Thermomechanical processing of nickel-based alloys

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, specifically to thermomechanical treatment of nickel-based alloys. Method for thermomechanical treatment of nickel-based alloy includes a first step of heating a workpiece to temperature 1,093–1,163 °C, a first step of rotary forging workpiece heated to 1,093–1,163 °C with reduction of cross section area by 30–70 %, a second step heating workpiece to temperature 954–1,052 °C, wherein between end of first forging step and beginning of second step of heating workpiece is kept at temperature below temperature of dissolution of carbides M23C6 and does not allow it to cool to ambient temperature, and second step of rotary forging workpiece heated to 954–1,052 °C with reduction of cross section area by 20–70 %.

EFFECT: treated alloys are characterised by stability and high strength in a wide range of high temperatures.

45 cl, 3 dwg, 1 ex

 



 

Same patents:

FIELD: process engineering.

SUBSTANCE: invention relates to instrument making and can be used for production of resilient suspensions of sensors incorporated with DAGs. First, suspension barrel-like blank is made and subjected to thermal cyclic processing. Said blank is machined to get a spider section and hardened in dispersion process. This blanks is subjected to stabilizing ageing at 160-170°C for 6-8 hours and to spark-erosion processing for removal of material from spider bores to ensure depth of required stiffness. Note here that prior to stabilizing ageing, cyclic dispersion hardening is executed. Note also that in first cycle the blank is heated to 745-755°C, held for 15 minutes and water-cooled to 20°C. In second cycle, it is heated to 695-705°C, held for 15 minutes and water-cooled to 20°C. In third cycle, it is heated to 595-605°C, held for 15 minutes and water-cooled to 20°C.

EFFECT: higher fatigue strength.

1 ex

FIELD: process engineering.

SUBSTANCE: invention relates to instrument making and can be used for production of resilient suspensions of sensors incorporated with DAGs. To up the fatigue strength of DAG suspension, its barrel-like blank is, first, made. Said blank is subjected to heat processing and machining. Then, it is subjected to dispersion hardening at 680-700°C for 3-4 hours and stabilisation ageing at 160-170°C for 6-8 hours. Now, it is subjected to EDM processing to remove material from spider holes with ensure the required depth of spiders. Note here that heat processing comprises thermocyclic quenching performed at three steps. Note also that every cycle comprises heating to 900-920°C for 2 minutes and cooling in water 20°C.

EFFECT: higher fatigue strength.

1 tbl, 1 ex

FIELD: medicine.

SUBSTANCE: method comprises temporary fixation of tooth fragments with aluminium bronze ligature, cavity preparation, instrumental and antiseptic treatment, formation of lock passages for a lock inlay and final fixation of the bone fragments by means of the lock inlay with two legs and tooth crown restoration. The lock passages for the lock inlay represent through holes in the fragments of the tooth crown, wherein the lock inlay is placed in the form of a waved shape-memory NiTi wire section 1.5-2.0 mm in diameter, 5-10 mm long having legs formed by ends 2-3 mm long curved at an angle of 90°-100°; before being attached to the fragment walls of the tooth crown, the lock inlay is cooled down by means of a cryoinjector; the lock inlay with its legs is unbent in a straight line and inserted into the drilled holes up to leg bends.

EFFECT: method is simple and high-effective treatment of crown-radicular fractures of multi-rooted teeth.

2 ex

FIELD: metallurgy.

SUBSTANCE: dispersion-hardened heat-resistant alloy based on Ni contains the following, wt %: C 0.01 or less, Mn 0.5 or less, P 0.01 or less, S 0.01 or less, Si 2.0-3.0, Cr 23-30, W 7.0-14.0, Fe 10-20 and Ni 40-60. Total content of C, N, O, P and S is 0.01 wt % or less. Silicide is dispersed and emitted, and size of grains of matrix austenite is controlled by thermomechanical treatment.

EFFECT: heat-resistant alloy has high resistance to irradiation and corrosion resistance.

9 cl, 10 dwg, 4 tbl

FIELD: metallurgy.

