32 results about "Nickel-chromium-molybdenum alloy" patented technology

The invention relates to a nickel-based welding electrode which comprises the following component by weight percent (wt%): 50.0-68.0% of Ni, 18.0-23.0% of Cr, 6.0-11.0% of Mo, 3.0-6.0% of Nb, 2.50-9.00% of Fe, 0.01-0.1% of C, 0.10-1.00% of Mn, 0.010-0.10% of Si, 0.015% of S or less, 0.015% of P or less, 0.01-0.10% of Cu, 0.003-0.010% of Co and the balance of impurities. The coat of the nickel-based welding electrode comprises the following components by weight percent of the welding core: 12-18% of marble, 10-15% of fluorite, 12-18% of barium carbonate, 5.0-6.4% of rutile, 3.5-5.0% of ferroniobium, 3.3-4.5 of chromium metal powder, 0.45-0.65% of sodium carbonate, 0.45-0.65% of electrolytic manganese and 1.3-1.8% of zircon sand, and the adhesion agent is 10-20% of the total weight of the power. The nickel-based welding electrode is prepared by mixing, wrapping mixture on the welding core and baking at low and high temperature. The nickel-based welding electrode disclosed by the invention is used for nickel-chromium-molybdenum alloy steel welding, ensures that the excellent mechanical properties, the excellent corrosion resistance, the excellent thermal crack resistance and the hightensile strength of the welding seam match with those of the base material, has good welding process performance, guarantees attractive molding and can be used for the welding of the steel (with 9% of Ni) working at low temperature.

The invention discloses a nickel-chromium-molybdenum alloy automatic surfacing technology for a diesel engine cylinder head for a ship, which is used for surface hardening machining of a diesel jetting area of a combustion chamber of a cylinder head. In the technology, an automatic surfacing machine is used to carry out surfacing hardening of the nickel-chromium-molybdenum alloy on the surface of the diesel jetting area of the combustion chamber of the cylinder head with one surfacing layer, wherein the automatic surfacing machine comprises a rotating worktable which can swing and rotate and a numerical control soldering machine of which the position of a soldering gun can be adjusted. The invention changes the conventional manual surfacing mode, and realizes the automation of the nickel-chromium-molybdenum alloy surfacing technology for the cylinder head, thereby reducing the labor intensity, simplifying the technological steps, shortening the machining period and decreasing the consumption of soldering materials.

The invention discloses a manufacturing technology and device for an improved forged steel roller neck high nickel chrome molybdenum alloy cast composite roller. The roller comprises, by mass percent, 3.0%-3.6% of C, 0.60%-1.20% of Si, 0.30%-1.20% of Mn, 3.0%-5.0% of Ni, 1.0%-2.0% of Cr, 0.40%-1.2% of Mo, 0.1%-2% of W, 0.5%-1.0% of Cu, not larger than 0.05% of P, not larger than 0.03% of S, 0.04%-0.06% of Mg, 0.1%-0.3% of Nb, 0.1%-0.30% of Ti, 0.2%-0.6% of V, 0.05%-0.2% of B, 1.5%-2.5% of Ba, 1%-2% of Ca, 1%-3% of Sb, 0.02%-0.18% of N, 1.0%-2.0% of Y / RE and the balance Fe and inevitable micro elements. Yttrium base rare-earth nodulizing and Ba, Ca, and silicon iron composite inoculation are adopted, Nb, Ti, V, B and Sb are added for modification, and the mechanical performance of the roller is improved; by the adoption of the forged steel roller neck, the strength of the roller is improved, an induction heater is adopted to carry out in-mold whole heating casting on a core stick, a water cooled crystallizer is molded, a composite layer interface can be dynamically controlled, the technology is simple, the efficiency is high, power consumption is small, the cost is low, no composition segregation exists, and the service life of the roller is long.

