39results about How to "Guaranteed tissue homogeneity" patented technology

The invention discloses a thick steel plate and a manufacturing method thereof, and belongs to the field of ferrous metallurgy. The method comprises the following steps of molten iron KR pre-desulfuration, converter smelting, LF refining, RH vacuum treatment, wire feeding, flexible stirring, plate blank continuous casting, plate blank reheating, rough rolling, intermediate blank temperature holding cooling, precision rolling, ACC quick cooling, steel plate straightening and stacking slow cooling, wherein in the plate blank reheating stage, the temperature is 1120-1220 DEG C, and the in-furnacetime is longer than or equal to 1.0 min/mm; in the rough rolling stage, the temperature is 1000-1080 DEG C, and the thickness of an intermediate blank after rolling is larger than 2.5 times that of asteel plate; in the precision rolling stage, the temperature is lower than or equal to 900 DEG C, the finish rolling temperature is 780-820 DEG C, and the total compression ratio in the stage is larger than or equal to 60%; in the cooling stage, the finish cooling temperature is 300-400 DEG C, and the cooling rate is 10+/-5 DEG C/s. The steel plate manufactured through the method comprises the following chemical components of, by mass percent, 0.06-0.09% of C, 0.10-0.30% of Si, 1.40-1.70% of Mn, 0.020-0.060% of Al, 0.03-0.05% of Nb, 0-0.020% of Ti, 0-0.30% of Cr, 0-0.016% of P, 0-0.005% of S,0-0.080% of N and the balance Fe and inevitable impurity elements, the carbon equivalent Ceq is equal to [C+Mn/6+(Cr+Mo+V)/5+(Cu+Ni)/15] and smaller than or equal to 0.42%, the welding crack sensitivity index CEpcm is equal to [C+Si/30+(Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B] and smaller than or equal to 0.20%, and the applicable thickness of the steel plate is 40-70 mm.

The invention discloses a rapid preparation method of a C/C composite material and belongs to the technical field of material preparation. The rapid preparation method of the C/C composite material comprises the following steps: 1) preparation of a preform; 2) heat treatment of the preform; 3) preparation of water-based graphite slurry; 4) injection of graphite slurry; 5) recharging of the graphite slurry; 6) preparation of a green body; 7) carbonization treatment; and 8) densification treatment: the C/C porous preform is densified by using one or a combination of more of a chemical gas phasepermeation process, an impregnation-carbonization process and a high temperature hot pressing process. The rapid preparation method of the C/C composite material, disclosed by the invention, has the advantages that graphite powder is uniformly introduced by using a slurry injection method without destroying the bonding strength of the carbon fiber preform; the strength and microstructure uniformity of the material green body is guaranteed on the one hand, the densification time in the later period is greatly shortened on the other hand, the cost is reduced, and the rapid preparation method issuitable for industrial production; by using the water-based graphite slurry, the cost is low and pollution is avoided; and the C/C composite material prepared by using the method has the advantages of high strength, good wear resistance and reliable high temperature performance.

The invention discloses a large-format multi-laser variable-interface scanning method based on additive manufacturing of a powder bed. The technical key points are that the method comprises the following steps including the first step of performing region division on a large-format dual-laser working face based on the additive manufacturing of the powder bed, the second step of rotating diagonal lines around a central point, wherein the rotary angle is changed along with the change of a model layer number, and the third step of performing slicing and layering on the 3D models of parts according to the layer thickness parameter required by a selective laser melting additive manufacturing process, and numbering each layer sheet. By adopting the technical scheme, the large-format scanning andfilling is realized by multi-laser combination, the functions of designing a scan path and parameters of the regions in multimodel layers is realized, the critical technical difficult problems abouttissue uniformity, stress, deformation and the like of formed parts in the central and marginal regions of a selective laser melting forming cylinder are effectively solved, and the tissue uniformityof the formed parts in central and marginal regions of the forming cylinder is ensured.

