522 results about "Laser additive manufacturing" patented technology

The invention provides a high-precision laser additive manufacturing method and device based on metal powder melting, and relates to the technical field of metal additive manufacturing, and the high-precision laser additive manufacturing device comprises a multi-element powder supply and electrification unit which is used for carrying out independent metering supply and airflow dispersion mixing on various metal powder in an inert atmosphere environment and enabling powder particles to obtain controllable charges; the electromagnetic field cooperative control unit is used for actively regulating and controlling the falling speed and the transverse track of the powder particles through the cooperative effect of a longitudinal magnetic field and a transverse electric field when the powder particles are in a charged state; the invention provides a metal powder forming technology path based on particle size active conveying and spatial positioning, and active conveying and accurate positioning of the metal powder particles in the flying process are realized by performing electrified regulation and control on single or small-scale metal powder particles and utilizing the action of an electromagnetic field. Therefore, layer-by-layer stacking forming is completed under the condition of not depending on the whole powder laying layer.

The invention provides a post-treatment method for laser additive manufacturing of titanium alloy. The post-treatment method comprises the steps that a titanium alloy workpiece is sequentially subjected to first annealing treatment, beta heat treatment, hot isostatic pressing treatment and second annealing treatment. Through the specific process combining beta heat treatment and hot isostatic pressing treatment, comprehensive regulation and control over the stress, defects and tissue of the titanium alloy workpiece are achieved, the internal stress of the laser additive manufacturing titanium alloy workpiece is eliminated, and meanwhile the microstructure of the laser additive manufacturing titanium alloy workpiece can be regulated and controlled while most metallurgical defects are eliminated; the strength, toughness and damage tolerance performance of the titanium alloy are synergistically improved, and the service scene of the titanium alloy can meet the static strength and fatigue damage tolerance requirements at the same time.

The invention relates to the technical field of additive manufacturing, and discloses a method and equipment for restraining the crack defect of a high-temperature alloy difficult to weld in laser additive manufacturing. When the gradient of a first molten pool is larger than a preset temperature gradient threshold value, a metal powder scanning area corresponding to each layered slice of a target part can be fused through a composite laser spot; the central light spot is used for providing enough energy to melt metal powder and form a stable molten pool, and the annular light spot preheats the periphery of the molten pool to adjust temperature distribution of the molten pool. The second laser power needed by the annular light spot is determined according to the molten pool center temperature and the molten pool radius generated by the center light spot in the scanning area at the preset scanning speed, so that accurate control over the gradient and the cooling rate of the molten pool is met, the molten pool can be cooled more uniformly in the solidification process, and the solidification quality of the molten pool is improved. The defects of cracks, air holes and the like caused by high temperature gradient and high cooling rate are effectively reduced, and the problem that high-performance high-temperature alloy laser additive manufacturing cracks are difficult to weld is solved.

The present application relates to the technical fields of laser additive manufacturing, and discloses a kind of metal matrix composite composite additive manufacturing methods, comprising: the mixing of pre-prepared composite powder, substrate pretreatment, laser bottom layer cladding preparation bottom layer structure;Electron beam selective melting additive preparation main functional layer, obtain rough parts;Rough parts post-processing.The present application improves the wettability between metal matrix and TiC reinforcing phase through the transition effect of laser cladding bottom layer and hot isostatic pressing post-processing, improves the interface bonding strength, avoids the interface peeling problem under load;Through laser cladding, realize rapid bottom layer forming, electron beam selective melting ensures high-precision functional layer manufacturing, and is suitable for the integrated manufacturing of complex structure (such as hollow, thin-walled) metal matrix composite parts.