A nickel-chromium-molybdenum alloy capable of being age hardened for improved strength while maintaining high corrosion resistance contains in weight percent 19.5 to 22 chromium, 15 to 17.5 molybdenum, up to 3 iron, up to 1.5 manganese, up to 0.5 aluminum, up to 0.02 carbon, up to 0.015 boron, up to 0.5 silicon, up to 1.5 tungsten and up to 0.5 of each of hafnium, tantalum and zirconium, with a balance of nickel and impurities. Certain alloying elements must be present in amounts according to an equation here disclosed.

The invention provides a nickel-chromium-molybdenum alloy welding wire for surfacing welding of ball valves. The nickel-chromium-molybdenum alloy welding wire includes the following chemical components including, by mass percentage, 0.01% of C, not larger than 0.3% of Si, not larger than 0.5% of Mn, not larger than 0.015% of P, not larger than 0.01% of S, not larger than 0.2% of Al, not larger than 0.3% of Ti, 21.5%-22.2% of Cr, not larger than 0.3% of Fe, 8.5%-9% of Mo, 3.5%-3.8% of the sum of Nb and Ta and the balance Ni. According to the nickel-chromium-molybdenum alloy welding wire, the type and content of elements in the alloy composition are strictly controlled, an alloy is conveniently processed into thinner welding wires, and element ratio control helps to reduce the occurrence ofhot cracks during welding; and a vacuum smelting and electroslag double smelting process is adopted, and a refining method combining high-temperature instantaneous refining and low-temperature long-term refining is adopted in the vacuum smelting process, the purity and the degassing effect are further improved, the quality and performance of alloy ingots are improved, and plasticity and impact toughness are improved.

The invention relates to a non-magnetic hard alloy powder and a method for preparing the same. The non-magnetic hard alloy powder is formed by adopting nickel-molybdenum alloy powder or nickel-chromium-molybdenum alloy powder as a binder phase, adopting tungsten carbide or chrome carbide or the mixture of the two as a hard phase, conglobating, spray drying, pelletizing and finally sintering the two phases. The non-magnetic hard alloy powder can be used for preparing non-magnetic hard alloy coating via thermal spraying process or for making non-magnetic hard alloy components in a powder metallurg method.

The invention provides a low nickel chromium molybdenum alloy cast iron wear resistanct material for profile steel straightener roll. The weight percentage of the chemical compositions of the material is as follows: 2.9 percent to 3.7 percent of C, 0.6 percent to 1.2 percent of Si, 0.4 percent to 1.2 percent of Mn, 0.6 percent to 1.2 percent of Cr, not more than 0.05 percent of Ni, not more than 0.03 percent of Mo and 0.3 percent of tension-active element B, Ti and Sb, the matching range of which is 8.5 to 11.7 : 3.8 to 5.3 : 0.9 to 1.1, remaining Fe, and unavoidable P and S microelement. The wear resistant material of the invention is mainly used for metal mould centrifugal pouring profile steel straightener roll. The cast iron white area is enlarged by adopting the tension-active element B, Ti and Sb; and the depth of the cast iron white area is more than 20mm; the hardness of the roller body work surface is more than HRc55 to 65. The summed steel passing quantity (service life) is not lower than the service life of the ordinarily adopted nickel chromium molybdenum indefinite hard iron straightener roll; therefore the cost of producing profile steel can be effectively reduced.

The invention relates to a punching hole distance adjustable compound die for a double-long-hole workpiece. The punching hole distance adjustable compound die for the double-long-hole workpiece comprises an upper mold holder and a lower mold holder opposite to the upper mold holder; the bottom of the upper mold holder is provided with a fixed punch and a movable punch in a spaced mode; the upper mold holder is provided with a dovetail groove; a dovetail block is arranged above the movable punch and located in the dovetail groove. Each punch comprises a guide portion and a working portion, wherein the guide portion is arranged below the working portion and is a conical part; an alloy ring is arranged on the periphery of the front working end face of the working portion; the alloy ring is made of low-nickel-chromium-molybdenum alloy. Through design of the fixed punch and the movable punch, double holes are be formed in a punched mode at a time by adjusting the distance between the punches according to the requirement for hole distance, so that the production efficiency is improved, the center distance between the two holes is ensured, and the machining quality of the workpiece is ensured. Through the structural design of the punches, the punching service life of the punches is prolonged, and the precision and quality of punched holes are improved.

