103 results about "Crack free" patented technology

The invention discloses a corrosion-resistant and wear-resistant composite metal plate, which relates to the technical field of composite metal materials, and is technically characterized by comprising the following steps: firstly, preparing a flux-cored wire, and preparing deposited metal components according to mass percent by using a specific low-carbon steel strip; then, a thick low-carbon steel plate or a low-alloy steel plate serves as a base plate, a double-layer structure is formed through a gradient surfacing technology, a transition layer is prepared according to the proportion, a main wear-resisting layer is formed by fusing and diffusing flux-cored wires and contains various high-hardness wear-resisting phases, the lap joint width is controlled, cooling is conducted, and a surfacing composite layer is formed; the surfacing composite layer is integrally leveled through a press machine, and a semi-finished product is obtained; and finally, mixing organic silicon modified polyester resin and the like to prepare a joint sealing agent, coating the semi-finished product for 3-4 layers, and curing to obtain a finished product. The wear-resistant layer is free of cracks, and the corrosion resistance of the base body is improved.

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.

This invention provides a high-hardness, crack-free flux-cored welding wire and its preparation method. The flux-cored welding wire includes an outer sheath and a flux core. By weight, the flux core comprises the following components: boron carbide 5.6-8.6 parts; 75% ferrosilicon 3.1-4.6 parts; electrolytic manganese 0.6-1.6 parts; 80% ferrovanadium 0.3-1.2 parts; nickel powder 0.3-1.0 parts; 68% high-carbon ferrochrome 67.5-94.5 parts; and iron powder 6-6.5 parts. The preparation method of the flux-cored welding wire is as follows: [The following components are listed:] boron carbide, 75% ferrosilicon, electrolytic manganese, 80% ferrovanadium... Ferrovanadium, nickel powder, 68% high-carbon ferrochrome, and iron powder are added sequentially to a dryer and dried for 2-3 hours. The mixture is then thoroughly mixed using a three-dimensional motion mixer and placed in an insulated box for later use. The outer sheath is placed on a forming machine, which rolls the outer steel strip into a U-shaped groove. Flux-cored powder is added to the U-shaped groove, and the forming machine closes and pulls the groove to obtain the flux-cored welding wire. The flux-cored welding wire of this invention features high hardness, no cracks, high temperature resistance, and corrosion resistance. Furthermore, the low production cost of the flux-cored welding wire facilitates industrial production.

The application relates to a preparation method of an aluminum-based composite material plate. After sintering and forging, an aluminum-based composite material powder blank with a length-width ratio of 1.5-2 and a thickness of 70mm-110mm is pressed three times to prepare an aluminum-based composite material plate with a length-width ratio of 9-12 and a thickness of 10mm-35mm. The sintered blank is densified under small deformation through the first pressing, the sintered blank which has been densified is deformed in a large size under low pressure through the second pressing, the sintered blank is filled under low pressure through the third pressing, near-net-shape forming is realized, and thus the aluminum-based composite material plate without circumferential cracks and with consistent internal density is obtained.

The application discloses a method for eliminating thermal cracks in nickel-based alloy additive repair, which comprises the following steps: firstly, quantitatively analyzing elements contained in the nickel-based alloy, and simulating a solidification curve based on thermodynamics according to the elements; secondly, obtaining a CSI-fs curve based on the solidification curve; thirdly, designing a heat treatment system through thermodynamic simulation, and performing composition homogenization treatment on the nickel-based alloy; and finally, performing electron beam additive repair. Results show that the nickel-based alloy treated by the method does not produce cracks during the additive repair, i.e., the thermal cracks are eliminated, the connection is stable, and the crack-free additive repair is successfully realized.

This invention discloses a rapid generation method for rectangular disks suitable for structured meshes. This method simplifies crack propagation calculations of the disk into a parametric fracture mechanics model, enabling the calculation of stress intensity factor and crack propagation life. Specifically, finite element modeling is employed to extract the geometric boundaries of the disk and its partitions, considering the influence of geometric dimensions and boundary effects on crack propagation. Based on coordinate system transformation, using the crack initiation point and stress gradient direction as a reference, the rectangular plate can be accurately located, improving modeling efficiency. This invention simplifies the crack propagation plane into a finite-size rectangular plate. Based on boundary intersection point capture, it achieves high-fidelity equivalence between the rectangular plate model and the actual complex contour of the disk, reducing calculation errors in the boundary region using traditional methods. Furthermore, by extracting the crack-free stress distribution along the crack propagation direction on the rectangular plate, the stress intensity factor at the crack tip and crack propagation life can be calculated using the weighted function method.

