143results about How to "Play a role in solid solution strengthening" patented technology

The invention relates to a method for repairing an abraded hot roll through submerged arc bead welding and laser cladding and belongs to the technical field of surface treatment. The method comprises the following technological steps that firstly, the abraded surface of the abraded hot roll is machined through a lathe to remove surface cracks and a fatigue layer; secondly, a high-toughness transition layer is arranged on the roll surface through bead welding, and the hot roll repaired through bead welding is subjected to heat treatment and machined to be 1.2-1.6 mm smaller than a finished product in diameter; thirdly, a high-temperature abrasion resisting working layer with the thickness of 0.7-1.0 mm is arranged on the surface, obtained through bead welding, of the roll in a laser cladding manner through a laser cladding synchronous powder feeding method; and finally, finish machining is carried out until the regulated dimension and precision are achieved. According to the method, the bead welding technology and laser cladding technology are organically combined; and compared with previous production technologies and methods, the production cost is reduced, the repair risk of the roll is small, and the service life of the repaired roll is long.

The invention relates to a copper base alloy and a preparation method for the copper base alloy. Chemical compositions and weight percentage of the copper base alloy are that: nickel: 14.0 to 30.0 percent; manganese: 14.0 to 30.0 percent; ferrum: 1.0 to 8.0 percent; the residual is copper; moreover, aluminum: less than 0.002 percent; plumbum: less than 0.002 percent; antimony: less than 0.002 percent; bismuth: less than 0.002 percent; phosphorus: less than 0.01 percent; the residual composition is copper. The copper base alloy with high performance is prepared after smelting and thermo-mechanical treatment, microstructure of the alloy can be controlled to be nearly equiaxial crystal particles with the diameter of 50 micrometers. The alloy has ageing strengthening effect. When the alloy is stretched under room temperature by ageing after cold deformation, the breaking strength sigma b reaches 1480 MPa at maximum; the extensibility delta 5 reaches 6 percent at maximum; the Vickers hardness Hv reaches 470 at maximum. When the alloy is stretched under high temperature of 400 DEG C, the breaking strength sigma b reaches 1100MPa at maximum, and the extensibility delta 5 reaches 6 percent at maximum.

The invention belongs to the field of magnesium alloy design. An Mg-Sn-Al ternary alloy belongs to a novel wrought magnesium alloy and consists of the following raw materials in percentage by mass: 4.00-10.00% of industrial pure tin, 1.00-6.00% of industrial pure aluminum, and the balance of industrial pure magnesium and unavoidable impurities. A preparation method of the wrought magnesium alloy comprises the steps of firstly melting magnesium and aluminum, then adding tin and a microalloying element, namely manganese or zinc, pouring to form cast ingots after stirring and refining, carrying out homogenizing treatment on the cast ingots, and extruding the cast ingots to obtain corresponding extruded sections. The wrought magnesium alloy and the preparation method are characterized in that the novel wrought magnesium alloy with relatively good strength and toughness is prepared from the raw materials, namely the aluminum and the tin, which are both relatively low in cost and melting point, and the strength and the toughness are equivalent to a commercial high-strength magnesium alloy ZK60.

The invention provides a preparation method of an in-situ synthesis low-pressure cold spraying CuNiCoFeCrAl2.8 high-entropy alloy coating. The method comprises the following steps that Cu powder, Ni powder, Co powder, Fe powder, Cr powder and Al powder are uniformly mixed to obtain powder for cold spraying, and then low-pressure cold spraying is carried out on the surface of a metal matrix so as to obtain a mixed powder coating, and then induction remelting in-situ synthesis is carried out to obtain the CuNiCoFeCrAl2.8 high-entropy alloy coating. According to the method, the low-pressure coldspraying technology is used, the cold spraying powder is subjected to low-pressure cold spraying on the matrix, the induction remelting in-situ synthesis is carried out, the CuNiCoFeCrAl2.8 high-entropy alloy coating is obtained, an alloying reaction is sufficient, the microstructure of a mixed powder coating forms a high-entropy alloy structure with a body-centered cubic structure from a pure metal in situ, the high-entropy alloy coating is formed, the structure is compact, the porosity is low, the high-entropy alloy structure is stable in structure, few in impurities, excellent in mechanicalperformance, high in strength and high in hardness, and good in wear resistance and corrosion resistance; and the thickness of the CuNiCoFeCrAl2.8 high-entropy alloy coating is 100 microns-3 millimeter, the preparation equipment is simple, and the process is convenient.