In order to provide a nonmagnetic material for producing parts or coatings adapted for highly wear and corrosion intensive applications, said material comprising preformed particles made of tungsten carbide which are embedded in a metal phase made of a Ni-based alloy. It is suggested that the weight portion of said tungsten carbide particles is in the range between 30 wt. % and 65 wt. % and wherein the Ni-based alloy is a Nickel-Chromium-Molybdenum alloy comprising: (in wt. %):Cr11.0.-30.0 Mo5.0-25.0 Fe 0-10.0B0-5.0Co 0-2.5.

Various aspects include a composite turbomachine component and related methods. In some cases, a method includes: identifying a location of potential or actual structural weakness in a body of a turbomachine component, the body including a first material having a first thermal expansion coefficient; forming a slot in the location of the body, the slot extending at least partially through a wall of the turbomachine component; and bonding an insert to the body at the slot to form a composite component, the insert including a second material having a second thermal expansion coefficient differing from the first thermal expansion coefficient by up to approximately ten percent, the second material consisting of a nickel-chromium-molybdenum alloy, wherein after the bonding the insert is configured to reduce the potential or actual structural weakness in the body.

The invention relates to a compound die used for a double-slot-hole workpiece. The compound die comprises an upper die base and a lower die base which are installed oppositely, two punches are arranged at the bottom of the upper die base in a spaced mode, a concave die is arranged on the lower die base, two through holes are formed in the positions, under the two punches, of the concave die, and the two punches and guide sleeves are fixed to the upper die base through epoxy resin; each punch comprises a guide part and a working part, wherein the guide part is arranged below the working part, the guide part is a conical part, and an alloy ring is arranged on the periphery of the working front end face of the working part and made of a low-nickel-chromium-molybdenum alloy. Double holes are formed through once punching, the production efficiency is improved, the center distance between the two holes is ensured, and the machining quality of the workpiece is ensured; the guide sleeves and the two punches are fixed through the epoxy resin, machining of the die is greatly simplified, and the manufacturing cost of the die is reduced; due to the structural design of the punches, the punching service life of the punches is prolonged, and the accuracy and the quality of the punched holes are improved.

In a method for making a wrought nickel-chromium-molybdenum alloy having homogeneous, two-phase microstructures the alloy in ingot form is subjected to a homogenization treatment at a temperature between 2025° F. and 2100° F. , and then hot worked at start temperature between 2025° F. and 2100° F. The alloy preferably contains 18.47 to 20.78 wt. % chromium, 19.24 to 20.87 wt. % molybdenum, 0.08 to 0.62 wt. % aluminum, less than 0.76 wt. % manganese, less than 2.10 wt. % iron, less than 0.56 wt. % copper, less than 0.14 wt. % silicon, up to 0.17 wt. % titanium, less than 0.013 wt. % carbon, and the balance nickel.