This invention discloses a method for preparing high-elongation bars for cold forging, belonging to the field of aluminum alloy preparation technology. Through optimization of composition and process, the prepared bars possess high purity, uniform and fine equiaxed grain structure, and excellent plasticity, with significantly improved elongation. This meets the stringent requirements of cold forging for high material plasticity, resulting in a bright, crack-free surface and uniform grains after cold forging, overcoming problems such as oxide scale, coarse grains, and poor dimensional accuracy caused by hot forging. Furthermore, the introduction of modified talc and sodium nitrate as refining agents further promotes uniform microstructure, achieving high elongation and excellent cold forging performance.

The invention relates to a ceramic bottle crack detection method based on machine learning open set recognition, which comprises the following steps: detecting the passing of a ceramic bottle on a conveyor belt through a photoelectric sensor, and when the passing is detected, controlling a knocking hammer to knock the bottle and collecting a sound signal through a microphone; intercepting, filtering and preprocessing the sound signal, and extracting a plurality of features; performing crack open set identification in two steps, adopting an improved MFCC to train a dichotomous support vector machine to detect whether a bottle has a crack or not, respectively training five single-class support vector machines by using all features to serve as a basic model of a first layer of a stacking model, and adopting a local outlier factor as a meta-model of a second layer of the stacking model to identify the crack open set of the bottle; the stacking model is used for detecting whether abnormal noise exists or not; and 4, according to an open set identification result, if abnormal noise exists during detection, re-detection is carried out, and otherwise, the ceramic bottles with cracks are removed according to a binary classification result. The open set recognition method is adopted to remove the influence of abnormal noise on the detection result, and the detection precision is high.

The application provides a three-step forming cold extrusion process method and a forming die for a firing pin, which comprises the following steps: pre-cutting, pre-cutting two adjacent part material sheets apart by using a pre-cutting punch and a pre-cutting die; pre-forming, pressing the required material of the part into a material storage hole by using a pre-forming punch and a pre-forming die, and extruding the excess material into the extrusion area of the next working step; rough forming, rough forming of the part is completed by using a rough forming punch and a rough forming die; trimming the excess material, the material extruded in the pre-forming and rough forming steps is cut off by using a trimming punch and a trimming die, so that the edge of the material is ensured to be free of cracks; fine forming, fine forming of the steel strip is performed by using a fine forming punch and a fine forming die. The three-step forming cold extrusion process method breaks through the bottleneck in the cold extrusion forming process of small high-strength, high-precision and special-shaped metal parts, significantly improves the forming efficiency and improves the forming quality. The forming quality of the firing pin obtained by the forming die is high.

The invention discloses a metallurgical-defect-free high-temperature wear-resistant cobalt-based alloy coating and a preparation method and application thereof.The preparation method comprises the following steps that (1) Fe powder, Co powder, Cr powder, Ti powder, Mo powder and Ni powder are accurately weighed according to the stoichiometric equation Co57Fe5Ni5Cr25Ti5Mo3, and (2) the weighed powder is put into a ball milling tank to be subjected to ball milling, so that the powder is evenly mixed, and then drying, sieving and drying storage are conducted; (3) 5NiCrMo hot work die steel is selected as a base material, a sand mill is used for polishing the surface of the base material so as to remove surface oxide skin until a bright surface is exposed, and oil stains on the surface are removed; and (4) a laser directional energy deposition method in laser additive manufacturing is used for continuously depositing the crack-free cobalt-based alloy coating with high temperature resistance, wear resistance and no cracks one by one. The high-temperature wear-resistant alloy shows excellent wear resistance at a high temperature, the alloy has a shallower wear depth and a narrower grinding crack width at the high temperature, and the wear rate at the high temperature of 800 DEG C is reduced from 2.171 * 10 <-4 > mm < 3 > / N.m of a 5CrNiMo base material to 2.45 * 10 < 6 > mm < 3 > / N.m of a coating.

