41results about How to "Less metallurgical defects" patented technology

The invention discloses a special aluminum-manganese alloy powder formula for 3D printing, a preparation method and a printing method thereof, wherein the alloy powder is a pre-alloy, and in terms of mass percentage, it includes: Mn: 1.0-5.5wt%; Sc : 0.3~0.6wt%; Zr: 0.1~0.3wt%; Mg: 0.8~1.2wt%; Si: 0.2~0.25wt%; Fe: 0.2~0.25wt%, Cu: 0.1~0.2wt%; Zn: 0.1 ~0.2wt%, the rest is Al. The parts of the Al-Mn alloy composition of the present invention after laser 3D printing have no cracks, high density, corrosion resistance, high mechanical properties, and low anisotropy; it solves the problem that the traditional casting and forging Al-Mn alloy composition can be directly used in 3D printing The problem of easy cracking and low mechanical properties. After the alloy composition of the invention is 3D printed, the tensile strength is higher than that of the traditional cast and forged aluminum-manganese alloy. At the same time, compared with other mature 3D printing Al-Si alloys, the alloy of the present invention has higher corrosion resistance and mechanical properties.

The invention discloses a special Al-Cr heat-resistant alloy powder for 3D printing, a preparation method, an application and an Al-Cr heat-resistant alloy. The Al-Cr heat-resistant alloy powder is a pre-alloyed powder, which includes Cr : 3~4.5%, Mg: 0.5~1.2%, Mn: 0.3~0.5%, Sc: 0.3~0.8%, Zr: 0.1~0.4%, Si: 0.05~0.55%, and the rest is Al; the 3D printing The special Al-Cr heat-resistant alloy powder is screened and dried; after the drying process, the coaxial powder feeding 3D printing is carried out. The density of the Al-Cr heat-resistant alloy obtained by the present invention exceeds 99%, and the average hardness reaches 150HV 0.2 , The tensile strength at 200 ° C is nearly 300Mpa, the structure is fine and uniform, the density is high, the anisotropy is low, and it has excellent room temperature performance and high temperature performance.

The invention discloses a process method, in particular a process method for reducing metallurgical defects of a GH4169 nickel-based alloy ingot, and belongs to the technical field of nickel-based alloy remelting production technology. Provided is a process method for reducing metallurgical defects of GH4169 nickel-based alloy ingots with few finished product quality defects. The process method uses the GH4169 nickel-based alloy smelting ingot obtained by vacuum induction melting as the base ingot, and obtains reduction of the metallurgical defects of the GH4169 nickel-based alloy ingot through one homogenization treatment, one quick forging upsetting and one remelting.

The present invention discloses an aluminum alloy evaporator inner wall thin plate and a continuous casting rolling production process thereof. The thin plate adopts an aluminum manganese alloy as a base, contains silicon, iron, copper, manganese, magnesium, zinc and titanium, and is prepared by adopting a continuous casting rolling production process. The process comprises the following steps: adding raw materials to a smelting furnace to carry out melting, refining, and residue removing; discharging the resulting material to a cast rolling machine from the furnace to carry out cast rolling; carrying out a first annealing treatment on the cast-rolled plate material to reduce needle-like FeAl3 and influence on mechanical property by a phase composition, wherein the phase composition and the Al-Mn solid solution achieve phase equilibrium; carrying out cold rolling on the first-annealed plate material 5-6 times; carrying out a second annealing treatment on the cold-rolled plate material; and carrying out foil rolling 1-2 times to prepare the aluminum alloy evaporator inner wall thin plate. The technical scheme of the present invention has the following characteristics that: good moldability, good weldability, and good corrosion resistance are provided, structure and performances are uniform, metallurgical defects are less, anisotropy is low, strength is high strength, elasticity is good, and the like.

The invention discloses a powder metallurgy preparation method of nanophase / metal composite powder and a block material thereof. The method comprises the steps of carrying out low-speed ball milling on nanophase powder and metal powder for a long time, and uniformly dispersing nanophases on the surface or inside the flake metal powder, so as to obtain nanophase / metal flake composite powder; and carrying out high-speed ball milling for a short time to weld the nanophase / metal flake composite powder to obtain nanophase / metal granular composite powder. According to the preparation method, the problems of uniform dispersion and interface bonding of the nanophases in a metal matrix can be solved through only adjusting the speed of ball milling; compared with traditional constant-speed ball milling, the ball milling method has the advantages that dispersion of the nanophases is more uniform, the interface bonding strength is higher, and the prepared material is more excellent in performance; and the preparation method is simple and efficient in technology and applicable to batch preparation.

The invention discloses a manufacturing method, in particular discloses a manufacturing method for a GH4169 nickel-based alloy ingot with low metallurgical defects, and belongs to the technical field of nickel-based alloy remelting production technology. Provided is a method for manufacturing a GH4169 nickel-based alloy ingot with low metallurgical defects, which can significantly reduce the metallurgical defects of the GH4169 nickel-based alloy ingot. The manufacturing method uses the GH4169 nickel-based alloy ingot obtained by vacuum induction melting as the base ingot, and obtains the GH4169 nickel-based alloy ingot with low metallurgical defects through two remelting, one homogenization treatment and one rapid forging and drawing, wherein, The sequence of the homogenization treatment and the rapid forging and drawing process is arranged between two remelting processes.

The invention discloses a preparation method for high-purity titanium nickel copper shape memory alloy ingots, and relates to the technical field of shape memory alloy preparation. Raw materials are screened, cleaned and dried; the raw materials comprise sponge titanium particles, electrolytic nickel particles, high-purity copper particles and phosphorus copper intermediate alloys; after the driedraw materials are weighed, the materials are paved in a smelting furnace in sequence according to a first preset condition; the materials are smelted according to a vacuum induction smelting technology, wherein the smelting process comprises power supply, degassing, refining and casting; the aftertreatment is performed on ingots after casting according to a second preset condition by adopting a hot isostatic pressing method; and then, the flaw detection, the riser cutting and the bottom cushioning are performed on the ingots after aftertreatment in sequence to obtain high-purity titanium nickel copper ingots. The preparation method achieves the technical effects of convenience to prepare the ingots, controllable and lower content of impurity element O, high content stability of the O element, fine grain structure and great reduction of metallurgy defects.

The invention discloses a neodymium-iron-boron permanent magnet material, a preparation method and a magnetic field auxiliary direct casting device. A main magnet of the device is a circular-ring-shaped magnet which is magnetized in a radial mode. A first disc-shaped repulsion magnet with the magnetic field direction being axially upward is arranged below the center of the main magnet, and a second disc-shaped repulsion magnet which is magnetized in a radial mode is arranged on the periphery of the first repulsion magnet. A regulating magnet is arranged at the upper end of the main magnet, second soft iron is arranged on the upper portion of the regulating magnet, first soft iron is arranged outside the regulating magnet, and a circular-ring-shaped magnet guide magnet which is magnetized downwards in the axial direction is arranged outside the main magnet. The chemical general formula of the neodymium-iron-boron permanent magnet material is [Nd (85-x-y) CoxFeyAlzB (15-z)] (100-a) Ma, wherein in the formula, x+y is larger than or equal to 30 and smaller than or equal to 70, z is larger than or equal to 0 and smaller than or equal to 10, and a is smaller than and equal to 4. Compared with a material prepared without adding magnetic fields, the performance of the neodymium-iron-boron permanent magnet material is greatly improved, the preparation process is simple, cost is low, products are dense, and the neodymium-iron-boron permanent magnet material is suitable for industrial production.