The invention discloses a method and application for ultrasonic-assisted laser additive manufacturing of a multi-scale structure coupling high-toughness aluminum alloy, and the method comprises the steps that high-Ni-content alloy steel powder is refined through high-energy ball milling, and then the refined alloy steel powder is dispersed and distributed in Al-Mg-Sc-Er-Zr alloy powder; an ultrasonic energy field is introduced to assist selective laser melting to form mixed powder, the ultrasonic energy field assists in generating nonlinear effects such as cavitation, acoustic streaming and heat effect, defects such as air holes and cracks are overcome to eliminate residual stress, and the Marlangoni effect is accelerated to increase the solidification speed; and finally, the high-strength and high-toughness aluminum alloy which has high density and is composed of micron-scale, submicron-scale and nano-scale multi-scale phase structures is prepared. The production cost is low, and the room-temperature tensile properties of the prepared high-strength and high-toughness aluminum alloy are as follows: the strength is greater than 850 MPa, and the fracture strain is greater than 6%.

The invention discloses a preparation method of ODS alloy composite powder for laser additive manufacturing. The invention belongs to the technical field of metal additive manufacturing materials, and particularly relates to a preparation method of oxide dispersion strengthening (ODS) alloy composite powder for laser additive manufacturing. The metal matrix powder is divided into two particle size intervals by taking 30 [mu] m as a particle size critical point, the metal matrix powder in the two particle size intervals is mixed with the nano oxide powder through differential acoustic resonance to form two kinds of composite powder, and the ODS alloy composite powder is obtained by mixing the two kinds of composite powder. According to the method, different high-energy acoustic resonance mixing time is adopted for coating characteristic differences caused by different masses of metal powder (smaller than or equal to 30 microns and gt; 30 microns) in different particle size intervals. And finally, the thicknesses of nano oxide coating layers of all the powder are accurately controlled to be 500 nm or below, and the risks of nano oxide agglomeration and large-size slag formation in the SLM process are remarkably reduced.

The invention provides an additive defocusing amount regulation and control device and method based on image recognition and machine learning, and relates to the technical field of laser additive manufacturing. The device comprises an industrial camera image acquisition device for acquiring molten pool and splash plume images in a laser additive manufacturing process in real time, and an image processing device for preprocessing the received images and performing feature extraction through a three-dimensional convolutional self-encoding neural network, the image recognition and data analysis module is used for carrying a to-be-processed workpiece and further determining a defocusing amount deviation value and a deviation direction; the three-dimensional real-time regulation and control workbench is used for receiving a control instruction and carrying out real-time position compensation on a to-be-processed workpiece in the X direction, the Y direction and the Z direction according to the received control instruction; and the laser energy deposition device is used for executing a laser directional energy deposition process. The method is suitable for molten pool state monitoring and laser focus regulation and control processes in a metal laser additive manufacturing process, and is particularly suitable for additive manufacturing tasks with complex curved surface structures or high compactness requirements.

The invention provides laser additive manufacturing of a FeCoNi-based soft magnetic high-entropy alloy multilayer alternate composite structure, and relates to the technical field of advanced manufacturing of soft magnetic high-entropy alloys. The laser additive manufacturing of the FeCoNi-based soft magnetic high-entropy alloy multi-layer alternate composite structure comprises the steps of respective preparation of three kinds of pre-alloyed powder, respective ball-milling preparation of two kinds of mixed powder, pretreatment of a base plate, argon protection in a forming bin and laser additive manufacturing. The FeCoNi-based soft magnetic high-entropy alloy multi-layer alternate composite structure is obtained through respective preparation of three kinds of pre-alloy powder, respective ball milling preparation of two kinds of mixed powder, pretreatment of a base plate, argon protection in a forming bin and laser additive manufacturing. The preparation method is simple and easy to operate, green and environment-friendly, low in cost, short in process, high in efficiency and beneficial to industrial large-scale production and popularization.

