141 results about "Laves phase" patented technology

The invention provides a preparation method of a material increase manufactured nickel-based high-temperature alloy reserved with the Laves phase. GH4169 high-temperature alloy with the Laves phase distributed in a dispersed particle shape is prepared through the preparation method, and compared with industrial forged and cast isometric crystal high-temperature alloy, the high-temperature mechanical properties, especially the high-temperature creep property, the high-temperature endurance life and the like are greatly improved. The preparation method comprises the following steps that firstly, in a processing rood, GH4160 high-temperature alloy powder or wire materials are processed through a high-energy beam heat source to be continuously melted and deposited on a base plate, so that the GH4169 high-temperature alloy reserved with the Laves phase is prepared; secondly, the prepared GH4169 high-temperature alloy reserved with the Laves phase is naturally cooled in the processing room and taken out after the temperature of the GH4169 high-temperature alloy is below 100 DEG C; and thirdly, two stages of heat treatment is conducted on the GH4169 high-temperature alloy which is taken out of the processing and reserved with the Laves phase in sequence, the first stage is completed by conducting heat preservation for 8-24 hours under the condition that the GH4169 high-temperature alloy is heated to the temperature of 700-740 DEG C, then the second stage is completed by cooling the GH4169 high-temperature alloy to the temperature below 600-640 DEG C along with a heat preservation furnace and then conducting heat preservation for eight hours, and finally air cooling is conducted till the indoor temperature is reached, so that the material increase manufactured nickel-based high-temperature alloy reserved with the Laves phase is obtained.

The invention relates to a CrMoNbTiZr high-entropy alloy material and a preparation method of the CrMoNbTiZr high-entropy alloy material. The high-entropy alloy material comprises Cr, Mo, Nb, Ti and Zr, wherein the molar ratio of Cr to Mo to Nb to Ti to Zr is 1:1:1:1:1. The preparation method comprises the steps that 1, powder is prepared, and particularly metal powder is prepared according to the equal molar ratio; 2, powder mixing is carried out, and particularly the prepared powder is mixed to be uniform in a V-shaped powder mixing machine; 3, pressing and block forming are carried out, and particularly the mixed powder is subjected to cold pressing under a pressing machine to form blocks; and alloy is molten, and particularly a vacuum non-consumable arc melting furnace is used for melting the samples which are obtained after the powder is pressed to be blocks. The CrMoNbTiZr high-entropy alloy material mainly comprises a BCC solid solution phase and a small amount of Laves phase, meanwhile has the advantages of being high in hardness, high in corrosion resistance and the like, and has the good application prospect in the field of wear resistance and corrosion resistance.

The invention relates to an Nb microalloyed Ni-Co-Fe-Cr-Al high-entropy alloy, and belongs to the technical field of metal materials. According to the Nb microalloyed Ni-Co-Fe-Cr-Al high-entropy alloy, through adjusting of proportioning of basic components of Al, Ni, Co, Cr and Fe and adding of microelement Nb, forming of an L12 phase is promoted, and occurrence of detrimental phases such as a B2phase, an Laves phase and a sigma phase is avoided; the high-entropy alloy is mainly composed of an FCC phase, the grain size is within 100 [mu]m-400 [mu]m, the yield strength is not lower than 300 MPa, the tensile strength is not lower than 740 MPa, the elongation rate is not lower than 18%, the good toughness and the high yield strength are both achieved, and the Nb microalloyed Ni-Co-Fe-Cr-Al high-entropy alloy meets the requirements of a modern industry for mechanical properties of materials.

The invention discloses an under-measurement Laves phase hydrogen storage alloy and a preparation method thereof. The general chemical formula of the alloy is TiuZrxMnvMyVz, wherein x is more than or equal to 0 and is less than or equal to 0.2; y is more than or equal to 0.1 and is less than or equal to 0.4; z is more than or equal to 0.1 and is less than or equal to 0.5, u plus x is equal to 1, and v plus y is equal to 1.5; the optimal range of y is more than or equal to 0.1 and is less than or equal to 0.2, and the optimal range of z is more than or equal to 0.1 and is less than or equal to 0.3; M element can be Cr, Ni or Cu; and the preparation method comprises the following steps: weighing the alloy according to the blending ratio; repeatedly melting block-shaped pure metal in a magnetic suspension high frequency induction furnace under the protection of argon gas for two times to three times; and annealing the obtained cast alloy for six to eight days at the temperature of 950 DEG C to 1050 DEG C under the protection of inert gas. The invention has the advantages of large hydrogen storage amount, small lag, long platform area and other good comprehensive performances.