The invention relates to a nickel-based welding electrode which comprises the following component by weight percent (wt%): 50.0-68.0% of Ni, 18.0-23.0% of Cr, 6.0-11.0% of Mo, 3.0-6.0% of Nb, 2.50-9.00% of Fe, 0.01-0.1% of C, 0.10-1.00% of Mn, 0.010-0.10% of Si, 0.015% of S or less, 0.015% of P or less, 0.01-0.10% of Cu, 0.003-0.010% of Co and the balance of impurities. The coat of the nickel-based welding electrode comprises the following components by weight percent of the welding core: 12-18% of marble, 10-15% of fluorite, 12-18% of barium carbonate, 5.0-6.4% of rutile, 3.5-5.0% of ferroniobium, 3.3-4.5 of chromium metal powder, 0.45-0.65% of sodium carbonate, 0.45-0.65% of electrolytic manganese and 1.3-1.8% of zircon sand, and the adhesion agent is 10-20% of the total weight of the power. The nickel-based welding electrode is prepared by mixing, wrapping mixture on the welding core and baking at low and high temperature. The nickel-based welding electrode disclosed by the invention is used for nickel-chromium-molybdenum alloy steel welding, ensures that the excellent mechanical properties, the excellent corrosion resistance, the excellent thermal crack resistance and the hightensile strength of the welding seam match with those of the base material, has good welding process performance, guarantees attractive molding and can be used for the welding of the steel (with 9% of Ni) working at low temperature.

A new hydrogen fluoride rotary furnace reaction cylinder is provided, which has a corrosion-resistant inner cylinder, the corrosion-resistant inner cylinder is a corrosion-resistant nickel-based alloy inner cylinder, and the diameter of the corrosion-resistant nickel-based alloy inner cylinder is 350- 550mm, the length is 4000-6300mm, and the wall thickness is 6.5-10mm. The grade of the corrosion-resistant nickel-based alloy inner cylinder is NS331 nickel-chromium-molybdenum alloy. The invention solves the technical problems of poor material stability, insufficient optimization of size and structure, and poor corrosion resistance of the hydrogen fluoride rotary furnace reaction cylinder in the prior art, and the service life is as long as 1-2 years.

The invention discloses a manufacturing process and equipment for a nickel-chromium-molybdenum alloy cast iron composite roller in a forged steel roller neck. The nickel-chromium-molybdenum alloy cast iron composite roller is composed of, by mass, 3.3-3.8% of C, 0.6-1.2% of Si, 0.4-1.2% of Mn, 0.6-1.2% of Cr, 0.3-1.0% of Mo, 2.0-3.0% of Ni, 0.6-1.1% of Cu, 0-0.05% of P, 0-0.03% of S, 0.04-0.06% of Mg, 1.5-2.5% of Ba, 1-2% of Ca, 1.0-2.0% of RE and the balance Fe. Rare earth globularization and Ba, Ca and silicon iron composite inoculation are adopted, and the mechanical properties of the roller are improved; the strength of the roller is improved by the adoption of the forged steel roller neck; in-mold integral heating and casting are conducted on a core rod through a sensing heater, forming is conducted through a combined water-cooling crystallizer, a lifting device lifts a heater upwards at a certain speed to form local directional freezing, the interface of a composite layer can be controlled dynamically, the process is simple, the efficiency is high, the electric losses are small, the cost is low, composition segregation of the composite layer is avoided, and the service life of the roller is long.

The invention relates to the field of key material parts of hydrogen energy equipment, in particular to a preparation method of a fatigue-resistant and hydrogen embrittlement-resistant plate for a high-pressure hydrogen compressor diaphragm. Based on a nickel-chromium-molybdenum alloy system, the high strength, fatigue resistance and hydrogen embrittlement resistance of the plate are guaranteed through solid solution strengthening and grain boundary regulation and control of chromium, molybdenum and niobium; the plate is prepared through the method of vacuum induction melting, steel mold casting, electroslag remelting, forging, hot rolling, cold rolling, solution treatment, small-deformation cold rolling and annealing heat treatment, the width of the plate is not smaller than 800mm, the thickness ranges from 0.4mm to 0.6mm, the length of the plate is not smaller than 1000mm, the surface roughness Ra of the plate is smaller than or equal to 0.4 micrometer, the unevenness is not larger than 10mm / m, the thickness precision is + / -0.05mm, the room-temperature yield strength and the 250DEG C yield strength of the plate respectively reach 425MPa and 350MPa or above, the room-temperature fatigue limit of the plate can reach 250MPa or above, and meanwhile, the plate has good plasticity and hydrogen embrittlement resistance, and can be used for preparing high-pressure (45MPa or above level) hydrogen diaphragm compressor diaphragm close to the hydrogen side.

