rolling: rolling the continuously cast copper-aluminum composite material to obtain the copper-aluminum composite plate material prepared by aluminum liquid continuous casting.

The invention belongs to the technical field of metal etching, and particularly relates to an etching process of a metal radiating fin, which comprises the steps of metal plate pretreatment, photoresist coating, exposure and development, primary etching, secondary fine etching, photoresist removal and post-treatment. The method specifically comprises the following steps that firstly, a metal plate is pretreated and cleaned, specifically, the metal plate to be etched is put into a cleaning solution containing a surfactant to be subjected to ultrasonic cleaning, oil stains, dust and other impurities on the surface of the plate are removed, the temperature of the cleaning solution is controlled to range from 40 DEG C to 60 DEG C, and the ultrasonic cleaning time ranges from 10 min to 20 min; degreasing: the cleaned metal plate is immersed in a degreasing agent for degreasing treatment, and grease on the surface is further removed; the concentration of the degreasing agent is 5-10%, and the temperature is controlled to be 50-70 DEG C; and micro-etching: carrying out micro-etching treatment on the degreased metal plate so as to increase the roughness of the surface of the plate and improve the contact area and the reaction activity of the etching liquid and the metal surface.

The invention relates to the technical field of steel wire preparation, in particular to a high-strength prestressed steel wire preparation device and a use method thereof.The device comprises a pay-off mechanism, a pretreatment unit, a drawing mechanism, a heat treatment furnace, a cooling device, a stress applying mechanism, an online stress detector and a take-up mechanism; the stress applying mechanism comprises a tension roller set driven by a servo motor, a hydraulic damper and an on-line stress detector, and the on-line stress detector monitors the strain of a steel wire in real time through an optical fiber strain sensor and is linked with the PLC control system; dynamic prestress control and a multi-stage heat treatment process work cooperatively, so that the tensile strength of the steel wire stably reaches 1570 MPa or above, a closed-loop control tension system and an online detection technology are adopted, the prestress applying precision is high, automatic optimization of process parameters is achieved through an intelligent PLC system, the product percent of pass is greatly increased, and the production cost is reduced. And the energy consumption and the rejection rate are greatly reduced.

A steel sheet having a chemical composition including in wt % C: 0.2-0.4%, Mn: 0.8-2.0%, Si: 0.1-0.5%, Al: 0.01-0.1%, Ti: 0.01-0.1%, B: 0.0005-0.005%, P≤0.040%, Ca≤0.01%, S≤0.006%, N≤0.01%. The steel sheet includes from the bulk to the surface of the coated steel sheet a bulk and a skin layer occupying the outermost 10% of the thickness on either side of the bulk. The bulk is topped by a skin layer occupying the outermost 10% of the thickness on either side of the bulk, the density of TiN / Ti(C,N) inclusions in the skin being smaller than 240 particles / mm2 and the clustering index of MnS inclusions in the skin being lower than 110 μm / mm2. This allows to manufacture hot pressed parts having a tensile strength equal to or greater than 1300 MPa and a bending angle normalized to 1.5 mm and measured in the transverse direction strictly greater than 48°.

The invention discloses a preparation method for regulating and controlling the growth of a hydrophobic Cu2S nanowire material on the surface of a copper foil, and relates to the technical field of solid surface, and the preparation method comprises the following specific steps: 1) reacting the treated copper foil in a NaOH solution and an ammonium persulfate solution for 10-30 minutes, taking out the copper foil, washing the copper foil with absolute ethyl alcohol, and drying the copper foil in a drying oven for 10-30 minutes; and soaking the obtained sample in a silane coupling agent KH-570 (gamma-methacryloxy propyl trimethoxy silane) of which the concentration is 2.5% to 10% for 20 to 60 minutes. (2) reacting the sample obtained in the step (1) in a 0.1-1mol / L Na2S solution for 10-30 minutes, then taking out the sample, and continuously soaking the sample in a silane coupling agent for 20-60 minutes to obtain a hydrophobic Cu2S nanowire on the surface of a copper foil; according to the preparation method for regulating and controlling the growth of the hydrophobic Cu2S nanowire material on the surface of the copper foil, the regulation and control of the hydrophobicity of the Cu2S nanowire on the surface of the copper foil are realized by regulating and controlling the proportion of a silane coupling agent and the like; when the modified hydrophobic Cu2S nanowire is soaked in a silane coupling agent KH-570 with the mass concentration of 2.5%-10%, the contact angle of the modified hydrophobic Cu2S nanowire can reach 91.46 degrees to 129.46 degrees.