A Co—Mo—Cr Co-based alloy and overlay for wear and corrosion applications. The Mo:Si ratio is between about 15:1 and about 22:1 for enhanced ductility with a Laves phase.

The present invention provides a martensitic stainless steel in which specified elements in a steel composition are limited. The martensitic stainless steel can have high strength of 0.2% proof stress of 860 MPa or more and excellent carbon dioxide gas corrosion resistance and sulfide stress-corrosion cracking resistance by limiting the steel composition of specified elements and defining Mo content in the steel by relationships with IM values as well as by forming microstructure of the steel with main tempered martensite, carbide precipitated during tempering, and intermetallic compounds such as a Laves phase, a σ phase and the like. As a result the martensitic stainless steels of the present invention can be applied to practical steels, which can be widely used in oil well tubes and the like under environment including carbon dioxide gas, hydrogen sulfide, chlorine ions or two or more of them, in wide fields.

Disclosed is a heat-resistant Ti alloy material excellent in high-temperature corrosion resistance and oxidation resistance, which comprises a base made of a heat-resistant Ti alloy and a surface layer formed on the surface of the base. The surface layer has a multilayer structure including an inner layer and an outer layer. The inner layer has three coexistent phases consisting of a β phase, a γ phase and a Laves phase in the phase diagram of a Ti—Al—Cr based alloy, and the outer layer is made of an Al—Ti—Cr based alloy having an Al concentration of 50 atomic % or more. The heat-resistant Ti alloy material is produced by subjecting a substrate made of a heat-resistant Ti alloy to a Cr diffusion treatment at a temperature within a β single-phase region in the phase diagram of a Ti—Al—Cr based alloy, precipitating a γ phase and a Laves phase from the β phase during a cooling process to form the inner layer with three coexistent phases consisting of the β, γ and Laves phases, and then subjecting the obtained product to an Al diffusion treatment to form the outer layer. The heat-resistant Ti alloy material can prevent the diffusion of Al from the outer layer to the base and the diffusion of elements of the base to the outer layer while forming a protective Al₂O₃ film in a self-repairing manner, to provide excellent high-temperature corrosion resistance and oxidation resistance to the heat-resistant Ti alloy base.

The invention relates to a method for reducing a Laves phase in a nickel-based high-temperature alloy steel ingot. The method comprises the following steps that firstly, the nickel-based high-temperature alloy serves as a mother alloy; secondly, the mother alloy is taken out, and vacuum induction smelting is carried out, after total melting, refining is carried out, at the refining tail period, the vacuum degree is larger than or equal to 3 Pa, a valve is closed, Ar is inflated to 7 to 9 kPa, a ferrovanadium intermediate alloy is added, sufficient stirring and vibrating are carried out, afterfive minutes, the temperature is adjusted to 1470 to 1500 DEG C, slow continuous casting is carried out, discharging is carried out, and the steel ingot is obtained; thirdly, electroslag smelting is carried out, wherein electroslag with the mass percent of CaF2:CaO:Al2O3:MgO being 60:15:20:5 is used; fourthly, homogenizing annealing is 1140 DEG C*24h. The precipitation proportion of the Laves phase in the solidification process of the steel ingot obtained in the method can be obviously reduced, the steel ingot microstructure uniformity can be improved, the steel ingot subsequent homogenizationtreatment difficulty is reduced, and the mechanical property of the nickel-based high-temperature alloy is ensured.