SUBSTANCE: invention relates to corrosion-resistant heat-resistant alloys based on nickel and can be used for manufacture of parts of a hot path of gas-turbine units operating in corrosive media. Heat-resistant alloy based on nickel contains the following, wt %: carbon 0.05-0.09; chrome 15.4-15.8; cobalt 10.0-10.4; tungsten 5.0-5.3; molybdenum 1.6-1.8; titanium 4.3-4.5; aluminium 3.0-3.2; boron 0.06-0.09; zirconium <0.015; hafnium 0.2-0.3; silicone <0.1; iron <0.1; copper <0.05; sulphur <0.005; nitrogen <20 ppm; oxygen <15 ppm, cerium <0.015; niobium 0.1-0.2; yttrium <0.03; manganese <0.1; phosphorus <0.005 and nickel is the rest. A manufacturing method of blades of gas-turbine units from heat-resistant alloy based on nickel is characterised by the fact that heat treatment is performed by homogenising annealing and ageing. Homogenising annealing is performed in inert atmosphere at heating rate of 5-10°C/min to the temperature of 1060±10°C, with exposure during 3-4 hours and cooling to the rate of 30-50°C/min to the temperature of 600-700°C and further to room temperature. Ageing is performed at the temperature of 850±10°C during 16 hours with further cooling in the air to room temperature.

EFFECT: increasing strength, ductility and corrosive resistance of an alloy with an equiaxial structure in combination with high structural stability for operating life and reduced level of gas shrinkage porosity.

2 cl, 2 tbl

FIELD: process engineering.

SUBSTANCE: set of invention relates to production of thin bars and wires with shape memory effect and superplasticity from alloys of nickel-titanium system to be used in aircraft engineering, radio electronics, medicine, etc. Proposed method consists on production of the alloy with shape memory effect. Bar-like blank is made from said alloy by compaction or helical rolling and heated to make the bar by rotary swaging in several steps to required size with intermediate heating between swaging steps. Blank is heated before rotary swaging to 300-500°C. Method of alloy production for further making of the bar consists in facing the high-strength graphite crucible walls and bottom by nickel plates. The rest mix is placed inside the crucible to fuse in vacuum induction furnace. The melt is held, teemed in vacuum into chill mould and cooled down to get the ingots. Thereafter, electrode is made from obtained ingots or from bard produced from said ingots. Electrode material is subjected to electron beam smelting in vacuum of at least 5x10-3 Hg mm to form the ingot in copper casting mould.

EFFECT: wire production from bar by hot or cold drawing.

9 cl, 2 tbl

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, in particular, to obtaining of heat resistant nickel-based alloys with high creep and stretching resistance. The method of manufacture of the part blank from nickel-based superalloy, containing, at least, Ni - 50 wt % and in total, at least, Nb and Ta - 2.5 wt %, comprises the obtaining of the named superalloy and execution of heat treatment of the named superalloy. Heat treatment of the named superalloy is performed in a number of stages. The first stage is performed at the temperature 900-1000°C within at least 30 minutes, and the second stage - at the temperature 940-1020°C within 5-90 minutes, meanwhile the difference of temperatures between the named two stages amounts at least 20°C.

EFFECT: nickel-based alloy has high parameters of creep and stretching resistance.

21 cl, 9 dwg, 3 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to hydrogen accumulator alloys. A Ni-B alloy with structural defects, which is obtained by crystallising a Ni-B melt under the effect of pulsed electric current, is used as a hydrogen accumulator.

EFFECT: formation of a large amount of alloy structural defects which are hydrogen saturation centres of the alloy, which enables to use the obtained hydrogen accumulator in producing vehicle energy machines.

FIELD: metallurgy.

SUBSTANCE: invention can be used for production of actuators, transducers and dampers. Proposed method comprises homogenising annealing of Fe-Ni-Co-Al-Ti ferromagnetic alloy monocrystals including the following components, in wt %: Fe - 42.8, Ni - 30.7, Co - 18.4, Al - 5.8, Ti - 2.3 in atmosphere of inert gas He at 1250°C 10 hours, heating and holding at 1280°C for 1 h with subsequent quenching in water of room temperature and ageing in atmosphere of inert gas He at 600-700°C for 1-7 hours with subsequent cooling in water.

EFFECT: shape memory effect and superelasticity.

1 tbl, 1 ex

FIELD: metallurgy.

SUBSTANCE: invention refers to metallurgy, and namely to heat-resistant nickel-based alloys and may be used during manufacturing of gas-turbine engines discs workpieces. Heat treatment method of gas-turbine engines discs from heat-resistant nickel-based alloys includes workpieces agening with further cooling in the air. Then repeated agening is performed in three stages with heating at the first stage to the temperature of 250-270 °C below temperature of complete dissolution of γ'-phase, and at the second and the third stages - to 750 and 700 °C respectively, at that at each of the tree stages workpieces are exposed from 2 to 17 hours and cooled in the air.