The invention discloses a cable tunnel flat spectrum detector, a crack measuring method and a storage medium, and relates to the technical field of tunnel cracks, and the cable tunnel flat spectrum detector comprises a flat spectrum detection module, a signal processing module, a data storage module, a data comparison and analysis module and a display. A plurality of standard crack test pieces with different crack depths or lengths and frequency spectrum characteristic information of crack-free standard test pieces are pre-stored in the data storage module; the signal processing module compares the reference spectrum of the crack-free standard test piece with the spectrum detected by the flat spectrum detection module, screens out a newly added characteristic peak and a frequency deviation peak as characteristic peaks to be detected, and calculates spectrum characteristic information; and the data comparison and analysis module is used for matching the current spectrum characteristic information with the spectrum characteristic information of the standard crack test piece in the crack parameter database to obtain crack parameters. Traditional cable tunnel detection depends on local ultrasonic flaw detection, hysteresis exists, and early-stage tiny cracks are difficult to find; in order to overcome the hysteresis, cracks are found in a full-time monitoring mode through a flat spectrum detection module.

The application discloses a method for improving the surface quality and performance of a laser cladding NiCrSiBC-WC composite coating, relates to the field of composite coating surface processing technology, and aims at solving the problem that the coating prepared through single laser cladding is prone to cracks. The method comprises the following steps: S1, pretreatment of a base material; S2, preparation of laser cladding powder; S3, laser cladding treatment; S4, temperature field auxiliary treatment; and S5, laser remelting composite temperature field auxiliary treatment. The laser remelting composite temperature field auxiliary technology can break the limitation of the WC material addition amount on the performance of the coating, and a low-WC-mass-fraction high-hardness crack-free NiCrSiBC-WC composite coating can be obtained through the technology. The structure compactness of the NiCrSiBC-WC coating is improved, and the surface hardness and bonding force of the coating are improved.

The invention provides a crack-free lithium niobate film based on a Si substrate and a growth method and application thereof, and belongs to the field of ferroelectric film growth methods. According to the crack-free lithium niobate thin film based on the Si substrate, the substrate is selected from a Si substrate, and a target material is selected from congruent lithium niobate ceramic doped with 2.0 mol%-5.0 mol% of erbium and congruent lithium niobate ceramic doped with 5.0 mol% of iron prepared by a solid-phase reaction method, or is selected from congruent lithium niobate crystal doped with 2.0 mol% of erbium and congruent lithium niobate crystal doped with 5.0 mol% of iron prepared by a Czochralski method, or is selected from congruent lithium niobate crystal doped with 5.0 mol% of erbium and congruent lithium niobate crystal doped with 5.0 mol% of iron prepared by a Czochralski method. The lithium niobate thin film shows a lithium niobate (006) characteristic diffraction peak and a lithium-deficient phase LiNb3O8 (-602) characteristic diffraction peak, the surface of the lithium niobate thin film is flat, smooth and crack-free, the problem of surface cracking of a Si-based lithium niobate thin film for a long time is solved, and the lithium niobate thin film can be used for preparing micro-cavities, electro-optical modulators, photoelectric detectors, super-surface micro-nano devices and the like and has wide application prospects. And a foundation is laid for manufacturing and researching an integrated device on a lithium niobate film sheet.

The invention belongs to the technical field of metal additive manufacturing, and discloses a method for inhibiting cracks of an additive manufacturing high-temperature alloy, which can achieve the effect of high density while realizing crack-free forming of a material. Specifically, cracks are inhibited in the high-temperature alloy additive manufacturing process through a method combining alloy component design optimization and forming process optimization, and the method is suitable for forming of high-temperature alloys of multiple additive manufacturing technologies such as selective laser melting and directional energy deposition.

This application discloses a processing apparatus and method for elliptical vibration flying cutter of complex optical surfaces. The processing apparatus includes an elliptical vibration mechanism and a flying cutter. The elliptical vibration mechanism is configured to be mounted on the spindle of a machining lathe, and the flying cutter is mounted on the elliptical vibration mechanism, with the flying cutter located outside the rotation axis of the spindle. The above-described processing apparatus and method can solve the problem of low processing efficiency in the current processing of complex surfaces such as free-form surfaces on brittle materials, where a small feed rate and depth of cut are required to obtain a crack-free surface.

