6results about How to "Reduce plasticity" patented technology

This invention discloses a refractory high-entropy alloy resistant to high-temperature molten aluminum corrosion and erosion-wear, its preparation method, and its applications. The refractory high-entropy alloy of this invention comprises, by atomic percentage: 40-50 at.% Nb, 35-40 at.% Ti, 4-10 at.% Mo, 4.5-5 at.% Cr, and no more than 10 at.% Al. This invention obtains the refractory high-entropy alloy by mixing and melting the raw materials under a protective atmosphere. The refractory high-entropy alloy ingot of this invention has a single-phase BCC microstructure, exhibiting stable structure, good mechanical properties, and excellent resistance to molten aluminum corrosion and erosion-wear. The Nb-Ti-Mo-Cr based refractory high-entropy alloy resistant to molten aluminum corrosion and erosion-wear prepared using this invention can significantly improve the service life of components, reduce replacement frequency, and has high economic benefits.

The application provides a wide strip rolling method of TB, TC titanium alloy, which comprises the following steps: S1, preparing electrode blocks, and smelting the electrode blocks after group welding to obtain titanium ingots; S2, forging the titanium ingots into slabs, and rolling the slabs after surface treatment to medium-rolled plates with a thickness of 50-60 mm, and further rolling the medium-rolled plates to 5-6 mm wide strips; S3, treating the wide strips, cold-rolling the wide strips through the first pass to the third last pass to obtain cold-rolled preformed wide strips, cold-rolling the preformed wide strips through the second last pass and the last pass to obtain 1 mm wide strips, and carrying out on-line annealing on the wide strips. According to the application, the titanium alloy is smelted to ingots according to the characteristics of the titanium alloy, the scales on the surface of the ingots are removed after coiling, and the ingots are directly cold-rolled after grinding, so that the titanium alloy wide strips of TB and TC series with a thickness of less than 1.0 mm can be rolled.

The invention discloses a method for refining 316L stainless steel grains based on a selective laser melting technology, and belongs to the technical field of metal material additive manufacturing. According to the method, Fe-C-B alloy powder is added, a Fe-B or Fe-B-Cr type compound is formed to serve as a heterogeneous nucleation core when the 316L stainless steel component is manufactured through selective laser melting, columnar crystal epitaxial growth is inhibited, and grain refinement is achieved. By means of the synergistic effect formed by Fe, C and B, the negative influence of the SLM technology on the 316L stainless steel forming process is avoided, the advantages of the SLM technology are fully exerted in the 316L stainless steel component forming process, accordingly, the 316L stainless steel component high in compactness and excellent in comprehensive performance can be formed only through SLM, the method is stable in process, low in crack sensitivity and high in yield, and the production cost is reduced. The method has remarkable advantages in the field of additive manufacturing of high-performance 316L stainless steel components.

The application discloses a preparation method of a silver tin oxide electric contact material with good plasticity and arc erosion resistance, and comprises the following steps: first, taking Ag ingot, Sn ingot and X ingot of an additive element to prepare Ag-Sn alloy powder with a required particle size; the obtained powder is oxidized to obtain AgSnO2 mother powder; then, the required amounts of Ag, Sn and X elements are calculated according to the component proportion of the required preparation material, and are weighed for standby, wherein the Sn and X elements are weighed in the form of AgSnO2 mother powder, and the Ag element is weighed in the form of silver nitrate and AgSnO2 mother powder; then, an alkaline substance in excess of silver nitrate is weighed, and the alkaline substance and the silver nitrate are respectively prepared into solutions; then, the weighed AgSnO2 mother powder is added into the alkaline solution, and the silver nitrate solution is continuously added for reaction to obtain AgSnO2 powder; and finally, the obtained powder is prepared into a silver tin oxide electric contact through a conventional process. The contact prepared by adopting the method has good plasticity and arc erosion resistance.

This invention discloses high impact-resistant Ti 2 The method for preparing medium-thick AlNb alloy plates is as follows: Step 1: Using NbTi master alloy, HTi, Al alloy, and Mo65Al master alloy as raw materials, all raw materials are pressed into an electrode block and subjected to three VAR melting processes; Step 2: Ti alloy is prepared using a free forging method. 2 AlNb alloy free forging slab; Step 3: Using hot rolling method, Ti 2 AlNb alloy free-forged slabs are rolled into Ti 2 AlNb alloy medium-thick slabs are then straightened; Step 4: The straightened Ti... 2 AlNb alloy medium-thick slabs undergo double heat treatment followed by machining to obtain Ti. 2 AlNb alloy medium-thick plate finished product. This method solves the problem of existing Ti 2 AlNb alloy plates suffer from insufficient impact resistance, complex preparation processes, and poor microstructure uniformity. High-impact Ti alloys were also disclosed. 2 AlNb alloy medium-thick plate.

The invention belongs to the technical field of grinding of grinding tools, and discloses a brittle corrosion-resistant metallic bond, a metallic bond superhard grinding wheel and a preparation method of the metallic bond superhard grinding wheel. The brittle corrosion-resistant metal bonding agent prepared by the invention comprises the following raw materials in parts by weight: 50-70 parts of copper powder, 5-20 parts of tin powder, 5-15 parts of graphite powder and 15-20 parts of an improvement additive. Graphite powder and an improvement additive are added into a traditional bronze-based metal binding agent, secondary heat treatment is carried out, the plasticity of the binding agent is reduced, the brittleness and hardness of the binding agent are improved, brittle fracture can occur in time, and the workpiece quality cannot be affected; through secondary heat treatment, elements in the improvement additive form a uniform and compact protective film on the grinding wheel, internal metal can be continuously prevented from being corroded in the whole life cycle of the grinding wheel, and the thickness consistency problem caused by corrosion of the side face in the using process of the grinding wheel is solved. The brittleness and corrosion resistance of the bronze-based metal bonding agent are improved on the premise that the cost is not obviously increased.