107 results about "Vacuum arc remelting" patented technology

A method of producing a nickel base alloy includes casting the alloy within a casting mold and subsequently annealing and overaging the ingot at at least 1200° F. (649° C.) for at least 10 hours. The ingot is electroslag remeelted at a melt rate of at least 8 lbs/min (3.63 kg/mm.), and the ESR ingot is then transferred to a heating furnace within 4 hours of complete solidification and is subjected to a novel post-ESR heat treatment. A suitable VAR electrode is provided form the ESR ingot, and the electrode is vacuum arc remelted at a melt rate of 8 to 11 lbs/minute (3.63 to 5.00 kg/minute) to provide a VAR ingot. The method allows premium quality VAR ingots having diameters greater than 30 inches (762 mm) to be prepared from Alloy 718 and other nickel base superalloys subject to significant segregation on casting.

The invention discloses titanium reinforced high-cobalt martensitic aged anti-corrosion ultrahigh-strength steel and a preparation method, belonging to the technical field of alloy steel. The steel comprises the following chemical components in percentage by weight: less than or equal to 0.01% of C, 7.0 to 14.0% of Cr, 3.0 to 11.0% of Ni, 5.0 to 17.0% of Co, 0 to 6.0% of Mo, 0.3 to 2.0% of Ti, less than or equal to 0.3% of Al, and the balance of Fe and inevitable impurity elements. The preparation method preferably adopts smelting processes of vacuum induction, vacuum arc remelting or vacuum induction, electroslag remelting and the like. Compared with the prior art, the steel has the advantages that the comprehensive performance is good under the co-action of high Ti and Co content in the alloy, and the steel has strong toughness matching, higher strength and better stress corrosion resistance at the same time due to the corresponding Cr.

A method (20) of fabricating a large component such as a gas turbine or compressor disk (32) from segregation-prone materials such as Alloy 706 or Alloy 718 when the size of the ingot required is larger than the size that can be predictably formed without segregations using known triple melt processes. A sound inner core ingot (12) is formed (22) to a first diameter (D₁), such as by using a triple melt process including vacuum induction melting (VIM), electroslag remelting (ESR), and vacuum arc remelting (VAR). Material is than added (26) to the outer surface (16) of the core ingot to increase its size to a dimension (D₂) required for the forging operation (28). A powder metallurgy or spray deposition process may be used to apply the added material. The added material may have properties that are different than those of the core ingot and may be of graded composition across its depth. This process overcomes ingot size limitations for segregation-prone materials.

A method for designing a low cost, high strength, high toughness martensitic steel in which a mathematical model is used to establish an optimum low cost alloying concentration that provides specified levels of strength toughness. The model also predicts critical temperatures and the amount of retained austenite. Laboratory scale ingots of the optimum alloying composition were produced comprising by % wt. of about: 0.37 of C; 1.22 of Ni; 0.68 of Mn; 0.86 of Si; 0.51 of Cu; 1.77 of Cr; and 0.24 of V; and the balance Fe and incidental impurities were melted in an open induction furnace. After homogenized annealing, hot rolling, recrystallization annealing, and further oil quenching, refrigerating, and low tempering, a tempered martensite microstructure was produced consisting of small packets of martensitic laths, fine vanadium carbide, as centers of growth of the martensitic lathes, and retained austenite. Mechanical tests showed the following results: HRC of 52; UTS of 282 ksi; YS of 226 ksi; Charpy V-notch impact toughness energy of 31 ft-lbs. Energy consumption vacuum arc remelting (VAR) and electroslag remelting (ESR) were not required for improving strength and toughness.

The invention provides a special Ti-6Al-3V welding wire for Ti-6Al-4V ELI titanium alloy and a machining process of the special Ti-6Al-3V welding wire. The special Ti-6Al-3V welding wire includes the alloy components of, by weight, 5.5-6.75% of Al, 2.5-4.5% of V, smaller than 0.20% of Fe, smaller than 0.13% of O and the balance Ti. The machining process of the special Ti-6Al-3V welding wire includes the following steps that a, the raw material weight ratio of Al-V intermediate alloy to pure metal aluminum to titanium sponge is calculated according to the design components of the welding wire, and the raw materials are smelted into ingots through vacuum arc remelting; b, the ingots are forged into bar billets; c, the bar billets are rolled into bars; d, the bars are rolled into wire billets; e, the wire billets are stretched; f, the wire billets are straightened, descaled, polished and ground; g, the wire billets are thermally treated and then stretched into wires; h, vacuum annealing is conducted on the wires after alkaline washing and acid washing are conducted on the wires; i, the wires are straightened and then cut into straight wires; j, the straight wires are ground into finished products. Through the adjustment of the content of main alloy elements and impurity elements and the reasonable production process, the titanium welding wire with better mechanical performance matching performance with the Ti-6Al-4V ELI titanium alloy is produced, and the performance of a weld joint of the welding wire can meet the index requirements of a manned cabin.