The invention discloses brazing filler metal for vacuum brazing of high-nitrogen steel. The brazing filler metal for vacuum brazing of the high-nitrogen steel is composed of, by weight, 25-28 parts ofPd, 39-46 parts of Ni, 36-39 parts of Cr, 2.8-5.8 parts of vanadium plated nickel graphene, 12-15 parts of Mn, 7-11 parts of Re, 6-9 parts of Si and 2-5.5 parts of B. During preparation, a method comprises the following steps that firstly, distilled water, a water-based binding agent, acetone and ethyl alcohol are weighed, raw material alloy powder of the Pd, the Ni, the Cr, the vanadium plated nickel graphene, the Mn, the Re, the Si and the B is prepared according to the proportion and is ground to 106 micons-150 microns to be used; secondly, the acetone, the ethyl alcohol, the water-based binding agent and the distilled water which are obtained in the first step are arranged in a beaker and stirred, and a solution without sediment is obtained; and thirdly, 45-70 parts of the raw material alloy powder obtained in the first step is taken, 12-18 parts of an auxiliary additive is added into the 45-70 parts of the raw material alloy powder, a mixture is added into the solution obtained in the second step, stirring and vacuumizing are carried out, and the pasty brazing filler metal is prepared. According to the brazing filler metal, during brazing, the defect that in traditional welding, air holes are prone to being generated is overcome, the element of nitrogen is almost not lost, and the structure homogeneity of the high-nitrogen steel base metal is guaranteed.

The invention relates to a copper infiltration technology, and a copper infiltration material prepared through the copper infiltration technology. According to the copper infiltration technology, through the mode that a porous metal framework and an infiltration agent are simultaneously added into a selected crucible, the infiltration agent is heated and melted so as to infiltrate into pores of the metal framework, the specific temperature gradient is built in the cooling process, it is ensured that the infiltration agent provides liquid phase compensation in the metal framework from the bottom, and directional solidification is conducted from top to bottom. Through the technology, the pore filling rate and the copper infiltration uniformity of the porous metal framework can be effectivelyimproved, and the technology has the advantages that operation is easy and convenient, equipment is simple, the technology is flexible, the cost and energy consumption are low, the machining period is short, the product performance quality is good, and the percent of pass is high; a prepared anti-ablation material has the thermal shock resistance, ablation resistance and transpiration cooling effects, and can be used for solid rocket engine jet vanes, protective plates, fasteners, connection plates, throat linings and/or space counter weights, and the industrial application field of the material is further broadened.

The invention provides a preparation method for a tungsten carbide reinforced nickel-based composite coating and belongs to the technical field of laser cladding metal ceramic composites. According tothe reparation method, during laser cladding, a broad beam rectangular spot is used for laser input, the broad beam is large in beam spot area and even in energy distribution, a large-area cladding layer without an overlapping joint area is easy to achieve, coating thermal stress can be effectively relieved, cracks are reduced, and the large-area laser cladding layer can be prepared and is uniform and compact in structure and free of cracks, pores, inclusions or other defects. According to the preparation method, composite powder is fed into the surface of a substrate through a synchronous powder feeding method, and structure uniformity of the composite coating can be ensured. Process parameters of laser cladding and the adding amount of tungsten carbide in the composite powder (claddingmaterials) are controlled precisely, cracks, pores, non-molten parts and other macroscopic defects can be avoided, the problems that a cladding layer is uneven in structure, the structure of an overlapped area is worsened, and bonding strength is lowered can be solved, and thus the structure and comprehensive performance of the coating are improved.

The invention discloses a micro-titanium alloying Q355B medium-thickness steel plate and a low-cost production method therefor, and belongs to the technical field of ferrous metallurgy. The steel plate comprises the following chemical components in percentage by mass: 0.15-0.18% of C, less than or equal to 0.24% of Si, less than or equal to 1.60% of Mn, 0.020-0.045% of Al, 0.020-0.040% of Ti, lessthan or equal to 0.10% of Cr, less than or equal to 0.025% of P, less than or equal to 0.008% of S, less than or equal to 0.080% of N, and the balance of iron and inevitable impurity elements. In order to solve the technical problem that in the prior art, the continuous production rhythm can be affected due to the fact that a blank needs to be kept warm in the rolling process of a 30-40 mm medium-thickness Q355B steel plate, the micro-titanium alloying Q355B medium-thickness steel plate has the advantages that precious elements such as V, Nb and Cu are not added, controlled rolling is not needed, and the production rhythm can be greatly improved.