An electromagnetic field assisted laser additive manufacturing device and method comprises a laser cladding mechanism, an electromagnetic field regulation and control mechanism and an electromagnetic impact mechanism, the laser cladding mechanism plans and controls a deposition path of a laser cladding head through a laser cladding mechanical arm, and the electromagnetic impact mechanism plans and controls a moving path of an electromagnetic impact coil through an electromagnetic impact mechanical arm. The variable curvature characteristic of a deposition path in the additive manufacturing process is adapted; an electromagnetic field is introduced in the metal laser additive manufacturing process, a substrate is preheated through electromagnetic induction heating, a molten pool is regulated and controlled through electromagnetic force, and metallurgical defects are reduced from the source; and meanwhile, by means of high-speed pulse electromagnetic force, synchronous impact is conducted on the surfaces and the side faces of the multiple layers of welding beads with the deposition path curvature continuously changing, then metallurgical defects such as air holes, incomplete fusion and cracks in the metal laser additive manufacturing process are restrained, grains are refined, residual stress is reduced or even eliminated, and high-performance and high-precision additive manufacturing of metal forming parts is achieved.

The invention relates to the technical field of laser additive manufacturing, and provides a steel rail laser additive path control method and system.The method comprises the steps that a real-time morphology image of a molten pool is monitored and obtained; processing the real-time morphology image to obtain asymmetric characteristics of the molten pool; according to the asymmetrical characteristics, the asymmetrical distortion degree of the molten pool is calculated; according to the asymmetric distortion degree, the laser beam is controlled to perform asymmetric microscopic motion; the asymmetric microcosmic motion comprises the step of adjusting the scanning speed or residence time of a laser beam in different areas of a molten pool so as to reconstruct energy distribution in the molten pool; and according to the real-time morphology image corresponding to the molten pool after the energy distribution inside the molten pool is reconstructed, parameters of asymmetric micro-motion of the laser beam are adjusted, so that steel rail laser additive path control is achieved. The method has the effect of improving the quality, geometric accuracy and mechanical property of the steel rail laser additive repairing layer.

The invention discloses an additive manufacturing surface topography prediction method and system based on multi-source molten pool feature fusion. The method comprises the steps that a visible light image and temperature field data of a molten pool in the laser additive manufacturing process are collected; key molten pool features are extracted according to the collected visible light images and temperature field data; fusing the extracted key molten pool feature data through a grid mapping method to generate a feature matrix; scanning the surface of the formed part to obtain surface topography data, and processing the surface topography data through a grid interpolation segmentation method to generate a label matrix with the same size as the feature matrix; and using a deep learning network based on an adaptive multi-source model, taking the feature matrix as an input, taking the label matrix as an output, carrying out training, and constructing a surface topography prediction model. By means of the scheme, the surface appearance in the laser additive manufacturing process is accurately predicted in real time, and an effective monitoring and predicting means is provided for quality control of additive manufacturing.

The invention belongs to the technical field of laser additive manufacturing process control, and particularly relates to a temperature feedforward control method for a laser additive manufacturing molten pool. Comprising the following steps: step 1, acquiring a surface temperature field of an Nth layer after solidification through a thermal imaging system as an initial state T0; step 2, acquiring a scanning path of an (N + 1) th layer from a CAM system, calculating an equivalent heat dissipation index of each point on the path, and generating an EHDI sequence; 3, inputting the T0 and EHDI sequences into a pre-trained LSTM prediction model, and predicting the dynamic change of the molten pool temperature; and step 4, based on a model prediction path integral control algorithm, optimizing and generating an optimal laser power feed-forward control sequence of N + 1 layers by taking minimization of a cost function including a temperature tracking error, a power change and a power size as a target. According to the method, the path information is quantified into the EHDI sequence, the thermal dynamic state is accurately predicted through the LSTM model, the MPPI controller can'predict 'thermal disturbance before scanning is started, the optimal power scheme is generated, and feedforward accurate control over the temperature of the molten pool is achieved.