The invention provides a heated and reinforced high-strength cast magnesium alloy and a preparation method thereof. The alloy comprises the following components in percentage by weight: 8.0-10.0 of Zn, 1.0-5.0 of Al, 1.0-5.0 of Sn, 0.1-1.0 of Cu, 0.3-0.8 of Mn, 0.3-0.5 of Ca, and the balance of Mg and inevitable impurity elements. According to the high-strength cast magnesium alloy, under a room-temperature stretch test, the tensile strength reaches 320-350 MPa, and the yield strength reaches 220-260 MPa. A heat treatment process of the magnesium alloy comprises solution treatment by 4-8 hours at a temperature of 330-380 DEG C, air cooling, aging by 8-16 hours at a temperature of 150-220 DEG C and obtaining of the high-strength cast magnesium alloy. The heat treatment process of the alloy is simple and easy to realize; and the aging treatment can form a lot of nanoscale strengthening phases in an alloy structure, so that the alloy strength can be prominently improved. The alloy contains no such noble metal as rare earth, and is an alloy system with low cost and wide applicability.

The invention discloses anti-bacterial dual-phase stainless steel, and belongs to the technical field of dual-phase stainless steel. The stainless steel comprises C, Si, Mn, S, P, Cr, Mo, W, B, Cu, Ag, Nb, N, Ba, Fe and lanthanum cerium mixed rare earth. The invention further discloses a machining process of the anti-bacterial dual-phase stainless steel. The steel has the beneficial effects of being free of nickel, low in production cost, and good in anti-bacterial performance. The colon bacillus and staphylococcus sterilizing rate reaches 99.9%, and the steel can be widely used for the fieldof pharmacy, health care instruments, food processing industry and catering utensils, freezing devices, and sewage treatment and purification devices.

The invention relates to a method for preparing nanoscale spherical Si-phase Al-Si alloy through selective laser melting. The method comprises the steps that a CAD three-dimensional model for forming parts is designed, and is converted into a data format STL file capable of being slit, a supporting body of a certain height is built at the bottom of the three-dimensional model, the three-dimensional model and the supporting body are slit into a plurality of layers, technological parameter setting is carried out, and data and parameters are guided into SLM equipment; a sealing device is filled with inert gas for atmosphere protection after being vacuumized, a base plate is fixed to a work table capable of ascending and descending, a layer of Al-Si alloy powder is evenly laid on the base plate through a powder feeding system, corresponding cutting layers are selectively scanned according to guided-in parameter lasers, the base plate is lowered by the thickness of one layer, and a layer of new Al-Si alloy powder is evenly laid on the base plate until scanning of all the layers is finished. In the method, no mold is needed, the utilization rate of materials is high, the mechanical property of the Al-Si alloy can be improved, and the production cost of parts in a complex shape can be lowered.

The invention discloses a nickel-aluminum-chromium-molybdenum-iron eutectic alloy, wherein the composition is according to the atom percentage of NiAl-28Cr-6Mo-xFe, the atomic ratio of Ni to Al is 1:1, and x is more than 0 and is less than or equal to 10 at%. The invention further discloses a preparation method of the nickel-aluminum-chromium-molybdenum-iron eutectic alloy, wherein the preparationmethod specifically comprises: 1, weighing the raw materials according to the atomic percentage ratio of the components of the alloy; 2, carrying out pre-treatment on the weighed raw materials; 3, calculating the compensation amounts of Al and Cr, and weighing the corresponding raw materials; 4, smelting to prepare the nickel-aluminum-chromium-molybdenum-iron eutectic alloy. According to the present invention, the components of the nickel-aluminum-chromium-molybdenum-iron eutectic alloy are determined, and the prepared nickel-aluminum-chromium-molybdenum-iron eutectic alloy has the significantly improved mechanical property, significantly improved room temperature fracture toughness and the significantly improved ductility.

