11 results about "Vacuum arc remelting" patented technology

This invention discloses a smelting method for large-size Fe-based superalloys for gas turbines, comprising two steps: casting metal raw materials into 710mm electrode rods in a vacuum induction furnace, and then remelting the electrode rods in a vacuum arc remelting furnace to produce 810mm steel ingots. This invention employs a combined vacuum induction melting and vacuum arc remelting (VIM+VAR) process, which effectively controls Ti element burn-off to ensure its content meets standards, and avoids excessive formation of Ti-based carbonitrides, fundamentally mitigating the negative impact on the purity of the molten steel.

The present invention relates to remelting plants for metals, such as vacuum arc furnaces (vacuum arc remelting, VAR) and electro slag remelting plants (electro slag remelting, ESR), which have one or more melting locations. The plants have a uniformly low overall height and allow weighing with the highest precision. For this purpose, they are provided with a non-coaxially driven electrode rod (140) and a weighing device (230, 240) arranged laterally. The electrode is centered without generating transverse forces which have a negative influence on the plant structure and the weighing result.

The application discloses a kind of multi-scale simulation methods of vacuum self-consumption electric arc smelting process ingot, it is related to metal smelting technical field, including: based on the actual working condition parameters and material thermal physical parameters of vacuum self-consumption electric arc smelting, the three-dimensional geometric model of smelting area is established and function area is divided;Multi-physics field coupling numerical model is constructed in macroscopic simulation software, and simulation calculation result is obtained;Simulation result is input to mesoscopic simulation software through standardized data interface, as the initial condition and boundary condition of mesoscopic scale simulation, based on phase field model and solute diffusion equation, the grain growth morphology, solute distribution and microstructure evolution process are simulated;Crystal growth rate, solidification rate and solute distribution result are fed back to multi-physics field coupling numerical model, and iterative calculation is carried out, to realize the closed loop coupling of macroscopic and mesoscopic simulation.The application realizes the accurate control of ingot microstructure and performance.

This invention relates to the field of high fatigue strength titanium alloy technology, specifically to a method for preparing TA15 alloy bars with high fatigue strength through synergistic regulation. The method involves increasing the content of the main elements Al, Mo, V, and Zr, controlling the content of interstitial elements Fe, O, and C, and adding trace amounts of Nb to obtain a novel TA15 alloy composition. First, a 520mm TA15 alloy ingot is prepared by three vacuum arc remelting processes. Next, the TA15 alloy ingot is forged, and by reducing the forging temperature of the forming passes and increasing the deformation, a 180mm transfer bar is obtained. Subsequently, at the rolling temperature, by controlling the deformation between passes, the 180mm bar is rolled to a 65mm diameter in a single pass. Finally, within the range of 800-850℃, the 65mm bar is solution-treated to obtain a 65mm TA15 alloy bar. The 65mm TA15 alloy bar prepared by this invention has a uniform and fine primary α phase with a primary α phase content of 45~55%, a uniformly broken secondary α phase, and a smooth surface with a high cycle fatigue strength ≥698MPa.

This invention relates to the field of precision alloy material processing technology, and discloses an Invar alloy precision strip for semiconductor displays, its preparation method, and applications. This invention controls sulfur content at the source and combines this with microalloying by adding 0.002–0.005 wt.% rare earth cerium (Ce) to strengthen grain boundaries and improve thermoplasticity. It innovatively employs an ultra-high purity smelting route of "vacuum induction melting (VIM) + two vacuum arc remelting (double VAR)" combined with intermediate forging to remove non-metallic inclusions such as oxides and reduce gas content, obtaining ultra-high purity ingots. Finally, through a multi-stage high-temperature diffusion forging, controlled rolling and cooling, multi-stage intermediate annealing, and precision cold rolling, a precision strip with a thickness of 0.10 mm is prepared. Through the above process, the strip prepared by this invention has extremely high purity, a uniform and fine microstructure (grain size 8–10), and excellent surface quality and shape, fully meeting the stringent requirements of semiconductor display devices for substrates.

The invention belongs to the technical field of titanium alloy material processing, and relates to a segregation-free, high-strength and large-specification Ti6Al6V2Sn titanium alloy forge piece and a preparation method thereof. The thickness of the titanium alloy forge piece manufactured through the method ranges from 350 mm to 420 mm, the width of the titanium alloy forge piece ranges from 420 mm to 470 mm, and the length of the titanium alloy forge piece ranges from 3200 mm to 4400 mm. The method comprises the specific steps that firstly, raw materials of a titanium alloy forge piece are placed in a vacuum consumable smelting furnace, and a Ti6Al6V2Sn cast ingot is prepared through multiple times of smelting; the pretreated cast ingot is sequentially subjected to cogging forging, intermediate forging and finished product forging, and then a finished product forging stock is obtained; and finally, the finished forging stock is subjected to solid solution aging heat treatment, then straightening and machining are sequentially conducted, and the Ti6Al6V2Sn titanium alloy forge piece is obtained and has good strength and plasticity comprehensive performance and can be applied to the high-end equipment manufacturing and key industrial field.