The invention discloses a preparation method of copper-based composite powder with high infrared laser absorptivity and a reaction device of the copper-based composite powder, and belongs to the technical field of metal additive manufacturing. The preparation method of the copper-based composite powder comprises the following steps that copper powder is subjected to acid pickling pretreatment, Cu2O-coated Cu powder is prepared through air suspension dynamic etching, the Cu2O-coated Cu powder is purified, and the prepared composite powder is of a core-shell structure and comprises a copper core and a cuprous oxide modified shell wrapping the surface of the copper core; by means of the structure, the absorptivity of the copper powder to near-infrared laser of 1064 nm and the like can be remarkably improved to 30% or above, and therefore the problems that pure copper is poor in melting and multiple in forming defect due to high reflectivity in laser additive manufacturing are effectively solved. The composite powder can be directly used for existing selective laser melting or directional energy deposition equipment, has great significance in achieving high-density copper part forming under medium power, and is convenient to prepare, low in cost and high in practicability.

The invention discloses a preparation method of high-toughness nickel-based alloy composite powder for additive manufacturing. The method comprises the steps that nickel-based alloy matrix powder and nanometer reinforced particles are fed into a forming cavity, under the inert atmosphere and cooling conditions, a spiral blade is driven to rotate at the high speed of 15000-30000 rpm, meanwhile, the pressure in the cavity is maintained to be 2-8 MPa, and treatment is conducted for 30-120 minutes; and through the synergistic effect of kinetic energy and high-speed airflow, combination of size selective milling and cold welding is achieved, and the core-shell structure composite powder with matrix powder evenly coated with nano-reinforced particles is prepared. According to the preparation method, ball-milling-medium-free design is adopted, powder pollution and sphericity deterioration are avoided, and the prepared composite powder has high sphericity and fluidity, is suitable for the laser additive manufacturing process and can effectively refine grains, inhibit element segregation, cooperatively improve the strength and toughness of components and solve the problem of high-plasticity inversion.

The invention relates to the field of laser processing additive manufacturing, in particular to the field of laser processing additive manufacturing of wear-resistant materials. The invention provides a laser additive manufacturing device and method for a wear-resistant material. The additive manufacturing device comprises a system controller, a laser, a beam splitter, a phase modulator, a first laser light path and a second laser light path. According to the additive manufacturing device and method, fusion of the additive material and the substrate material can be effectively promoted, the problem that due to the fact that laser is focused on a target area in the laser cladding process, the local temperature of a focus point is too high, the temperature of a surrounding area is too low, and consequently temperature distribution is uneven can be effectively solved, and the laser cladding efficiency is improved. And fusion of the additive powder, the particles and the substrate material can be promoted, and the bonding strength of the additive part and the substrate part is improved.

The invention belongs to the technical field of laser additive manufacturing, particularly relates to coaxial powder feeding laser cladding metal additive repairing equipment, and provides the following scheme aiming at the problems of high heat input, low bonding strength, large heat affected zone and the like in the existing traditional repairing technology: the coaxial powder feeding laser cladding metal additive repairing equipment comprises a double-stand-column gantry mechanism which comprises two supporting arms; the two supporting arms are fixedly connected with the same cross beam, the cross beam and the two supporting arms are provided with two symmetrical inclined supports, the cross beam is connected with a guide rail and a rack component, the rack component is meshed with a walking gear, and the cross beam is provided with a wheel box. High-precision, high-efficiency and high-quality laser additive repairing of large key components is achieved, and the problems that in a traditional repairing technology, heat input is high, bonding strength is low, and a heat affected zone is large are effectively solved.

The invention provides a laser additive manufacturing defect monitoring method, system, medium, equipment and device, and belongs to the technical field of laser additive manufacturing defect recognition. A laser additive manufacturing defect monitoring method comprises the steps that X-ray image information and sound signal information in the melting process of a laser powder bed are obtained; preprocessing the X-ray image information and the sound signal information to obtain preprocessed X-ray image information and sound signal information; marking the preprocessed X-ray image information and sound signal information to construct a data set; inputting the preprocessed X-ray image information and sound signal information into a multi-modal teacher model for training so as to obtain defect identification and positioning capability based on multi-modal information; inputting the preprocessed sound signal information into a single-mode student model to obtain a trained single-mode student model; and migrating the defect identification and positioning capability based on the multi-modal information to the trained single-modal student model through a knowledge distillation strategy.