This invention relates to a method for preparing a silicon nitride wear-resistant coating on the surface of a graphite part. The method involves coating the graphite part with polynitrosilane, followed by drying and subsequent decoking and high-temperature ceramization treatments. The process is precisely designed as a multi-stage heating decoking and high-temperature ceramization process. By strictly controlling the heating rate and holding time, the method avoids coating shrinkage and cracking caused by rapid heating, as well as resource waste and increased internal stress caused by excessively slow heating. Simultaneously, the decoking temperature is optimized to prevent excessive decomposition and escape of polynitrosilane or residual small molecules. This effectively solves the coating cracking problem caused by the difference in thermal expansion coefficients between graphite and silicon nitride, thereby obtaining a dense, uniform, and crack-free silicon nitride coating.

The application provides a layered preparation method and system of a diamond heat sink sheet, and the method comprises the following steps: preparing a crystal direction anchoring microstructure on a growth surface of a substrate and a moment buffer layer on a non-growth surface; obtaining a first layer of diamond through crystal direction anchoring, and generating a reverse moment on the growth surface through the moment buffer layer; removing surface defects on the diamond surface to form an atomic level step; depositing a liquid metal on the atomic level step for stress release, and then removing the liquid metal; continuously growing a second layer of diamond, and accurately controlling the stress state of the second layer of diamond; and cooling to obtain a crack-free diamond heat sink sheet. Through the synergistic process design of the diamond layering construction and the reverse moment buffer, the application blocks the path of stress accumulation and crack initiation and expansion, effectively solves the cracking problem in the preparation process of the diamond heat sink sheet, balances the process feasibility and the product performance stability, greatly improves the yield and the structural integrity of the diamond heat sink sheet, and reduces the production cost.

The invention provides a permanent magnet crack detection method and a permanent magnet crack detection device, which are characterized in that a pair of current probes are utilized to introduce stable direct current or alternating current into a permanent magnet to be detected, and one or more potential probes are utilized to measure potential differences of contact points of the probes and the permanent magnet relative to a reference end. By comparing the measured values of the to-be-measured permanent magnet and the crack-free standard permanent magnet which are the same in shape, size and material, whether current density distribution abnormity caused by cracks exists in the to-be-measured permanent magnet or not is judged, and then the crack degree of the to-be-measured permanent magnet is evaluated and screened. Compared with the existing machine vision, eddy current, ultrasonic and magnetic powder detection technologies, the method has the beneficial effects that the requirement on the surface smoothness of the permanent magnet is low, the detection depth is large, the permanent magnet is not easily interfered by the residual magnetic flux density of the permanent magnet, and the detection efficiency is high.

To provide a ferritic Fe-Cr-Al alloy powder having a chemical composition particularly adapted to additive manufacturing providing crack-free objects, and to provide a method for producing three dimensional objects using the powder.SOLUTION: The present disclosure relates to iron-chromium-aluminum (Fe-Cr-Al) powders suitable for additive manufacturing, and additive manufacturing methods. In particular, the TiN inoculant will improve the solidification structure during the additive manufacturing process, which results in an object with improved material quality, in particular an object with a more equiaxed as-solidified grain structure.SELECTED DRAWING: None

The invention provides a high-entropy alloy component and a laser direct deposition forming method thereof. The forming method comprises the following steps that high-entropy alloy powder and manganese elementary substance powder are mixed to obtain mixed powder; carrying out heat preservation on the mixed powder at a certain temperature; under the protection of inert atmosphere, cladding the pretreated mixed powder on a substrate layer by layer through a laser direct deposition technology to form a high-entropy alloy component; the obtained formed high-entropy alloy component is subjected to heat treatment under inert atmosphere protection, and the high-entropy alloy component is obtained; wherein the atomic percent x of the manganese element is more than 0 and less than or equal to 17%. According to the method, the technical bottleneck of solidification structure cracking is solved, laser direct deposition additive manufacturing of the crack-free high-toughness high-entropy alloy is achieved, the technological method is easy to implement, the cost is low, stability and robustness are good, good universality is achieved, and the method can be conveniently expanded and used in laser direct deposition additive manufacturing processes of other alloy materials.