The invention discloses a method and a device for remelting and refining metals by a vacuum magnetic-control arc. According to the method and the device, a magnetic field generator is applied on the tail end of a vacuum arc remelting electrode and the periphery of a metal melting pool; the magnetic field generator is composed of two groups of concentric coils; a direct current and an alternating current are charged respectively; and a static magnetic field component generated by charging the direct current forms an inhibition effect on charged particles which radially move, thus delaying generations of an inter-electrode ion-lacking phenomenon and anode spots, reducing the voltage and the energy of the arc, and preventing that an agglomerated arc is formed to remelt so that the local temperature of the electrode is too high to generate serious fusion and vaporization to influence metallurgical quality; meanwhile, the alternating magnetic field component generated by charging the alternating current is capable of forming a certain pressure gradient in the metal melting pool, and generating pressure wave broken dendrites; in additional, a certain included angle always exists between the alternating magnetic field and the current of the direct-current arc, so that a certain oscillation Lorentz force is formed, thus contributing to break dendrites, refine solidification structures and reduce cast ingot segregations.

The invention discloses a preparation method of a solid cored welding wire for molten-salt corrosion resistance nickel-base superalloy welding, and belongs to the technical field of metal welding. The method includes the technological processes of vacuum smelting, vacuum arc remelting, homogenization, hot forging cogging, hot rolling, solution treatment, acid pickling, coating, cold drawing, coating removal and bright annealing. The invention further discloses the solid cored welding wire for molten-salt corrosion resistance nickel-base superalloy welding. The solid cored welding wire is prepared through the method. Compared with the prior art, by the adoption of the method, high-quality solid cored welding wires of various diameters for molten-salt corrosion resistance nickel-base superalloy welding can be produced with the extremely-high rolling yield in a batch mode, and the prepared solid cored welding wire can meet the requirement for welding molten-salt reactor structural materials.

The invention discloses an efficient energy-saving short-process technology for preparing high-quality titanium alloy Ti-Ni-Nb, and provides a titanium alloy preparation technology. The novel technical process is mainly composed of a titanium and titanium alloy crucible-type vacuum induction melting (VIM) technology and a titanium and titanium alloy cold-hearth melting (CHM) technology. The VIM technology is used for primary ingot casting of titanium and titanium alloy preparation, and the electrode preparation of vacuum arc remelting (VAR) electrode arc melting alloy and primary alloy melting of a traditional preparation technology are replaced. The CHM technology is used for secondary refining of the primary titanium and titanium alloy ingot, and then the titanium and titanium alloy ingot in a required shape is prepared. By means of the efficient energy-saving titanium alloy Ti-Ni-Nb preparation technology, the alloy preparation process can be simplified, and high quality alloy ingots in various shapes can be produced.

A method for the production of a γ-TiAl base alloy by vacuum arc remelting, which γ-TiAl base alloy solidifies via the (β-phase (β-γ-TiAl base alloy), comprises the following method steps:

• • forming a basic melting electrode by melting, in at least one vacuum arc remelting step, of a conventional γ-TiAl primary alloy containing a lack of titanium and/or of at least one (β-stabilising element compared to the (β-γ-TiAl base alloy to be produced;
  • allocating an amount of titanium and/or (β-stabilising element to the basic melting electrode, which amount corresponds to the reduced amount of titanium and/or (β-stabilising element, in an even distribution across the length and periphery of the basic melting electrode;
  • adding the allocated amount of titanium and/or (β-stabilising element to the basic melting electrode so as to form the homogeneous (β-γ-TiAl base alloy in a final vacuum arc remelting step.