The invention relates to the technical field of laser additive manufacturing, and discloses a laser composite additive manufacturing method for controlling molten pool flow based on pulse laser, which comprises the steps of base material treatment, powder laying, additive manufacturing, remelting, forming and post-treatment. Parameters of pulse laser and ultrasonic vibration are adjusted according to different stages of the molten pool in the material adding stage, so that convection of the molten pool is sufficient, thermal stress in the solidification stage is remarkably relieved, and the flowing speed is more uniform. And meanwhile, a remelting step is also set, and an excessive molten pool is formed on the surface of the front layer, so that the thickness of an oxide layer on the surface of the front layer is reduced, and the bonding strength among the layers is greatly improved.

The invention belongs to the technical field of laser printing, and particularly relates to a laser additive manufacturing method and a laser additive manufacturing device. The laser additive manufacturing method comprises the following steps that S1, a printing material is melted through a melt extrusion structure, the melted printing material is extruded to a bearing platform according to a preset path, and a first additive layer is formed; s2, a metal layer is laid on the first additive layer through a wire feeding structure; s3, modifying the surface of the metal layer through a laser generation structure; and S4, a second additive layer is printed on the metal layer through the melt extrusion structure, and the second additive layer covers and adheres to the metal layer and the first additive layer. The mechanical strength of the resin material can be improved, so that the interlayer bonding strength is high, obvious anisotropy is avoided, the use of a high-strength printing material is avoided, and the metal layer is beneficial to control and reduction of the printing cost.

The invention discloses a device for ultrasonic-assisted additive manufacturing of a metal workpiece, and relates to the field of laser additive manufacturing, the device comprises a circular base plate, a plurality of transducers, a synchronous stretching mechanism, a supporting box, a vibration isolation mechanism, a bearing air cylinder, a first driving motor and an ultrasonic generator, the supporting box is rotationally installed on the vibration isolation mechanism, the first driving motor is used for driving the supporting box and the circular base plate fixed to the supporting box to rotate, and the bearing air cylinder is installed on the equipment base and located on the inner side of the vibration isolation mechanism. The piston end of the bearing air cylinder penetrates through the supporting box and then is connected with the synchronous stretching mechanism through a thrust bearing, the energy converter is installed at the movable end of the synchronous stretching mechanism through a floating constant force connector, and the energy converter is connected with an ultrasonic generator through a high-frequency coaxial cable. The mechanical property of the annular rotary part during laser additive manufacturing can be improved by synchronously changing the position of the transducer.

The invention provides a laser cladding pore defect prediction method based on multi-view learning, and aims to solve the problems of single data representation, dynamic evolution information loss and the like in the existing pore prediction process. According to the system, a high-speed camera and a thermal infrared imager are integrated, a laser cladding multi-source monitoring platform is constructed, and molten pool images and temperature field data are collected in real time. Through an image processing and deep learning algorithm, geometric physical features, texture features, image depth features and temperature field features of a molten pool are extracted, and a multi-view heterogeneous feature set is constructed. And combined modeling and feature fusion of multi-view sequence data are realized in combination with a self-attention mechanism based on Vision Transform and a cross-view attention guiding module. Experimental results show that the accuracy of pore defect prediction can be effectively improved, and the method is suitable for online quality monitoring and intelligent control in the laser additive manufacturing process.

The invention relates to a nickel-based superalloy strengthening and toughening laser additive manufacturing method based on power decline, which comprises the following steps of: during layer-by-layer scanning of a laser additive, carrying out interlayer pause for 1-30 seconds after each layer is scanned, so as to inhibit material cracking; meanwhile, the first material layer is scanned at the initial laser power of 500-1500 W, and then the scanning laser power is gradually reduced by 2-15 W layer by layer, that is, on the basis of interlayer pause cooling, heat input is further reduced, heat accumulation is released, and stress accumulation is further reduced, so that material microdefects are reduced, and the mechanical property is improved; and after scanning is completed, the nickel-based high-temperature alloy with the improved strength and plasticity is obtained. According to the method, preheating is not needed, the nickel-based superalloy with excellent mechanical properties is better obtained while the period is shortened and the cost is reduced, and rapid and intelligent manufacturing of the nickel-based superalloy is facilitated.

