13results about How to "Promotes dynamic recrystallization" patented technology

The invention belongs to the technical field of aluminum alloy processing, and particularly relates to a manufacturing method of a high-strength aluminum-lithium alloy plate, a non-homogenized casting blank is subjected to ultralow-temperature rolling, high-temperature rough rolling, ultralow-temperature finish rolling and aging treatment, the casting blank is made of aluminum-lithium alloy, the rolling temperature of ultralow-temperature rolling and ultralow-temperature finish rolling ranges from-196 DEG C to-100 DEG C, the temperature of high-temperature rough rolling ranges from-20 DEG C to-30 DEG C, and the temperature of high-temperature rough rolling ranges from-20 DEG C to-30 DEG C; the rolling temperature of the high-temperature rough rolling is 360-480 DEG C, and the total deformation is not less than 80%; the aluminum alloy plate is finer in crystal grain, higher in strength, better in ductility, higher in forming precision and better in surface quality.

The invention discloses a high-toughness zinc alloy with a prefabricated quasi-microcrack petal-shaped toughness second phase and a preparation method and application of the high-toughness zinc alloy, and belongs to the technical field of zinc alloy material processing. The microstructure of the high-toughness zinc alloy comprises a prefabricated quasi-microcrack petal-shaped GdZn12 phase or NdZn11 second phase or a mixture of the two second phases, wherein the volume fraction of the prefabricated quasi-microcrack petal-shaped GdZn12 phase or NdZn11 second phase is 3-10%, the average size distribution of the prefabricated quasi-microcrack petal-shaped NdZn12 phase or NdZn11 second phase is 5-40 microns, and the average grain size of matrix grains in the alloy is 0.5-1.2 microns. The degradable zinc alloy has high strength and high toughness at the same time, by means of the good toughness and deformation coordination capacity of the petal-shaped second phase, cracks can be prevented from being generated from the interface of the second phase and a matrix, meanwhile, the petal-shaped second phase can improve the energy absorption capacity through the cracks generated by the petal-shaped second phase, and in other words, the obdurability of the zinc alloy is improved.

The invention relates to the technical field of alloy preparation, particularly provides a 650 DEG C high temperature resistant titanium-based composite material plate, and further provides a preparation method of the plate. The titanium-based composite material plate resistant to the high temperature of 650 DEG C, provided by the invention, is prepared from the following chemical components in percentage by mass: 6.0 percent to 7.0 percent of Al, 1.0 percent to 3.0 percent of Zr, 0.5 percent to 2.0 percent of Mo, 0.4 percent to 1.0 percent of Nb, 0.4 percent to 1.0 percent of W, 0.1 percent to 0.4 percent of Si, 0.4 percent to 0.7 percent of B, 0.01 percent to 0.10 percent of C and the balance of Ti and inevitable impurities. According to the titanium-based composite material component system provided by the invention, a vanadium element which is easy to generate interface reaction at high temperature is abandoned, and refractory metal elements such as niobium and tungsten are adopted to cooperate with a ceramic reinforced phase formed by boron, carbon and the like, so that the high-temperature performance and the thermal stability of the material are improved; meanwhile, by controlling the content of molybdenum, aluminum and other elements within a specific interval, the hot working performance of the material is remarkably improved while high strength is maintained, and the contradiction between insufficient high-temperature performance and poor hot working performance of a traditional titanium-based composite material is effectively solved.

This invention provides a method for improving the microstructure and corrosion uniformity of low-temperature extruded magnesium alloys, belonging to the field of magnesium alloy preparation and processing. The method includes the following steps: S1: Cutting a low-alloy element content magnesium alloy ingot and removing the surface oxide layer to obtain a cast sample; S2: Performing pulsed current homogenization treatment on the cast sample; S3: Removing the surface oxide layer from the homogenized alloy to process it into an extrusion billet; S4: Performing low-temperature extrusion treatment on the extrusion billet under pulsed current assistance. This invention improves the microstructure and corrosion uniformity of low-temperature extruded magnesium alloys while ensuring high strength and plasticity, and is suitable for the efficient and energy-saving preparation of biodegradable magnesium alloy extruded bars and sheets.