EFFECT: method allows increasing long-term strength values and stabilising mechanical properties of nickel-based alloys.

1 tbl, 1 ex

FIELD: engines and pumps.

SUBSTANCE: invention can be used in engine building. Outlet valve (1) is intended to be used in an internal combustion engine. Outlet valve (1) includes stem (14) and valve disk (11) on the lower end of stem (14). Upper surface of valve disk (11) has mounting chamfer (10). Valve disk (11) is made from basic material; the mounting chamfer consists of material of the mounting chamfer, which differs from basic material. Material of the mounting chamfer represents an alloy on the basis of nickel. An alloy, with specification of a composition in percent by weight and without considering any common impurities and inevitable residual amounts of components of deoxidising agents, contains Cr at least 34.0 to 44.0%, total amount of Nb and Ta in the range of at least 2.8 to 6.1%, 0.3 to 2.0% Ti, not more than 0.2% Al, not more than 0.04% B, not more than 0.8% Fe, not more than 0.04% C, not more than 0.4% Si and Ni is the rest, where the amount of Ti+Nb+0.5×Ta varies in the range of 3.4 to 6.6%, with that, the amount of Nb+0.5×Ta is less than 3.0% if the amount of Ti is more than 1.5%. The invention describes a manufacturing method of the outlet valve.

EFFECT: improvement of mechanical properties of a valve in combination with increase of stability to high-temperature corrosion.

16 cl, 4 tbl, 7 dwg

FIELD: metallurgy.

SUBSTANCE: heat resistant alloy on Ni base contains in wt %: C ≤ 0.15, Si ≤ 2, Mn ≤ 3%, P ≤ 0.03, S ≤ 0.01, Cr 15 and over or below 28, Mo from 3 to 15, Co over 5 and 25 max., Al from 0.2 to 2, Ti from 0.2 to 3, Nd from f1 to 0.08 and O ≤ 0.4Nd. At that lower limit of Nd is determined by the following expression f1 = 1.7×10-5d+0.05{(Al/26.98)+(Ti/47.88)}, where d is mean grain size, mcm, and each element symbol means content in wt %.

EFFECT: alloy is characterised by increased plasticity after long-term operation at high temperatures, at that SR-cracking can be excluded.

3 cl, 3 tbl

FIELD: metallurgy.

SUBSTANCE: invention can be used to weld parts out of high nickel alloys of high temperature units with operation temperature up to 950°C. Welding wire contains in wt %: carbon 0.01-0.05, silicon 0.05-0.2, manganese 1.3-2.0, chrome 14.0-16.0, molybdenum 6.0-7.0, tungsten 2.5-3.5, iron 17.0-20.0, nitrogen 0.01-0.04, yttrium 0.01-0.1, zirconium 0.05-0.15, calcium 0.001-0.1, sulphur below 0.010, phosphorus below 0.015, nickel - rest.

EFFECT: welding wire is characterised by improved process strength and high short-term mechanical properties and long-term strength.

2 cl, 3 tbl

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, in particular to oxidation resistant Ni based alloys. Oxidation resistant Ni alloy contains in wt %: 4-7 Cr, 4-5 Si, 0.1-0.2 Y, 0.1-0.2 Mg, 0.1-0.2 Hf, Ni and inevitable admixtures - rest.

EFFECT: alloy can be used as material of N type thermocouple enclosure as has improved creep properties at high temperatures.

8 cl, 3 dwg, 1 tbl

FIELD: metallurgy.

SUBSTANCE: protective coating for protection of a structural component of a gas or a steam turbine against corrosion and/or oxidation, namely at high temperatures, which is made in the form of a single metal layer from an alloy containing the following, wt %: cobalt 24-26, chrome 12-14, aluminium 10-12, and 0.2-0.5 of at least one element of the group including scandium and rare-earth elements, and nickel is the rest. The coating has no tantalum, rhenium and silicone.

EFFECT: coating is characterised by high properties of resistance to high-temperature corrosion and oxidation.

4 cl, 5 dwg

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, and namely to nickel-based alloys to manufacture mechanical components of the turbomachines. Nickel-based super alloy for the mechanical component of the turbomachines contains, wt %: chrome - from 3 to 7, tungsten - from 3 to 15, tantalum - from 4 to 6, aluminium - from 4 to 8, carbon below 0.8, nickel and admixtures - rest. Mechanical components made from the specified alloy can operate under high temperatures.

EFFECT: alloy is characterised by high mechanical, chemical and thermal strength.

10 cl, 8 dwg

FIELD: metallurgy.