The invention belongs to the field of tungsten alloys, and particularly relates to an energetic tungsten alloy and a preparation method thereof.The energetic tungsten alloy comprises a tungsten phase formed by tungsten and a solid solution phase formed by active metal; the mass content of the tungsten phase is not less than 75%; the active elements comprise zirconium, titanium and niobium. The tungsten content in the energetic tungsten heavy alloy manufactured in combination with laser additive manufacturing exceeds 75 wt%, on the premise that the tungsten content reaches up to 85 wt%, excellent compactness and excellent mechanical performance can still be guaranteed, the process is simple, and the production efficiency is high.

The application discloses a high-toughness titanium alloy-aluminum alloy heterogeneous material interface disordering laser additive manufacturing device and method thereof, which comprises the following steps: step one, overall planning of laser printing strategy of target part, step two, preparation of laser printing powder, step three, laser printing preparation, step four, printing and forming of titanium alloy part, step five, printing and forming of grain boundary disordering interface part, and step six, printing and forming of aluminum alloy part. The grain boundary disordering interface part is printed and formed by using the grain boundary disordering powder which is formed by mixing the metered aluminum alloy powder and metal B powder, therefore, the in-situ segregation phenomenon of B element at the grain boundary in the laser additive manufacturing process forms the disordering grain boundary layer on the interface ordered metal interface compound grain, increases the grain boundary disordering degree of the intermetallic compound, enhances the dislocation migration ability, reduces the critical stress of dislocation transmission, and thus improves the mechanical properties of the titanium alloy-aluminum alloy heterogeneous material.

The invention relates to a high-precision light powder coupling laser additive manufacturing device which comprises a powder feeding mechanism, a gas tank and a nozzle mechanism connected to a powder feeding pipe support of a laser cladding spray head assembly, the outer wall of the nozzle mechanism is connected with a single-cavity cavity, and the gas tank is communicated with the powder feeding mechanism and the single-cavity cavity through gas conveying pipes. The powder feeding mechanism is used for conveying powder into the nozzle mechanism by being matched with gas in the gas tank, and the nozzle mechanism comprises a powder gas filtering area and a screw driving area. Through the synergistic effect of the powder and gas filtering and discharging structure and screw driving, gas can be discharged to the outside when pushing powder to the spray head, the powder can be uniformly and orderly conveyed under the driving force of the screw, the powder is effectively gathered together, the problems of powder divergence and irregular arrangement are solved, and the service life of the powder is prolonged. The precision of powder conveyed to a molten pool position is improved, and the part forming quality is guaranteed; in addition, the coupling precision between the powder beam and the laser beam can be better guaranteed, and the forming precision and quality are improved.

This invention discloses a laser thermal spraying gun, belonging to the field of laser additive manufacturing technology. It includes a connecting base, an air knife assembly, an inner nozzle, an outer nozzle, a cooling jacket cover, and a cooling jacket tube. The outer nozzle includes a powder feeding body and a Laval tube. The Laval tube has diffusion holes inside. The Laval nozzle accelerates the airflow through a tapered-expanding structure, forming a high-speed, high-temperature jet environment. This ensures the powder is fully preheated and uniformly dispersed before reaching the substrate. Combining the Laval tube with laser spraying combines the advantages of laser cladding and thermal spraying technologies. The accelerated effect of the Laval airflow, under high temperature and high pressure, allows the powder to fully contact the laser heat source over a sufficiently long flight distance through the Laval nozzle. This enables the powder to form a metallurgical bond with the substrate in a molten state, achieving a bonding strength 2-3 times that of traditional thermal spraying. This method is suitable for confined spaces used in the protection and repair of turbine blades from water erosion.