The application discloses a high-wear-resistance additive forming titanium-based composite material and a preparation method thereof. The high-wear-resistance additive forming titanium-based composite material is mainly composed of a matrix and an amorphous ceramic film, and the mass fraction of each component of the high-wear-resistance additive forming titanium-based composite material is as follows: the matrix is 97.0-99.8%, and the amorphous ceramic film is 0.2-3%. The application can realize the quantity and size regulation of the reinforcing phase by precisely controlling the thickness and mass of the amorphous ceramic film. The introduction of the amorphous ceramic film can significantly improve the flowability and oxidation resistance of the additive manufacturing titanium alloy powder. The in-situ self-grown ceramic reinforced titanium-based composite material prepared by additive manufacturing is crack-free, has high hardness and good wear resistance, and is suitable for use under harsh working conditions.

The application provides a magnetic material internal hidden crack inductance nondestructive detection method, system and storage medium, and the method comprises the following steps: obtaining the reference inductance value of the same batch of crack-free standard samples to construct a reference inductance library reflecting batch characteristics; dynamically calibrating a qualified judgment threshold interval based on the statistical distribution of the reference inductance library; obtaining the measured inductance value of the to-be-detected sample under a preset detection condition; calculating the inductance attenuation rate based on the mean value of the reference inductance library and the measured inductance value; comparing the measured inductance value with the qualified judgment threshold interval, and matching the inductance attenuation rate with the grade threshold value in a preset crack quantization correlation model, so as to determine that the to-be-detected sample exists in the crack defect grade corresponding to the grade threshold value when the measured inductance value exceeds the qualified judgment threshold interval and the inductance attenuation rate reaches the grade threshold value. The application can nondestructively and accurately quantitatively detect the internal hidden crack of the magnetic material.

The application discloses a kind of high-strength anti-cracking refractory high-entropy alloy powder, coating and its application, compared with traditional refractory high-entropy alloy powder, by adding refractory alloy elements Nb, Mo, Ta, W, V forms BCC solid solution, ensure the strength, hardness and high temperature performance of refractory high-entropy alloy coating should have;By adding Cr, Co, Ni element forms FCC solid solution, FCC+BCC two-way organization synergistic cooperation, both improve the toughness of coating, and coordinate the local stress and strain in the process of laser cladding fast cooling, thereby reduce the cracking risk of refractory high-entropy alloy coating in the process of laser cladding, improve its crack resistance.The application of the strong anti-cracking refractory high-entropy alloy coating in the application, mainly can be used for carbon steel, stainless steel, nickel-based alloy and other various materials surface strengthening, the coating has no crack, pore and inclusion and other defects, and the coating hardness exceeds 700HV.

The application relates to the technical field of alloy furnace tube preparation, and particularly discloses a preparation process of an anti-coking alloy furnace tube and application thereof. The preparation process comprises the following steps: preparing an alloy pipe blank; and bending the alloy pipe blank at a bending feeding speed of 28-50 mm / min and a bending deformation temperature of 800-1100 DEG C to obtain the anti-coking alloy furnace tube. When the alloy pipe blank is bent, the plasticity of the alloy pipe blank can be increased, the elastic modulus can be reduced, the alloy pipe blank can be more easily deformed when subjected to external force, stress can be effectively released, stress uniformity can be increased, the risk of cracks and breakage can be reduced, and the qualified rate can be improved. The anti-coking alloy furnace tube is smooth and flat on the surface, free of cracks and pinholes, and meets the MSS SP55 standard.

The invention discloses a laser powder feeding additive manufacturing device and method for an Nb-Si intermetallic compound composite material, and relates to the technical field of high-temperature structural material additive manufacturing. The method solves the problems that according to an existing method for preparing the Nb-Si intermetallic compound composite material through the laser directional energy deposition technology, due to the fact that the local temperature gradient is huge and thermal stress is too high, a formed part is prone to cracking, deformation and composition segregation, and a complete and compact component cannot be obtained. In an inert gas protection environment, dynamic preheating and post-heating heat preservation are carried out on the front area and the rear area of a laser molten pool through combination of overall preheating of a substrate and a local auxiliary heating device synchronously moving with a laser deposition head, and the temperature gradient of a deposition area is strictly controlled to be below a safety threshold value through infrared temperature measurement closed-loop control; and finally, stress release is completed through programmed slow cooling. The method is used for crack-free and high-quality near-net forming manufacturing of Nb-Si-based intermetallic compound composite material components for high-temperature structures in the aerospace field.