The invention relates to a preparation method for a TiN steel-bonded hard alloy based on nickel chromium molybdenum alloy cast iron. The preparation method is characterized in that in-situ synthesis TiN powder is prepared, wherein one or three of Ti02 powder or TiH2 powder or Ti powder and urea ((NH2)2CO) are prepared into the in-situ synthesis TiN powder according to the N / Ti atomic ratio of 0.4-1.1; and molybdenum iron powder, vanadium iron powder, chrome iron powder, ferromanganese powder, ferrosilicon powder, iron powder, nickel powder, colloidal graphite and rare earth raw materials are prepared according to the required proportion of the mass ratio of bonding phase chemical compositions and put into a steel ball to be ball-milled, anhydrous ethanol as a medium and PVA are added, slurry obtained after ball-milling is dried, pressed, formed and sintered, and the TiN steel-bonded hard alloy is obtained. According to the preparation method, a in-situ reaction synthesis technology is combined with a liquid phase sintering technology, the size of reinforced particles is wee, the surface is free of sharp tips, the base body interface bonding is good, and the interface is clean. By the adoption of the preparation method for the TiN steel-bonded hard alloy based on the nickel chromium molybdenum alloy cast iron, the comprehensive mechanical performance of the alloy can be improved, the cost is low, and the process is easy and convenient.

The invention relates to an abrasion resistant centrifugal pump vane wheel. The abrasion resistant centrifugal pump vane wheel comprises blades, a wheel disk, a front cover plate and a rear cover plate, wherein the blades are arranged on the periphery of the wheel disk in a sleeving manner; the root of the front cover plate and the root of the rear cover plate are fixedly mounted on the wheel disk; the plate surfaces of the front cover plate and the rear cover plate are respectively arranged at the middle parts of the two sides of the blades in a covering manner; the front cover plate and therear cover plate can be used as reinforcing plates of the blades; the wheel disk, the front cover plate and the rear cover plate are manufactured by wear resistant alloy materials; and the blades aremanufactured from nickel-chromium-molybdenum alloy cast iron materials. The centrifugal pump vane wheel disclosed by the invention is simple and reasonable in structure, easy to manufacture, stable towork, and long in service life, and has excellent wear resistance.

In a method for making a wrought nickel-chromium-molybdenum alloy having homogeneous, two-phase microstructures the alloy in ingot form is subjected to a homogenization treatment at a temperature between 2025° F. and 2100° F., and then hot worked at start temperature between 2025° F. and 2100° F. The alloy preferably contains 18.47 to 20.78 wt. % chromium, 19.24 to 20.87 wt. % molybdenum, 0.08 to 0.62 wt. % aluminum, less than 0.76 wt. % manganese, less than 2.10 wt. % iron, less than 0.56 wt. % copper, less than 0.14 wt. % silicon, up to 0.17 wt. % titanium, less than 0.013 wt. % carbon, and the balance nickel.

The invention belongs to the technical field of machining of a centrifugal pump overflowing part and particularly relates to a surface isolating layer of an abrasion-resistant centrifugal pump overflowing part. The material of the overflowing part is anti-abrasion white cast iron. The isolating layer comprises a transition layer on the surface of the overflowing part and an abrasion-resistant layer outside the transition layer; the transition layer is made from boron, silicon, titanium and a nickel-chromium-molybdenum alloy; and the abrasion-resistant layer is a hot melting plastic layer. Compared with the prior art, the surface isolating layer of the abrasion-resistant centrifugal pump overflowing part has the following beneficial effects that by arranging the transition layer and the abrasion-resistant layer outside the overflowing part, the anti-corrosion performance of a pump is remarkably improved, the combining strength between the abrasion-resistant layer and a matrix can be improved by the transition layer, the hot melting plastic layer is arranged outside the transition layer, the formability and the leveling performance of the abrasion-resistant layer are improved, faults are not prone to occurrence in use, the work efficiency of the pump can be improved, the production process is controllable, and the service life of the overflowing part can be prolonged.