The invention relates to a low-cost high-compression-strength wrought magnesium alloy and a preparation method thereof. The magnesium alloy material is composed of six elements, namely Mg, Zn, Mn, Sn,Ca and Cu, wherein the content of the Zn element is 4.0%-8.5%, the content of the Mn element is 0.1%-0.4%, the content of the Sn element is 0.1%-0.4%, the content of the Ca element is 0.1%-0.4%, thecontent of the Cu element is 0.1%-0.4%, the content of inevitable impurities is less than or equal to 0.15%, and the balance is the Mg; and compared with a traditional commercial grade magnesium alloymaterial, high compressive yield strength can be obtained after the magnesium alloy material is subjected to a conventional extrusion treatment, and the compressive yield strength of the alloy is obviously higher than tensile yield strength. The magnesium alloy material does not contain precious alloy elements, and is simple in preparation process and low in cost, has very important practical value for manufacturing a pressed magnesium alloy component.

The invention discloses a preparation method for a metal-doped modified turbine blade laser cladding surface coating layer. The preparation method comprises the following steps of performing cleaningpretreatment on a 17-4PH stainless steel blade matrix material; doping Mo powder into 17-4PH powder, performing full and uniform mixing in a ball mill, performing heating and drying in a drying furnace, and taking the dried powder as laser cladding composite powder for standby; under the argon condition, adopting a laser cladding process to enable the laser cladding composite powder to clad on thepretreated 17-4PH stainless steel blade matrix; and performing microscopic structure analysis and performance detection on a coating layer. The coating layer is high in hardness, excellent in corrosion resistance and good in structural stability; and through metallurgical bonding with the matrix, the coating layer is reasonable in cost and can better meet the service requirements of turbine powermechanical engineering.

The invention discloses a high-reaming hot-rolled acid-pickling steel plate above a 500-MPa level and a manufacturing method thereof. The chemical components of steel comprises, by weight, 0.02%-0.07%of carbon, 0.01%-0.06% of silicon, 1.20%-1.40% of manganese, 0.030%-0.050% of aluminum, 0.010%-0.017% of niobium, 0.20%-0.40% of molybdenum, 0.010% of phosphorus, 0.005% of sulphur and the balance iron and inevitable impurities. The manufacturing method comprises the steps that continuously-cast billets with the thickness being 100-230 mm are heated to the temperature between 1160 DEG C and 1200DEG C, and heat preservation is conducted for 3 to 4 hours; the temperature of rough rolling is equal to or lower than 1060 DEG C, the thickness of intermediate billets is between 35mm and 50mm, and the precision rolling finishing rolling temperature is between 820 DEG C and 900 DEG C; forepart rapid continuous laminar cooling is adopted after finishing rolling, the cooling rate is 30-50 DEG C persecond; the coiling temperature is between 500 DEG C and 600 DEG C; and hydrochloric acid is adopted so that through-coiling continuous cleaning can be conducted on steel plate oxide scale, and the range of the pulling-rectifying elongation rate is between 0.5% and 1.5%. The high-reaming hot-rolled acid-pickling steel plate above the 500-MPa level has high-strength and high-reaming properties.

The invention relates to a deformation zinc alloy, as well as a preparation method and a use thereof. The deformation zinc alloy comprises 2.0-9.5% of Cu, 0.01-0.5% of Mn, 0-0.1% of Co and the balance of zinc and inevitable impurity elements, wherein the total amount of the inevitable impurity elements is less than 0.01. The microstructure of the zinc alloy mainly comprises a zinc matrix primary phase and intermetallic compounds dispersed in the primary phase, wherein the primary phase is of an HCP (hexagonal close-packed) structure, and the intermetallic compounds are of small Zn4Cu and Zn9Mn; the volume content of the Zn4Cu phase is 5%-55%, the volume content of the Zn9Mn phase is 0.1%-5%, and the balance is of the primary phase; and the average grain size of the primary phase is 15-35 mu m, and the average grain size of the intermetallic compounds is 5-15 mu m. The alloy can be produced into screw nuts and screw caps for air conditioners for replacing traditional brass and further solving the problem of being short of brass resources through post-processing technologies, such as melting-casting, extrusion, drawing and the like under certain process conditions.