The application discloses a surface quenching method for medium-carbon bearing steel and belongs to the technical field of metal material heat treatment. The medium-carbon bearing steel is rapidly heated to 820-950 DEG C by using a medium-frequency induction heating mode, is kept for 15-70 seconds, is water quenched, is tempered at 150-220 DEG C, and is kept for 0.5-5 hours. The method can make the surface hardened layer depth of the medium-carbon bearing steel be greater than or equal to 10 mm, the hardness of the hardened layer be HRC 52-62, and the surface be free of cracks. The method is suitable for surface quenching heat treatment of bearing parts, can obtain a high-hardness surface layer and a favorable internal stress distribution, and can improve the wear resistance and fatigue resistance of the bearing parts while ensuring that the whole workpiece has good strength and toughness.

The invention provides a welding seam structure and a welding method of a copper / stainless steel explosion cladding plate. The welding seam structure comprises a stainless steel base layer, an aluminum bronze transition layer and an aluminum bronze cover surface layer which are formed through laser welding. The stainless steel base layer is located in the groove of the stainless steel layer, the aluminum bronze cover surface layer covers the surface of the stainless steel base layer, and the aluminum bronze transition layer is located between the aluminum bronze cover surface layer and the groove of the copper layer. According to the method, a welding seam deposited metal filling strategy of stainless steel bottoming / aluminum bronze transition and capping is adopted, the dilution rate of a welding seam is reduced by regulating and controlling laser welding process parameters, the amount of copper elements dissolved into stainless steel is reduced, crack-free fusion welding of the copper / stainless steel explosion composite plate is achieved, and the welding quality is improved. The method solves the problem that when a copper / stainless steel explosive composite plate is welded through an existing technological method, hot cracks are prone to being generated in a weld joint, and a new solution is provided for high-reliability fusion welding of the copper / stainless steel explosive composite plate.

The invention provides a laser powder bed melting anti-crack nickel-based superalloy and a preparation method thereof.The alloy is prepared from the following powder raw materials through a laser powder bed melting technology, and the powder raw materials comprise, by mass, 95%-96% of IN738LC alloy powder and 4%-5% of CoCrW alloy powder. The preparation method of the alloy comprises the steps that IN738LC alloy powder and CoCrW alloy powder are evenly mixed according to the proportion, and mixed powder is obtained; and placing the mixed powder in laser powder bed melting equipment, and forming under the protection of inert gas to obtain the laser powder bed melting crack-resistant nickel-based superalloy. According to the method, the alloy components and the solidification behavior are regulated and controlled, the liquidation crack sensitivity is remarkably reduced, and crack-free and high-density forming of the alloy can be achieved.

The application is suitable for the technical field of metal additive manufacturing, and provides a method for preparing CoCrNiAl alloy with controllable microstructure, no cracks and high strength and toughness by selective laser melting, comprising the following steps: taking raw material powders of Co 10%-50%, Cr 5%-25%, Ni 10%-50% and Al ≤12% according to atomic percentage, vacuum debinding after alloying by mixing treatment to obtain alloy powders with uniform composition; performing selective laser melting forming on the obtained alloy powders to obtain a printing state alloy by optimizing printing process parameters; and performing heat treatment on the obtained printing state alloy to obtain CoCrNiAl alloy with controllable microstructure, no cracks and high strength and toughness, wherein the CoCrNiAl alloy prepared by the application has the characteristics of controllable microstructure, no cracks, high strength and high toughness, and is suitable for the application requirements of complex structure high-performance parts in the fields of aerospace, nuclear industry and the like.

This invention relates to a method for preparing a thick, crack-free hardface alloy layer using a stainless steel lattice structure, comprising the following steps: S1 Substrate machining: A 316L stainless steel ingot is machined to the required cylindrical size to obtain the substrate; the surface of the substrate is ground to control the roughness; S2 Laser selective cladding of the lattice structure: A laser selective cladding process is performed on the surface of the substrate using cladding powder, and a lattice structure is printed to obtain the sample; S3 Sheath preparation and installation: A cylindrical steel sheath is prepared, and the sample is installed into the steel sheath; S4 Hardface alloy powder filling: Hardface alloy powder is filled into the lattice structure; S5 Sealing, leak detection, and vacuuming; S6 Hot isostatic pressing; S7 Sheath removal: The sheath is removed by turning, and the material is machined to a suitable size to obtain a thick, crack-free hardface alloy layer. This invention is simple and can significantly improve the service life of the hardface alloy layer and reduce replacement costs.