The invention discloses a tungsten-containing titanium alloy smelting method. Based on weight percent, 0.1 to 10 percent of tungsten powder is added when granular or chip titanium alloy raw material is mixed, and a tungsten-containing titanium alloy ingot with uniform components is obtained through multiple vacuum arc remelting. The tungsten powder is used as a raw material to be added into the tungsten-containing titanium alloy; because middle processes of preparing a tungsten rod from the tungsten powder by powder metallurgy and subsequent deformation processing technology and performing vacuum arc remelting on the tungsten rod and titanium sponge to form titanium tungsten intermediate alloy are saved, the production cost of the tungsten-containing titanium alloy is greatly reduced, the tungsten-containing titanium alloy ingot with uniform components and no segregation or inclusion can be obtained, and obvious economic benefit can be achieved.

The invention discloses double-phase high-density kinetic energy tungsten-nickel-cobalt alloy capable of being cast and forged and a preparation method, and belongs to the field of kinetic energy alloy. The double-phase high-density kinetic energy tungsten-nickel-cobalt alloy comprises, by weight, 35-65% of W, 0-3% of Ti, 0-3% of Al, 0-8% of Nb, 0-10% of Ta and the balance Ni or Co or NiCo, unavoidable impurity elements and micro elements like rare earth. The preparation method adopts vacuum induction plus vacuum arc remelting. Compared with the prior art, the double-phase high-density kinetic energy tungsten-nickel-cobalt alloy capable of being cast and forged is good in comprehensive performance, has high density, high rigidity, super high strength, super high dynamic strength and other excellent properties, the density can reach 11.0-15.0 g/cm<3>, the impact rigidity can reach 80 J/cm<2> or higher, the static tensile strength can reach 1300 MPa or higher, and the dynamic compression strength can reach 1800 MPa or higher.

A light-weight, high-strength, and high-elasticity titanium alloy and an implementation method thereof. The titanium alloy is specifically Ti-8Al-2V-1Cr-0.75Zr, wherein the content of Al is 7.0% to 9.5%, the content of V is 0.5% to 4.0%, the content of Cr is 0.5% to 3.5%, the content of Zr is 0.5% to 2.0%, and the balance is Ti. The titanium alloy is obtained by vacuum arc remelting(VAR), after mold pressing through the adoption of sponge titanium, vanadium, chromium, aluminum zirconium pure, pure aluminum, aluminum vanadium alloy mixed consumable electrode. The titanium alloy is simple in preparation processing steps, low in processing cost, easy in production, and is applicable to various application fields with a requirement for a low-density and high-strength titanium alloy.

The invention provides a metal-mold precision casting method for zirconium and zirconium alloy. The metal-mold precision casting method includes processing a metal mold, painting a high-temperature resistant coating on the inner surface of a mold cavity of the metal mold, and pouring zirconium alloy liquid into the metal mold by a vacuum-arc-remelting kish smelting method. The high-temperature resistant coating comprises, by weight, 55-70% of fire-proof powder, 30-45% of binder, 0.1-1% of surface active agent and 0.1-1% of antifoaming agent. The fire-proof powder is composed of one of Y2O3 (yttrium oxide) powder and ZrO2 (zirconium oxide) powder. The metal mold is simple in technique and convenient to process, and has wide material sources and service life of 10-50 times; for small-batch zirconium and zirconium alloy, production cycle is short and production efficiency is high.

The invention relates to a multi-component alloy composite reinforced high-strength titanium alloy and preparation thereof. The alloy comprises the following components in percentage by weight: 7-9% of vanadium, 3-5% of molybdenum, 2.5-3.5% of aluminum, 1.5-4.5% of chromium, 0.5-4.5% of zirconium, 0.5-3.5% of niobium and the balance of titanium and inevitable impurities. The preparation method comprises the following steps: melting in a vacuum arc remelting furnace; and peeling a melted titanium alloy ingot blank, performing hot forging, performing hot rolling, performing solution treatment, and aging to obtain the high-strength titanium alloy material. The titanium alloy prepared by the invention has excellent strength and plasticity matching; and the tensile properties at room temperature are as follows: sigma b is no less than 1300MPa, delta is no less than 10%, and psi is no less than 30%. The alloy material provided by the invention can be prepared into rods and plates, is applicable to high-strength fasteners, high-strength load-carrying structural parts, high-elasticity springs and the like, and has wide application prospects.