The invention discloses a tail cylinder sealing piece. The tail cylinder sealing piece comprises an inner ring and an outer ring; the inner ring includes an inner ring body, a first brush module and a first welding plate; the first brush module includes a first fixed plate, a second fixed plate and a first brush sealing wire; the outer ring includes an outer ring body, a second brush module and a second welding plate; the second brush module includes a third fixed plate, a fourth fixed plate and a second brush sealing wire; the inner ring and the outer ring are forgings; and the inner ring body, the outer ring body, the first fixed plate, the second fixed plate, the third fixed plate, the fourth fixed plate, the first welding plate and the second welding plate adopt materials of nickel-chromium-molybdenum alloys of cobalt and tungsten. The tail cylinder sealing piece adopts a forging machine manufacturing technology, guarantees the product size consistency and assembly precision, enhances the product structural strength, increases the wire arranging density, effectively seals high-temperature gas at an outlet part of a gas turbine tail cylinder, and adopts a chamfering angle of an exhaust hole as an obtuse angle to prevent cracking of the exhaust hole.

The invention provides various aspects including a composite turbomachine component and related methods. In some cases, a method includes: identifying a location of potential or actual structural weakness in a body of a turbomachine component, the body including a first material having a first thermal expansion coefficient; forming a slot in the location of the body, the slot extending at least partially through a wall of the turbomachine component; and bonding an insert to the body at the slot to form a composite component, the insert including a second material having a second thermal expansion coefficient differing from the first thermal expansion coefficient by up to approximately ten percent, the second material consisting of a nickel-chromium-molybdenum alloy, wherein after the bonding the insert is configured to reduce the potential or actual structural weakness in the body.

The invention relates to the field of key material parts of hydrogen energy equipment, in particular to a high-strength hydrogen embrittlement-resistant diaphragm with the mark of MP-5 and a preparation method. Based on a nickel-chromium-molybdenum alloy system, the strength and hydrogen embrittlement resistance of the diaphragm are ensured by utilizing niobium element solid solution strengthening and grain boundary regulation and control; the diaphragm is prepared through the method of vacuum or non-vacuum induction melting, steel mold casting, electroslag remelting, forging, hot rolling, cold rolling, solution treatment, small-deformation cold rolling, cutting, machining and sizing, finished product heat treatment and diaphragm surface treatment, the thickness of the diaphragm is 0.4-0.6 mm, the diameter is not smaller than 200 mm, the surface roughness Ra does not exceed 0.4 micrometer, the flatness is not larger than 0.06 mm, and the thickness of the diaphragm is not larger than 0.2 mm. The yield strength at the room temperature and the yield strength at the temperature of 250 DEG C can reach 400 MPa or above and 350 MPa or above respectively, meanwhile, good plasticity, hydrogen embrittlement resistance and fatigue resistance are achieved, and the diaphragm can be used as a hydrogen facing side diaphragm in a hydrogen diaphragm compressor with the pressure level of 45 MPa or above, especially 90 MPa or higher.

The invention discloses a high nickel chromium molybdenum alloy cast iron-based WC50 steel bond hard alloy guide roller and a preparation method thereof. The high nickel chromium molybdenum alloy cast iron-based WC50 steel bond hard alloy comprising, by mass, 2.9-3.5% of C, 1.2-2.7% of Cr, 0.3-0.7% of Mo, 0.8-2.0% of Ni, 0.3-0.6% of V, 1.0-1.8% of Si, 0.5-1.0% of Mn, less than or equal to 0.02% of S, less than or equal to 0.02% of P, 0.2-0.5% of Ce, 50% of WC, and the balance Fe is adopted. The alloy is forged, annealed, machined, thermally treated, grinded, and tested, and finally the guide roller is manufactured. The prepared steel bond hard alloy guide roller has excellent physical and mechanical properties of high hardness, wear resistance, high-temperature oxidation resistance, heat shock resistance and the like, the service life of the guide roller, the production efficiency of steel rollings and the production equality are improved, the production cost is low, and the cost performance is extremely high. The guide roller has great economic benefits and social benefits.