The present invention provides a method for improving the thermoplasticity of a hard-to-deform nickel-based powder high-temperature alloy, which solves the technical problem of the difficulty in processing the hard-to-deform nickel-based powder high-temperature alloy. The method steps of the present invention are: (1) determining the full melting temperature Ts of the γ′ phase of the hard-to-deform nickel-based powder high-temperature alloy, and obtaining the preheating temperature T1 as (Ts‑30)‑(Ts‑20)°C; (2) keeping the hard-to-deform nickel-based powder high-temperature alloy at the preheating temperature T1 for a time t; (3) cooling the hard-to-deform nickel-based powder high-temperature alloy in step (2) to 500‑1000°C at a slow cooling rate of 0.8‑1°C / h; (4) air cooling to room temperature, controlling the precipitation of harmful phases, and obtaining a nickel-based powder high-temperature alloy with a locally curved grain boundary and containing a coarse γ′ phase. The present invention can be widely used in the field of material processing technology.

The extrusion integrated forming die for the magnesium alloy comprises a pair of forming dies, two pairs of die fastening bolt openings are formed in each of the two forming dies, the two forming dies are fixedly connected through the two pairs of die fastening bolt openings, a forming channel is jointly formed in the two forming dies, and the die fastening bolt openings are formed in the forming channels. The forming channel sequentially comprises a feeding port, a spherical expansion deformation area, a reducing thread torsion deformation area, a discharging port and a discharging channel from top to bottom, a pressing head is arranged at the top end of the feeding port, and the outer edge of the pressing head is attached to the inner wall of the feeding port; the spherical expansion deformation area can conduct spherical upsetting on the blank, dynamic recrystallization is promoted, dislocation rearrangement is accelerated, the material strength is improved, meanwhile, the machining efficiency is improved, meanwhile, traditional reducing extrusion and rotary extrusion deformation are adopted in the reducing thread torsion deformation area, and the machining efficiency is improved. The material strength is improved by intensifying the internal deformation of the material.

The invention belongs to the technical field of high-temperature alloy preparation, and relates to an oversized fine grain N06625 alloy plate and a rolling method and application thereof. The rolling method comprises the following steps: step 1, selecting a rolling blank with a specific specification; 2, the rolled blank is pretreated, and it is guaranteed that the surface of the rolled blank is free of cracks; 3, heating the rolled blank by using a heating furnace, and preserving heat; and 4, after heat preservation is finished, the alloy plate is discharged out of the furnace and subjected to large-deformation rolling, and the target N06625 alloy plate is obtained. The technical problems that a uniform structure and a fine grain structure are difficult to form in a traditional thermal forming process, and the risk of crystal mixing exists are solved; in addition, due to the fact that N06625 is difficult to form and a hot working window is narrow, N06625 can be formed into an oversized specification at a time through the method, the structure is uniform, and the grain size is larger than or equal to grade 8.

The invention discloses an electric pulse auxiliary cutting-rolling composite surface strengthening device and a machining method, and relates to the technical field of metal material surface treatment, the electric pulse auxiliary cutting-rolling composite surface strengthening device comprises a rolling device and an electric pulse auxiliary turning device; the rolling device comprises a fixed base, a mounting sleeve and rolling assemblies, and the multiple rolling assemblies are evenly arranged in an inner cavity of the mounting sleeve in the circumferential direction; the rolling assembly comprises a floating base, a rolling base, a guide cylinder and a rolling end cover which are connected in sequence, a spherical cavity is formed between the guide cylinder and the rolling end cover, and balls are installed in the spherical cavity; the electric pulse auxiliary turning device comprises a first electric brush and a second electric brush, the first electric brush is installed on the lathe bed and makes contact with the chuck mechanism, the second electric brush is installed on the fixed base and used for making contact with the workpiece, and the first electric brush and the second electric brush are connected with the positive electrode and the negative electrode of the pulse power source respectively. The electric pulse treatment is introduced into the cutting process, the rolling effect can be enhanced, thermal stress and thermal deformation can be reduced during rolling, and the machining precision is improved.