The invention provides a full-laser multi-energy-field remanufacturing device and method, and relates to the technical field of laser cladding remanufacturing, and the full-laser multi-energy-field remanufacturing device comprises a laser system, an energy field auxiliary system, a powder conveying system, a monitoring system and an intelligent management and control system; the energy field auxiliary system comprises a magnetic field generation unit and an ultrasonic vibration unit; the monitoring system is used for collecting multi-source sensing data reflecting the state of the molten pool in real time; the intelligent management and control system comprises a machine learning digital twinning module used for acquiring historical process data and receiving and performing analysis and prediction based on multi-source sensing data and the historical process data so as to generate a dynamic cooperative control instruction; and the numerical control execution module is used for receiving the control instruction and performing real-time feedback adjustment on the technological parameters of the laser system and the technological parameters of the magnetic field generation unit, the ultrasonic vibration unit and the powder conveying system according to the control instruction. And real-time and dynamic collaborative feedback regulation and control on a plurality of process units such as laser, a magnetic field, an ultrasonic field and powder feeding are realized.

The invention relates to the technical field of laser cladding repair, and provides a positioning and clamping system and method for repairing the surface of a large working roll of a steel mill based on laser cladding, a three-field coupling prediction model of a temperature field, a stress field and a displacement field is established, and a partial least squares regression algorithm is combined with a Kalman filter to realize multi-step prospective prediction. According to the predicted thermal deformation, self-adaptive compensation control is implemented through a three-layer cascade compensation mechanism composed of a hydraulic drive, a piezoelectric ceramic driver and a laser head adjusting mechanism. The system adopts a time domain, frequency domain and time-frequency domain joint analysis method to extract vibration characteristics, vibration types are classified and identified through a support vector machine, and an active-passive hybrid suppression strategy is adopted for different vibration sources. High-precision positioning and stable clamping of the large working roller in the laser cladding repairing process are achieved, and the thickness uniformity and the surface quality of a cladding layer are remarkably improved.

The invention provides a preparation method of a high-temperature wear-resistant high-entropy alloy layer with a heterostructure, and belongs to the technical field of metal materials and surface engineering thereof. According to the method, a CoCrFeNiTi high-entropy alloy cladding layer is deposited on the surface of a base body through the laser cladding technology, and the thickness of the cladding layer is controlled to be 0.5-2 mm. The component of the cladding layer is CoCrFeNiTi, the atomic ratio content of Ti is controlled not to exceed 8%, so that the structure of the cladding layer is an FCC phase, and cracking of the cladding layer induced by precipitation of a BCC phase is avoided. A high-entropy alloy cladding layer is heated to 550-950 DEG C and subjected to heat preservation for 2-4 h for annealing treatment, alloy elements in the cladding layer are promoted to be separated out, and small heterogeneous strengthening phases such as a Ni3Ti phase and a laves phase are generated in situ. According to the method, a heterogeneous strengthening structure is formed under the condition of not adding exogenous elements, the strength and hardness and high-temperature wear resistance of the cladding layer are greatly enhanced, the method has the advantages of being simple in process, low in cost, high in applicability and the like, and an effective technical scheme is provided for repairing and remanufacturing of the high-entropy alloy.