The invention discloses a medical suture material and a preparation method. The medical suture material comprises components in parts by weight as follows: 110-140 parts of magnesium, 1-2 parts of zinc, 0.1-0.4 parts of aluminum, 3-5 parts of molybdenum, 2-2.5 parts of calcium, 0.1 parts of carbon, 4-6 parts of niobium, 0.5-1 part of iron, 1-2 parts of manganese, 0.5-1 part of germanium, 1-2 parts of zirconium and 0.05-0.1 parts of titanium. The medical suture material has very high strength and elongation at break, is easily degradable and has good corrosion resistance and biocompatibility.

The invention provides a high-strength titanium alloy and a preparation method thereof. The high-strength titanium alloy comprises, by mass, 4.5%-5.5% of Al, 3.5%-4.5% of Mo, 3.5%-4.5% of Cr, 1.5%-2.5% of Sn, 10%-50% of Zr and the balance Ti. According to the high-strength titanium alloy and the preparation method thereof, the content of all the elements is strictly controlled, and the mechanicalproperty of the titanium alloy is improved; the Cr element is added, therefore, a beta phase is stabilized, and the room-temperature strength of a titanium alloy matrix can be significantly improved;the Al element greatly improves the stability of an alpha phase and increases the beta-alpha conversion temperature, the uniform and fine alpha phase can be conveniently obtained after quenching in the solution treatment process, and the specific strength of the titanium alloy can be significantly improved; and in addition, lattice distortion can be caused due to addition of the Zr element, the defects can cause nucleation point increasing and nucleation density increasing in the nucleation process, the grain refinement effect is achieved, and then fine crystal strengthening is achieved.

The invention discloses a rare earth magnesium alloy cast ingot heat treatment technology. A magnesium alloy comprises, by mass percent, 8.50%-9.50% of Gd, 3.0%-4.0% of Y, 0.5%-1.0% of Nd, 0.5%-1.0% of Ce, 0.40%-0.60% of Zr and the balance Mg and non-removable impurity elements. The rare earth magnesium alloy cast ingot heat treatment technology comprises the following steps that firstly, a heat treatment furnace is preheated to 200 DEG C-250 DEG C; secondly, after a magnesium alloy blank is cast and formed, rapid cooling is conducted to 100 DEG C-250 DEG C in a cold water spraying manner; thirdly, heat preservation of the heat treatment furnace is conducted for 4-16 h at the temperature ranging from 200 DEG C to 250 DEG C; fourthly, the furnace temperature of the heat treatment furnace isincreased to 300 DEG C-400 DEG C with the temperature rise speed of 150-250 DEG C/h, and heat preservation is conducted for 2-4 h; and fifthly, the furnace temperature of the heat treatment furnace is increased to 500 DEG C-510 DEG C with the temperature rise speed of 150-250 DEG C/h, and heat preservation is conducted for 8-24 h, and then furnace cooling is conducted to the room temperature. Through mutual cooperation of the selected proper heat treatment temperature, the selected proper heat preservation time and the cooling manner technology for the rear earth magnesium alloy, magnesium alloy grains can be effectively refined, the room-temperature tensile strength of the finally-obtained blank is larger than or equal to 270 MPa, the yield strength is larger than or equal to 150 MPa, and elongation rate is larger than or equal to 5%.