The invention provides high-strength and high-toughness four-dimensional gradient stainless steel and an additive manufacturing method thereof. The additive manufacturing method comprises the following steps that S1, printing raw materials are prepared, wherein the printing raw materials comprise 316L stainless steel powder and 316L / TiC mixed powder; the preparation method of the 316L / TiC mixed powder comprises the following steps: uniformly mixing 2-6wt% of nano TiC powder and 94-98wt% of 316L stainless steel powder, putting the uniformly mixed powder into a ball mill, and carrying out grinding treatment, so that the nano TiC powder is uniformly attached to the surface of the 316L stainless steel powder; s2, laser additive manufacturing is conducted, specifically, the two kinds of powder of the printing raw materials are placed in a laser additive manufacturing device to be printed, the two kinds of powder are alternately printed during printing, and the number of printing layers of each kind of powder is 1-100 till the needed sample size is obtained; the technological parameters of laser additive manufacturing are as follows: the laser power is 150 to 500 W, the scanning speed is 400 to 1400 mm / s, the interlayer spacing is 0.04 to 0.1 mm, and the layer thickness is 0.01 to 0.05 mm; in the additive manufacturing process, argon is adopted as protective gas.

The invention relates to the technical field of laser additive manufacturing and metal wire machining, in particular to a method for predicting the metal transition state of laser wire coaxial laser fuse deposition. The method comprises the following steps: measuring the sizes and shapes of laser spots under different working distances; establishing an annular light spot laser model based on the light spot data; workpiece surface temperature distribution is calculated through finite element simulation, and model accuracy is verified by combining experimental measurement of a molten pool contour; calculating a filament energy distribution proportion according to the verified temperature distribution; the volume energy density for metal wire melting is further calculated in combination with the technological parameters, the metal transition behavior state is judged according to the density value, and whether the technological parameters are suitable for stable forming or not is evaluated. According to the method, the metal transition behavior in the laser filament coaxial laser fuse additive manufacturing process can be quantitatively predicted, the limitation that the prior art depends on a large number of trial and error is overcome, and the process development efficiency and the forming quality controllability are remarkably improved.

The invention provides a nickel-based superalloy with high cobalt and gamma'content and a preparation method and application thereof, and belongs to the technical field of superalloy additive manufacturing. The invention provides spherical nickel-based high-temperature alloy powder which comprises the following components in percentage by mass: 20 to 30 percent of Co, 8 to 10 percent of Cr, 4 to 7 percent of Al + Ti, 14 to 16 percent of W + Mo + Ta, 0 to 3.5 percent of Nb, 0.001 to 0.015 percent of B, 0.05 to 0.1 percent of C and the balance of Ni. And the spherical nickel-based superalloy powder serves as a printing raw material, laser additive manufacturing is conducted, then heat treatment is conducted, and the nickel-based superalloy with the high cobalt content and the high gamma'content is obtained. The nickel-based superalloy with high cobalt and gamma'content prepared by the method has excellent high-temperature mechanical properties and excellent printability, and is suitable for direct forming of turbine blades or additive manufacturing repair of damaged turbine blades.

The application provides a preparation method of laser additive manufacturing crack-free Ni3Al-based high-temperature alloy, comprising the following steps: (1) uniformly mixing micron-sized Ni3Al-based high-temperature alloy powder and nano Hf ceramic particles, so that the nano Hf ceramic particles are uniformly wrapped on the surface of the micron-sized Ni3Al-based high-temperature alloy powder, to obtain a composite powder; (2) drying the composite powder; (3) layer-by-layer melt forming the composite powder by using a laser directional deposition device, to obtain the laser additive manufacturing crack-free Ni3Al-based high-temperature alloy. The application also provides the laser additive manufacturing crack-free Ni3Al-based high-temperature alloy prepared by the method. The preparation method of the laser additive manufacturing crack-free Ni3Al-based high-temperature alloy can prepare the crack-free Ni3Al-based high-temperature alloy by the laser additive manufacturing method, and is simple in preparation and low in cost.