The invention discloses a high-strength and tough zinc alloy with prefabricated quasi-microcrack petal-shaped tough second phase and its preparation method and application, belonging to the technical field of zinc alloy material processing. The high-strength and tough zinc alloy microstructure contains 3-10% volume fraction and 5-40μm average size distribution of prefabricated quasi-microcrack petal-shaped GdZn 12 Phase or NdZn 11 The second phase, or a mixture of two second phases, has an average grain size of 0.5 to 1.2 μm in the matrix grains of the alloy. The degradable zinc alloy of the present invention has both high strength and high toughness. The present invention utilizes the good toughness and deformation coordination ability of the petal-shaped second phase to prevent cracks from initiating at the interface between the second phase and the matrix. At the same time, the petal-shaped second phase can improve the energy absorption capacity by generating cracks by itself, that is, improve the strength and toughness of the zinc alloy.

The present application relates to a kind of nickel-based alloy cartridge manufacturing method, comprising orthogonal experiment steps: blank edge sampling, edge to center sampling;Sample heating and heat preservation, after solution detection sample grain size;Determine forging temperature;Sample cutting sample, sample is heated after upsetting according to different deformation amount, and test sample grain size;Determine forging deformation amount;Upsetting punching step: blank is heated to forging temperature, and is punched;Final forging temperature is: 950 DEG C;Air cooling to room temperature;Hole expansion forging step: blank is heated to forging temperature, and is expanded;Blank hole expansion deformation is forging deformation amount;Final forging temperature is: 950 DEG C;Air cooling to room temperature;Final rolling forging step: blank is heated to forging temperature, and is rolled;Blank rolling deformation is forging deformation amount;Final forging temperature is greater than or equal to 950 DEG C;Air cooling to room temperature to form product.Solve the problem in prior art scheme, selected forging temperature is lower, and it is easy to produce forging crack and forging deformation amount is smaller, and forging fire time is more.

The application provides a kind of superhigh strength corrosion-resistant low alloyed Mg-Al-Mn-Y-Zr alloy and its preparation method, belongs to magnesium alloy technical field.The application uses magnesium, aluminum, magnesium manganese intermediate alloy, magnesium yttrium intermediate alloy, magnesium zirconium intermediate alloy as raw material, is prepared into high-strength corrosion-resistant magnesium alloy after melting casting, solid solution treatment, low-temperature extrusion, the components of the alloy are Al:0.1%;Mn:0.1%;Y:0.1%;Zr:0.1%, the rest is magnesium and unavoidable impurities.The alloy prepared by the application has elongation of 5%, tensile strength of 501.3MPa, yield strength of 400.9MPa, corrosion rate in simulated body fluid of 0.07mm / a, and the preparation method has the advantages of low cost, simple process, short process, etc.

The invention relates to the technical field of conductor preparation, and discloses a high-performance copper bus and a preparation method thereof. The preparation method of the high-performance copper bus comprises the following steps: mixing composite aerogel and copper powder, and performing ball milling to obtain composite powder; adding scandium, chromium, lanthanum, cobalt, nickel, silicon, niobium and tantalum, and crushing to obtain mixed powder; compacting and smelting the mixed powder to obtain a melt; carrying out semi-continuous casting on the melt to obtain a copper busbar semi-continuous blank; carrying out homogenization treatment on the copper busbar semi-continuous blank, and then carrying out cross turnover rolling to obtain a copper busbar blank; pressing the copper busbar blank to form a copper busbar substrate; and carrying out mechanical polishing and ultrasonic cleaning treatment on the copper busbar substrate, then coating the copper busbar substrate with the heat-conducting anticorrosive coating material, and curing to obtain the high-performance copper busbar. The high-performance copper bus has good mechanical performance, electrical conductivity, corrosion resistance and heat dissipation and heat conduction capabilities.

The invention belongs to the technical field of rare earth magnesium alloy materials, and discloses an ultrahigh-strength rare earth magnesium alloy deformed material which is prepared from the following raw materials in percentage by mass: 7%-8.5% of Gd, 2.5%-3.5% of Y, 1.5%-2.5% of Zn, 0.3%-0.5% of Zr, 0.6%-1% of Nd, 1.2%-2% of Ag and the balance of Mg. The invention further discloses a preparation method of the magnesium alloy deformed material. The preparation method comprises the steps of smelting and casting, homogenizing treatment, variable-speed isothermal extrusion treatment, aging treatment and the like. By adding Nd and Ag elements and adjusting the ratio of all metal elements in the alloy, excellent comprehensive mechanical properties are shown, the yield strength ranges from 449 MPa to 454 MPa, the tensile strength ranges from 493 MPa to 502 MPa, and the ductility ranges from 9.4% to 10.1%.