The invention relates to a high-entropy ceramic modified coating with controllable components and a controllable microstructure, and a preparation method thereof. The high-entropy ceramic modified coating is a mixed coating formed by any four or more elements selected from zirconium (Zr), titanium (Ti), hafnium (Hf), tantalum (Ta), niobium (Nb), vanadium (V), chromium (Cr), molybdenum (Mo) or tungsten (W) and a substrate coating. The substrate coating comprises SiC-Si, ZrC-ZrSi2 or TiC-Ti. The preparation method comprises the following steps: pre-treating a base material; and mixing a solvent and a binder, carrying out ultrasonic dispersion, then adding a corresponding high-entropy ceramic precursor raw material TMxOy and other raw materials to prepare a uniform slurry suspension solution, and carrying out dipping-drying curing to obtain a pre-coating layer. According to the method, the high-entropy ceramic does not need to be prepared in advance, only the corresponding precursor raw materials are used for coating the surface of the base material through a simple material coating method, and a (carbon, nitrogen, carbon nitrogen or boron) compound high-entropy ceramic solid solution is generated in situ in a infiltration process, so solid solution strengthening effect can be achieved, the cohesion binding force of the coating is high, the hardness and high-temperature oxidation corrosion resistance of the coating can be further improved, and large-scale industrial application can be achieved.

The invention belongs to the technical field of flux-cored wires, and particularly relates to an anti-wear flux-cored wire, as well as a preparation method and application thereof. The anti-wear flux-cored wire comprises a skin and a flux core; and the flux core comprises the following raw materials: 9-55wt% of molybdenum powder, 5-30 wt% of chromium powder, 1-15 wt% of nickel powder, 0.5-3 wt% ofcopper powder, 0.3-1.2 wt% of carbon powder, 0.5-4 wt% of ferroboron alloy powder, 0.5-3 wt% of titanium carbide powder, 1-5 wt% of FeNb alloy powder, 0.1-2 wt% of rare earth oxide, 0.3-1.0 wt% of silicon containing whiskers, and the balance of iron powder. The anti-wear flux-cored wire is used as an arc electrode material to be sprayed, and a coating of which the hardness is larger than or equalto 820 (HV) can be obtained.

The invention discloses a preparation method for a medical false tooth. According to the preparation method for the medical false tooth, the alloy material comprises the following components of 0.6% of Nb, 7% of Fe, 6.5% of Mo, 0.7% of Mn, 12% of Zr, 0.65% of Ge, 3.5% of Ga, 3% of Cr, 2% of Ca, 1.4% of In, 0.03% of C and the balance Ti. According to the preparation method for the medical false tooth, element powder or alloy powder of all elements with appropriate particle sizes is adopted, after the element powder or the alloy powder is mixed, the element powder or the alloy powder is sintered through injection molding, and accordingly the medical false tooth is obtained; the strength of the manufactured medical false tooth is much larger than that of a medical pure titanium material, the medical false tooth is friendly to the oral environment and low in density, and has good smelting and sintering machining properties; the mechanical properties of the medical false tooth are close to those of a real tooth, and the anti-fatigue property and the anti-corrosion property are good.

The invention discloses a rare earth magnesium alloy and a preparation method thereof. The rare earth magnesium alloy contains the following components in percentage by mass: 8.4-8.7% of Al, 0.85-0.89% of Zn, 0.28-0.30% of Mn, 0.39-1.21% of Nd, 0.41-0.43% of Er, less than 0.04% of impurity elements (Si, Fe and Cu) in total, and the balance of Mg. According to the method, rare earth elements Nd and Er are compounded and added in a magnesium alloy by smelting so as to modify the magnesium alloy and the obtained casting-state rare earth magnesium alloy is subjected to T6 heat treatment. Compared with the prior art, the rare earth magnesium alloy prepared by the method is relatively high in room-temperature tensile strength and high-temperature tensile strength and the plasticity is enhanced greatly.

The invention discloses bearing steel and a preparation method thereof, and belong to the technical field of steel. The bearing steel comprises the following components in percentage by weight: 0.52-0.58% of C, 0.15-0.35% of Si, 0.75-0.90% of Mn, 0.025% or less of P, 0.015% or less of S, 0.20% or less of Ni, 0.10-0.20% of Cr, 0.10% or less of Mo, 0.20% or less of Cu, 0.050% or less of Al, 0.0030% or less of Ti, 0.04-0.10% of V, 0.004-0.011% of N, 0.0012% or less of O, and the balance Fe and inevitable impurities. The preparation method of the bearing steel sequentially comprises the steps of converter smelting, refining, RH vacuum degassing, continuous casting and heating rolling. According to the bearing steel, the non-metallic inclusion content is low, and meanwhile mechanical properties and surface quality are good.