The invention discloses a preparation method of a short fiber reinforced high-temperature titanium alloy bar for 700-750 DEG C. The alloy comprises components, by mass: 5.0%-7.0% of Al, 1.5%-4.5% of Sn, 2.0%-4.5% of Zr, 0.1%-1.0% of Mo, 0.1%-0.6% of Si, 0.1%-0.8% of Nb, 0.1%-1.8% of Ta, 0.1-1.2% of B, 0.08% or less of C, less than 0.3% of Fe, less than 0.15% of O, less than 0.05% of N, less than 0.012% of H, and the balance Ti and unavoidable impurities. The preparation method of the short fiber reinforced high-temperature titanium alloy bar comprises the following steps that electrodes are pressed according to required ingredients and smelted into an alloy ingot through vacuum arc remelting for 2-3 times; the alloy ingot is heated to 1180 DEG C-1220 DEG C and forged in a beta phase region; the forged blank is heated again until the billet is repeatedly coarsened and drawn to the required size within the range of 30 DEG C-100 DEG C below the beta phase transformation point, the macrostructure of the billet is fuzzy crystal, and visible TiB whiskers are dispersed and distributed in the microstructure. After the bar prepared by the method is subjected to solid solution and aging heattreatment, the tensile strength is obviously improved compared with a bar without B.

The invention discloses an integrated manufacturing method of an ultrahigh-strength alloy steel blind hole component. The method includes the steps of steel ingot preparation, heading and drawing cogging, integrated hot forming, heat treatment and other process steps. According to steel ingot preparation, a steel ingot casting blank is prepared through a method of refining outside an electric arc furnace and a vacuum furnace and vacuum arc remelting; according to the heading and drawing cogging, a steel ingot is heated to the initial forging temperature ranging from 1100 DEG C to 1200 DEG C, upsetting and drawing out are performed, the final forging temperature ranges from 800 DEG C to 900 DEG C, and circulation is performed in this way 2-4 times; and according to the heat treatment, oil quenching is performed after heat preservation is performed for 0.5-1 min at the temperature ranging from 860 DEG C to 900 DEG C, and then tempering is performed for 2-3 h at 260 DEG C to 300 DEG C. By means of the integrated manufacturing method, the overall strength and toughness performance of the ultrahigh-strength alloy steel blind hole component can be improved, the breakage toughness of the ultrahigh-strength alloy steel blind hole component can be improved, the smelting cost of an ultrahigh-strength alloy is reduced, and material waste is reduced.

A method of making an alloy of niobium that includes: A) forming a blend comprising niobium powder and a powder of a metal selected from the group consisting of yttrium, aluminum, hafnium, titanium, zirconium, thorium, lanthanum and cerium and pressing the blend to form pressed blend; B) attaching the pressed blend to an electrode comprising niobium; C) melting the electrode and pressed blend under vacuum arc remelting conditions, such that the blend mixes with the melted electrode; D) cooling the melted electrode to form an alloy ingot; and E) applying thermo-mechanical processing steps to the alloy ingot to form a wrought product. The method provides a fully recrystallized niobium wrought product with a grain size finer that ASTM 5, that can be used to make deep drawn cups and sputtering targets.

A top drive thrust bearing configured for use in a heavy loaded top drive system. The top drive thrust bearing includes an upper plate; a lower plate; and a plurality of rollers disposed between the upper plate and the lower plate. The composition of the top drive thrust bearing comprising a non-vacuum arc remelted steel including, in weight percent (%), about 0.15% to about 0.18% carbon (C), about 0.15% to about 0.4% silicon (Si), about 0.4% to about 0.7% manganese (Mn), 0% to about 0.025% phosphorus (P), about 0.0005% to about 0.002% sulfur (S), about 0.0002% to about 0.0007% oxygen (O), about 0.001% to about 0.003% titanium (Ti), about 1.3% to about 1.6% chromium (Cr), about 3.25% to about 3.75% nickel (Ni), about 0.0005% to about 0.003% calcium (Ca), about 0.15% to about 0.25% molybdenum (Mo), balance iron (Fe). The top drive thrust bearing of the top drive system is configured to achieve an extended life cycle at least about equivalent to a life factor of three for a vacuum arc remelted steel.