The invention belongs to the technical field of laser welding equipment, and particularly relates to the material strip tailor-welding equipment. The equipment comprises a machine frame, a cutting device, a material grinding device, a clamping and positioning device, a conveying device and a laser welding device, wherein the cutting device is used for cutting the material strip to be tailor-welded, the material grinding device is used for grinding the butt joint end of the material strip to be tailor-welded to remove the oxide skin, and the clamping and positioning device is used for clampingand fixing the two material strips to be tailor-welded when the butt joint ends of the two material strips to be tailor-welded are in butt joint. With a conveying path of the conveying device sequentially passing through the cutting device, the material grinding device and the clamping and positioning device, the conveying device is used for conveying the material strip to be tailor-welded from the cutting device to the material grinding device, and then to the clamping and positioning device. The laser welding device is used for connecting two material strips to be tailor-welded in a weldingmode. According to the material strip tailor-welding equipment, the two material strips to be tailor-welded, the oxide skin and the metal oxide on the surface of the welding region of the two materialstrips are removed, so that the content of the metal oxide in the welding tissue is remarkably reduced, thus preventing the whole section of the material strips formed by tailor-welding from being broken at the welding joint.

The invention discloses a normalized DH36 steel plate for wind power and a preparation method thereof. The preparation method comprises the following steps of weighing all components according to requirements, and mixing to obtain molten iron; carrying out KR mechanical stirring desulfurization on the molten iron; carrying out converter oxygen blowing smelting; carrying out LF refining; carrying out RH vacuum treatment; feeding wires; carrying out soft stirring; carrying out continuous casting on a plate blank; reheating the plate blank; carrying out rough rolling; carrying out warm-keeping cooling on an intermediate blank; carrying out finish rolling; carrying out accelerated cooling; discharging from a production line and carrying out pile cooling and discharging; carrying out ultrasonicflaw detection; carrying out shot blasting; normalizing; carrying out accelerated cooling on the steel plate; carrying out fire cutting; and warehousing. In the reheating stage of the plate blank, the heating temperature is controlled to be 1150-1250 DEG C, and the in-furnace time is not less than 1.0min/mm; the rough rolling temperature is controlled to be 1000-1100 DEG C, and the final rollingtemperature is 860-900 DEG C; and the normalizing temperature of the steel plate is 880-900 DEG C, the normalizing in-furnace time is not less than 2.0min/mm, and the cooling temperature after normalizing is 540-600 DEG C the steel plate disclosed by the invention has the advantages of good performance, low production cost, thick applicable thickness and good application prospect.

The invention discloses a high-thickness grinding wheel. The high-thickness grinding wheel is formed in the manner that a plurality of thin grinding wheels are bonded into a whole, the bonding surfaces at the bonding positions of every two adjacent thin grinding wheels are a boss and a groove, wherein the boss and the groove are matched with each other, and 3-5 thin grinding wheels are arranged. The bosses and the grooves are round and are concentric with the thin grinding wheels. The outer diameters of the bosses and the grooves are 1/4-1/3(r+R)+r, r is the inner hole size of each thin grinding wheel, and R is the outer diameter size of each thin grinding wheel. The height of the bosses and the depth of the grooves are 10-20 mm. The high-thickness grinding wheel is reasonable in design and novel in structure, the problems that an integral type high-thickness grinding wheel is high in fabrication difficulty and high in investment cost are solved, and density, hardness and organization uniformity are effectively guaranteed; and due to the fact that the bonding area is expanded, the bonding strength of the bonding surfaces is effectively improved, the success rate in the machining and detection processes is guaranteed, product quality is improved, the revolving strength of a product is effectively improved, and thus the use safety is further improved.

The invention belongs to the technical field of metallurgical materials, and relates to a manufacturing method of a high silicon titaniferous austenitic stainless steel cladding pipe. The manufacturing method successively includes the following steps of (1), smelting, (2) forging, (3) hot extrusion, (4) intermediate cold rolling and intermediate heat treatment, (5) final heat treatment, and (6) final cold rolling. According to the manufacturing method of the high silicon titaniferous austenitic stainless steel cladding pipe, the manufactured cladding pipe can meet strict requirements of alloycomposition, microstructure uniformity, dimensional accuracy and surface quality and other aspects.

The invention discloses a corrosive agent and a corrosion method for a metallographic structure of a GH4141 high-temperature alloy, belongs to the technical field of metallographic analysis of metal materials, and solves the problem that the metallographic structure of the GH4141 high-temperature alloy cannot be clearly displayed by adopting an existing corrosive agent and an existing corrosion method. The metallographic structure corrosive comprises ethyl alcohol, concentrated hydrochloric acid and ferric chloride. The ratio of each component is as follows: 50-100ml of ethanol, 15-25ml of concentrated hydrochloric acid and 5-8g of ferric chloride. By adopting the corrosive agent disclosed by the invention, the metallographic structure of the GH4141 high-temperature alloy can be quickly and clearly corroded.