SUBSTANCE: nickel-based heat-resistant alloy contains the following, wt %: carbon 0.02÷0.06, silicon 0.05÷0.30, manganese 1.3÷1.7, chrome 18÷20, nickel 53÷56, molybdenum 5.0÷7.0, tungsten 2.0÷3.0, zirconium 0.05÷0.015, nitrogen 0.01÷0.03, yttrium 0.01÷0.05, boron 0.001÷0.005, aluminium 0.05÷0.15, iron and admixtures - balance.

EFFECT: alloy is characterised by high values of long-term strength, increased produceability during manufacturing of large-size forgings and during welding.

2 cl, 3 tbl

FIELD: metallurgy.

SUBSTANCE: dispersion-hardened heat-resistant alloy based on Ni contains the following, wt %: C 0.01 or less, Mn 0.5 or less, P 0.01 or less, S 0.01 or less, Si 2.0-3.0, Cr 23-30, W 7.0-14.0, Fe 10-20 and Ni 40-60. Total content of C, N, O, P and S is 0.01 wt % or less. Silicide is dispersed and emitted, and size of grains of matrix austenite is controlled by thermomechanical treatment.

EFFECT: heat-resistant alloy has high resistance to irradiation and corrosion resistance.

9 cl, 10 dwg, 4 tbl

FIELD: metallurgy.

SUBSTANCE: proposed refractory nickel based alloy comprises the following components in wt %: carbon 0.005-0.12; chrome 11.5-12.4; cobalt 8.0-8.7; tungsten 6.7-7.4; molybdenum 0.25-0.55; titanium 4.0-4.2; aluminium 3.9-4.2; boron 0.001-0.012; manganese ≤0.12; silicon ≤0.10; niobium 0.8-1.0; magnesium ≤0.12; calcium ≤0.12; copper ≤0.05; iron ≤0.1; sulphur ≤0.005; phosphorus ≤0.005; nitrogen ≤10.0 ppm, oxygen ≤10.0 ppm, nickel - rest, at that ration between titanium and aluminium is 0.95-1.07.

EFFECT: alloy is characterised with increased long-term strength in combination with high corrosion resistance, high structural stability for service life.

2 tbl

FIELD: metallurgy.

SUBSTANCE: invention relates to corrosion-resistant heat-resistant alloys based on nickel and can be used for manufacture of parts of a hot path of gas-turbine units operating in corrosive media. Heat-resistant alloy based on nickel contains the following, wt %: carbon 0.05-0.09; chrome 15.4-15.8; cobalt 10.0-10.4; tungsten 5.0-5.3; molybdenum 1.6-1.8; titanium 4.3-4.5; aluminium 3.0-3.2; boron 0.06-0.09; zirconium <0.015; hafnium 0.2-0.3; silicone <0.1; iron <0.1; copper <0.05; sulphur <0.005; nitrogen <20 ppm; oxygen <15 ppm, cerium <0.015; niobium 0.1-0.2; yttrium <0.03; manganese <0.1; phosphorus <0.005 and nickel is the rest. A manufacturing method of blades of gas-turbine units from heat-resistant alloy based on nickel is characterised by the fact that heat treatment is performed by homogenising annealing and ageing. Homogenising annealing is performed in inert atmosphere at heating rate of 5-10°C/min to the temperature of 1060±10°C, with exposure during 3-4 hours and cooling to the rate of 30-50°C/min to the temperature of 600-700°C and further to room temperature. Ageing is performed at the temperature of 850±10°C during 16 hours with further cooling in the air to room temperature.

EFFECT: increasing strength, ductility and corrosive resistance of an alloy with an equiaxial structure in combination with high structural stability for operating life and reduced level of gas shrinkage porosity.

2 cl, 2 tbl

FIELD: metallurgy, in particular intermetallic Ni3Al-based alloy and product made from the same.

SUBSTANCE: claimed alloy contains (mass %) Al 8.0-9.0; Cr 4.5-5.5; W 1.8-2.5; Mo 4.5-5.5; Ti 0.6-1.2; C 0.12-0.2; Co 3.5-4.5; La 0.0015-0.015; Zr 0.05-0.05; and balance: Ni. Alloy of present invention has increased short-term strength and heat resistance at 1150-12000C, and high-temperature strength at 11500C, and useful in investment casting of products with polycrystalline, directional columnar, and single crystal structure for aircraft, automobile industry, and shipbuilding.

EFFECT: alloy and product made from the same with improved security and increased durability.

2 cl, 2 tbl, 3 ex

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