The invention relates to the technical field of nickel-based high-temperature alloy strengthening, in particular to a method for improving the performance of a Hastelloy c-276 nickel-chromium-molybdenum alloy laser cladding layer. In order to solve the problem of hardness improvement, nano chromium carbide, nano tungsten carbide, nano yttrium oxide and nano boron carbide particles with high hardness are adopted as strengthening phases, and meanwhile, the performance of the cladding layer is further improved by utilizing the small-size effect of the nano particles; meanwhile, in order to solve the problems that the nano-particles are easy to suspend and the number of particles actually entering a cladding layer in the cladding process is small, a high-energy ball milling method is adopted to enable the nano-powder and the Hastelloy c-276 powder to be combined in a mechanical alloying mode; and for part of base materials, a laser cladding process can be regulated and controlled after preheating, cracking of the cladding layer is inhibited, and a workpiece is recovered to the design size through a precision machining method after welding. According to the method, the reinforced nickel-chromium-molybdenum cladding layer which is high in hardness and inhibits crack generation is successfully prepared, and an efficient and reliable novel technological method is provided for improving wear resistance and impact resistance of the surface of a part.

The invention discloses a nickel-chromium-molybdenum alloy cast iron composite roll process and equipment in a forged steel roll neck. The material mass percentages are: C: 3.3-3.8%, Si: 0.6-1.2%, Mn: 0.4-1.2%, Cr: 0.6 ~1.2%, Mo: 0.3~1.0%, Ni: 2.0~3.0%, Cu: 0.6~1.1%, P: ≤0.05%, S: ≤0.03%, Mg: 0.04~0.06%, Ba: 1.5~ 2.5%, Ca: 1-2%, RE1.0-2.0%, and the balance is Fe; Rare earth spheroidization and Ba, Ca, and ferrosilicon compound inoculation are used to improve the mechanical properties of the roll, and the forged steel roll neck is used to improve the roll quality. Intensity, using induction heater to heat and cast the mandrel as a whole in the mold, combined water-cooled crystallizer to form, the lifting device lifts the heater up at a certain speed to form a directional solidification in the area, and can dynamically control the interface of the composite layer, the process is simple and the efficiency is high , low power consumption, low cost, no component segregation in the composite layer, and long service life of the roll.

The invention provides a preparation method of a selective laser melting TC4 alloy-based composite material, which comprises the following steps: carrying out corrosion treatment on a selective laser melting TC4 alloy by adopting an acid solution to obtain a surface corrosion alloy; and film coating treatment is conducted on the surface of the surface corrosion alloy, and the selective laser melting TC4 alloy-based composite material with the nickel-chromium-molybdenum alloy coating on the surface is obtained. The selective laser melting TC4 alloy is subjected to corrosion treatment firstly, inclusions and a stress layer on the surface of the selective laser melting TC4 alloy can be removed, then surface coating treatment is carried out, the selective laser melting TC4 alloy-based composite material with the nickel-chromium-molybdenum alloy coating on the surface is obtained, nickel and chromium elements in the alloy coating have large affinity to oxygen, and therefore the surface of the selective laser melting TC4 alloy-based composite material is not prone to oxidation. The property of an endogenous oxidation film is remarkably improved, and chemical bonding of TC4 alloy and ceramic is promoted; and the molybdenum element is used as a surfactant, so that the surface quality of the plating layer is improved, and the physical and chemical binding force of the TC4 alloy and the ceramic is further improved.