Coatings suitable for use as protective oxide-forming coatings on Nb-based substrates exposed to high temperatures and oxidative environments. The coatings contain chromium and/or molybdenum, preferably contains silicon, and optionally contains niobium, titanium, hafnium, iron, rhenium, tantalum, and/or tungsten, which in combination form multiple intermetallic phases, which in combination form one or more intermetallic phases that promote the formation of a slow-growing oxide scale. Depending on the particular coating composition, the intermetallic phases may be: a silicon-modified Cr₂Nb Laves phase and optionally a chromium solid solution phase, a CrNbSi intermetallic phase, and/or an M₃Si intermetallic phase where M is niobium, titanium, and/or chromium; or M₅Si₃, MSi₂ and/or M₃Si₂ where M is molybdenum, niobium, titanium, chromium, hafnium, iron, rhenium, tantalum, and/or tungsten.

A GH4700 alloy ingot homogenizing treatment method is characterized in that cast-condition alloy is placed into a resistance heated furnace with the temperature lower than 400 DEG C, the temperature is raised to 1130-1150 DEG C at the speed of 100 DEG C/hour, the temperature of 1130-1150 DEG C is kept for 8-10 hours, then the temperature is raised to 1180-1210 DEG C in half an hour, the temperature of 1180-1210 DEG C is kept for 24-32 hours, then the temperature is lowered to 1000 DEG C in a furnace, and the cast-condition alloy is moved out of the furnace to be cooled to room temperature in air. According to the method, Nb and Ti elements of the alloy are made to undergo segregation, the alloy is made to undergo Laves phase elimination, and hot-working plasticity of the alloy is improved.

A Ni—Fe—Cr—Mo alloy containing a small amount of Cu and correlated percentages of Nb, Ti and Al to develop a unique microstructure to produce 145 ksi minimum yield strength. The unique microstructure is obtained by special annealing and age hardening conditions, by virtue of which the alloy has an attractive combination of yield strength, impact strength, ductility, corrosion resistance, thermal stability and formability, and is especially suited for corrosive oil well applications that contain gaseous mixtures of carbon dioxide and hydrogen sulfide. The alloy comprises in weight percent the following: 0-15% Fe, 18-24% Cr, 3-9% Mo, 0.05 3.0% Cu, 3.6-6.5% Nb, 0.5-2.2% Ti, 0.05-1.0% Al, 0.005-0.040% C, balance Ni plus incidental impurities and a ratio of Nb/(Al+Ti) in the range of 2.5-7.5. To facilitate formability, the composition range of the alloy is balanced to be Laves phase free. According to the disclosed method of manufacture, the above alloy is provided and hot worked to a desired shape such as a bar or tube for corrosive oil and gas deep wells. The shaped alloy is heat treated by solution annealing, quenching or air cooling, followed by one or two aging steps to precipitate.y′ and y″ phases.

The invention discloses a Zr-Ti-Cr-V complex phase hydrogen storage alloy and a preparing method thereof. The hydrogen storage alloy is composed of Zr, Ti, Cr and V; the atomic ratio is 1:0.2-0.6:0.1-0.6:1.8-2.1. Through component design of the non-stoichiometric ratio, through vacuum heat treatment, a C15 type Laves phase, V-rich solid solution and Zr-rich solid solution coexistence complex phasestructure with the specific proportion can be formed in the alloy. The alloy room temperature hydrogen absorbing amount can reach 2.80wt%, and the excellent hydrogen absorbing dynamics property can be achieved.

This is to provide a build-up wear-resistant copper-based alloy, which is advantageous for enhancing the cracking resistance and machinability, which is appropriate for cases of building up to form built-up layers especially, and which is equipped with the wear resistance, cracking resistance and machinability combinedly in a well balanced manner. A build-up wear-resistant copper-based alloy is characterized in that it has a composition, which includes nickel: 5.0-20.0%; silicon: 0.5-5.0%; manganese: 3.0-30.0%; and an element, which combines with manganese to form a Laves phase and additionally to form silicide: 3.0-30.0%; by weight %, and inevitable impurities; and additionally the balance being copper. The element can be one member or two or more members of titanium, hafnium, zirconium, vanadium, niobium and tantalum.