The stainless steel fastener surface passivation treatment device comprises a base and a passivation treatment box fixedly arranged on the base, a hollowed-out basket is movably installed in the passivation treatment box, and hollowed-out holes are evenly formed in the hollowed-out basket; and a plurality of layers of hollowed-out trays for placing the stainless steel fasteners are arranged in the hollowed-out basket. Accumulation blind areas between stainless steel fasteners are broken through linkage cooperation of rotation and vibration, simultaneous passivation treatment of rotation and vibration can be achieved only through one power motor, it is ensured that the surfaces of all the stainless steel fasteners can make uniform contact with passivation liquid and fully react with the passivation liquid, the defects in the prior art are overcome, and the production efficiency is improved. The passivation quality and production efficiency of the stainless steel fastener are remarkably improved, the situation that the stainless steel fastener is prone to accumulation and cannot make full contact with passivation liquid due to the fact that a simple soaking mode is adopted in the past is avoided, and therefore the service life of the whole stainless steel fastener is prolonged, and the reliability of the whole stainless steel fastener is improved.

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 provides a method and device for preparing a composite board based on laser remelting and ultrasound, and relates to the technical field of composite board preparation. The method specifically comprises the steps that a molten pool is formed on a first metal plate to be compounded through laser remelting, a fiber laying manipulator control system is started, a fiber laying manipulator is made to lay carbon fibers into the molten pool according to a preset track of a laser remelting head, ultrasonic vibration is started at the same time, and a preformed composite plate is obtained; the molten pool on the preformed composite board is solidified through a temperature control system, ultrasonic vibration is started at the same time, and a metal / carbon fiber mechanical-metallurgical composite interface is formed; and a second metal plate to be compounded is compounded through roller pressure, and the metal / fiber / metal three-layer composite plate is obtained. The device comprises a laser remelting and fiber laying manipulator, a temperature control system and an ultrasonic vibration probe. According to the invention, laser remelting and ultrasonic vibration are combined to form a metal / carbon fiber mechanical-metallurgical composite interface, so that the interface strength of the composite board is enhanced, and the practicability of the composite board is improved.

The invention relates to the field of high-temperature alloy material processing, in particular to a nickel-based high-temperature alloy GH3536 and an SLM preparation and heat treatment process thereof. Through the synergistic effect of ILR and HT, the core pain points of carbide precipitation imbalance and high-temperature instability coarsening in the GH3536 alloy formed through SLM are solved. A high-density subboundary created by the ILR drives short-distance diffusion of carbides at an HT stage to form a uniform spherical nano chain-shaped precipitated phase, so that the strength-plasticity inversion contradiction of a traditional process is broken through, and the strong-plasticity synergistic improvement of the tensile strength and the ductility is realized; the method comprises the steps that in-situ layer-by-layer laser remelting is conducted through the same technological parameters in the SLM process, and then the GH3536 high-temperature alloy is subjected to heat preservation in a vacuum furnace and cooled along with the furnace. The GH3536 high-temperature alloy prepared through the method has excellent performance, the plasticity of the GH3536 high-temperature alloy is equivalent to that of a forged piece, the strength of the GH3536 high-temperature alloy is higher than that of the forged piece, and the GH3536 high-temperature alloy has good industrial application

An alloy wheel is formed having a three dimensional configuration defining a face and recessed surfaces. The face of the wheel is machined providing a smooth surface at the face and defining an edge between the smooth surface of the face and the recessed surfaces. A nozzle element for projecting a plasma jet toward the wheel is provided. The plasma jet is projected toward the smooth surface of the face, the edge, and toward at least a portion of the recessed surfaces forming an alloy oxide at least on the face and the edge disposed between the face and the recessed surfaces. A first polymeric coating is applied over the face, the recessed surfaces and the edge disposed between the face and the recessed surfaces.

A steel sheet has a chemical composition including in wt % C: 0.2-0.4%, Mn: 0.8-2.0%, Si: 0.1-0.5%, Al: 0.01-0.1%, Ti: 0.01-0.1%, B: 0.0005-0.005%, P≤0.040%, Ca≤0.01%, S≤0.006%, N≤0.01%. The steel sheet includes from the bulk to the surface of the coated steel sheet a bulk and a skin layer occupying the outermost 10% of the thickness on either side of the bulk. The bulk includes an inclusion population in which the sum of clustering indexes of MnS and TiN / Ti(C,N) inclusions is less than or equal to 300 μm / mm2. This allows to manufacture hot pressed parts having a tensile strength equal to or greater than 1300 MPa and a bending anisotropy equal to or lower than 7°.