This application discloses a method for controlling white spot defects and a vacuum arc remelting device, belonging to the field of vacuum arc remelting technology. Its main purpose is to achieve real-time identification of electrode shavings and to adjust the power differentially based on the size of the shavings, thereby improving the control effect of white spot defects during the vacuum arc remelting process. The main technical solution of this application is as follows: The white spot defect control method includes: acquiring vacuum arc remelting process parameters; identifying shavings and determining the equivalent size of the shavings based on the process parameters; generating control commands based on the correspondence between the equivalent size of the shavings and at least two determined critical sizes; and adjusting the melting power of the vacuum arc remelting device in response to the control commands.

The invention relates to a nickel-cobalt-based wrought superalloy, a thin-wall annular part and a preparation method of the thin-wall annular part, and relates to the technical field of superalloy design and preparation. According to the main technical scheme, the nickel-cobalt-based wrought superalloy is prepared from the following chemical components: 20 to 30 weight percent of Co, 12.0 to 16.0 weight percent of Cr, 4.0 to 6.0 weight percent of Ti, 2.0 to 3.0 weight percent of Al, 1.0 to 3.0 weight percent of W, 2.0 to 4.0 weight percent of Mo, 0.01 to 0.06 weight percent of C, 0.01 to 0.06 weight percent of Zr, 0.01 to 0.06 weight percent of B, less than or equal to 2.0 weight percent of Nb and the balance of Ni. The thin-wall annular part is made of the nickel-cobalt-based wrought superalloy. A vacuum induction furnace, protective atmosphere electroslag remelting and vacuum consumable electrode furnace smelting are adopted for preparing a cast ingot of the components, then homogeneous bar preparation is conducted, then ring piece forming is conducted, and finally solid solution aging treatment is conducted, so that the thin-wall ring piece is obtained. The preparation method is used for improving the temperature bearing capacity of the nickel-cobalt-based wrought superalloy and ensuring the hot working performance, so that the thin-wall annular part with the temperature bearing capacity reaching 800 DEG C or above, such as a case for an engine, is prepared.

The invention discloses a multi-scale simulation method for ingot casting in a vacuum self-consuming arc melting process, and relates to the technical field of metal smelting, and the method comprises the following steps: based on actual working condition parameters and material thermophysical parameters of vacuum self-consuming arc melting, establishing a three-dimensional geometric model of a casting area, and carrying out functional area division; a multi-physics field coupling numerical model is constructed in macroscopic simulation software, and a simulation calculation result is obtained; a simulation result is input into mesoscale simulation software through a standardized data interface to serve as an initial condition and a boundary condition of mesoscale simulation, and the grain growth morphology, solute distribution and microstructure evolution process are simulated based on a phase field model and a solute diffusion equation; and feeding back a crystal growth rate, a solidification rate and a solute distribution result to the multi-physics field coupling numerical model, and carrying out iterative calculation to realize closed-loop coupling of macroscopic and mesoscopic simulation. According to the method, the structure performance of the cast ingot is accurately controlled.

The present application relates to the metallurgical technology field, especially relate to a kind of off-oven refining combined vacuum arc remelting preparation ultra-pure stainless steel method.The preparation method of the present application is by AOD station to transfer the crude molten steel obtained by EAF smelting to AOD refining furnace to blow oxygen refining, pre-reduction refining slag is CaO-CaF2-SiO2-MgO slag system;After pre-reduction treatment, reduction treatment is carried out, and the reduction refining slag is CaO-CaF2-SiO2-MgO slag system;The molten steel after reduction treatment is transferred to VD furnace for vacuum treatment, and the treated molten steel is transferred to ladle, then poured into mold, and ingot is obtained;After ingot is forged into electrode, ultra-pure stainless steel is prepared by VAR, with ultra-high cleanliness, coarse system inclusions is 0 level, fine system A+B+C+D inclusions≤0.5 level, effectively realize the accurate low control of aluminum content in steel, and simultaneously reduce the oxygen content and non-metallic inclusion content in steel, finally prepare high-quality ultra-pure stainless steel.

The present invention relates to remelting plants for metals, such as vacuum arc remelting (VAR) furnaces and electroslag remelting (ESR) plants, which have one or more melting points. The plants have a consistently low overall height and enable weighing with the highest accuracy. For this purpose, they are equipped with a non-coaxially driven electrode rod and a laterally arranged weighing device. The electrode is centered without generating transverse forces that could negatively affect the plant design and the weighing result.