The invention discloses the metal alloy nano rods and nano wires which are prepared by a Laves phase hydrogenation method and a technique. The metal alloy nano rods and nano wires are characterized by being a Laves phase alloy of nanometer whisker which can produce simple-substance manganese and the alloy of the manganese. The expression formula of the alloy component is Ti1-xZrx (Mn1-yCry)2; wherein, x is equal to 0 to 1.0; y is equal to 0 to 0.9. The technique is characterized by carrying out hydrogen-charging/dehydrogenation treatment to the alloy for once to ten times, then carrying out ultrasonic vibration treatment to the sample containing little amount of hydrogen after dehydrogenation treatment in ethanol solvent and placing the sample in the air for 12 to 72 hours. The invention has the advantages of being a process technology which leads metals to grow out nanometer whisker automatically at a normal temperature under specific hydrogenation condition. The alloy whisker belongs to nanometer whisker materials and the diameter is less than 100nm; the crystal structure is novel hexagonal structure and the shape is a regular round bar or wire. The alloy whisker has high melting point, high hardness and unique magnetic performance, and is magnetic nano-material.

The invention discloses a multiple-principal-component Laves-base intermetallic compound and a preparation method thereof, belonging to the field of alloy material design. The component element is FeCoNiCrxZr, wherein x is 0.5-1. The principal phase of the multiple-principal-component Laves-base intermetallic compound obtained by arc smelting and heat treatment is a Laves intermetallic compound, or the Laves phase base contains a small amount of bcc-structure solid solution. Due to the high entropic effect and topology structure features of the multiple-principal-component Laves phase, the multiple-principal-component Laves-base intermetallic compound has the advantages of superhigh hardness, superhigh structural stability, superhigh tempering softening resistance and favorable high-temperature aging reinforcement effect, and is applicable to the field of 1100-DEG C-below high-temperature structure materials in industry.

The invention provides a novel nitride-reinforced martensite heat-resisting steel. The steel is characterized in that main alloy components of the martensite heat-resisting steel comprises, by weight, 0.8-1.5% of Mn; 8.0-10.0% of Cr; no more than 1.5% of W; no more than 1.5% of Mo (wherein wherein the sum of the weight percentages of W and Mo is 1.5-2.0%); no more than 0.06% of Nb; no more than 0.15% of Ta (wherein Nb+Ta accounts for 0.05-0.15%); 0.1-0.3% of V; 0.03-0.05% of N; and balance of Fe. According to the invention, the content of the element Mn is increased. On a basis that a phase change point of a material AC1 is almost not reduced, heat-resisting steel original martensite tissues reinforced by high-thermal-stability nitride precipitate is obtained. With the controlling over the contents of elements Co, W, Mo, N, and the like, Laves phase and Z phase precipitation of steel during long-term high-temperature service can be retarded. Therefore, the obtained steel has relatively high tissue stability and good high-temperature mechanical properties.

The soft Cr-containing steel includes, on a % by mass basis, C: from about 0.001% to about 0.020%, Si: more than about 0.10% and less than about 0.50%, Mn: less than about 2.00%, P: less than about 0.060%, S: less than about 0.008%, Cr: from about 12.0% to about 16.0%, Ni: from about 0.05% to about 1.00%, N: less than about 0.020%, Nb: from about 10×(C+N) to about 1.00%, Mo: more than about 0.80% and less than about 3.00%, wherein the contents of alloying elements, represented by Si and Mo, respectively, on a % by mass, satisfy the formula Si≦1.2−0.4Mo, so as to prevent precipitation of the Laves phase and to stably secure an effect of increasing high-temperature strength due to solid solution Mo.

The invention discloses a method for preparing and synthesizing an NbCr2 intermetallic compound porous material through a reaction of Cr powder and Nb powder. The method comprises the steps as follows: 1), the Cr powder and the Nb powder which have the atomic percent of 2:1 and a grinding ball are placed into a ball grinding tank, the tank is sealed, and ball grinding is performed; 2), a proper quantity of a binding agent is added into the fully-mixed powder, and the mixture is pressed into sheet briquettes after uniform mixing; and 3), briquette-pressing is performed, a sectional type sintering process is adopted, and sintering is performed in a vacuum sintering furnace, so that the Cr powder and the Nb powder have a reaction fully, so that the intermetallic compound NbCr2 is formed. According to the method, the Laves-phase NbCr2 intermetallic compound porous material is synthesized, and the porosity of the synthesized porous material reaches 35%-55%.