74results about How to "Reduce stacking fault energy" patented technology

The invention discloses a high-performance high-entropy alloy and a processing method thereof. Certain content of an element carbon is added into a Fe40Mn40Co10Cr10 alloy to form an interstitial solid solution with a basal body, so that stacking fault energy of the material can be effectively reduced, twin crystals can be induced under the room-temperature condition, and extra strength increment is provided for the basal body by performing solid solution and separating carbides through the element carbon. The element carbon is used as a good interstitial atom and the carbide is used as an effective precipitation strength phase; heat preservation is performed for a relatively long time at a relatively high temperature in the last step, an as-forged microstructure is partly or completely eliminated, and part of the precipitated phase is dissolved to form a nearly single phase structure, so that the alloy has relatively great performance controllable space again on the basis of higher performance level, further strengthening is favorably performed through other strengthening ways such as deformation strengthening and precipitation strengthening to obtain more reasonable strength and plasticity match; and moreover, content of overall alloy elements is reasonable, cost is low, and economical efficiency is relatively strong.

The invention provides a cobalt-based high-temperature alloy wire which is prepared from the following chemical components in percent by mass: 0.06-0.12% of C, less than or equal to 0.3% of Si, 1-1.8%of Mn, less than or equal to 0.015% of P, less than or equal to 0.015% of S, 19.2-20% of Cr, 9.5-10.5% of Ni, 14.2-15.5% of W, less than or equal to 2.8% of Fe, less than or equal to 0.4% of other impurities and the balance Co. By adding 19.2-20% of Cr, the cobalt-based high-temperature alloy wire has excellent corrosion resistance, and a condition that high-temperature strength is decreased as aresult of a double phase area as the content of Cr is too high to promote generation of an epsilon-Co phase and a sigma phase is avoided. Elements such as massive Co, 14.2-15.5% of W and 19.2-20% ofCr and the like in the cobalt-based alloy can reduce stacking fault energy, so that the high-temperature strength of the alloy is improved. The content of W is controlled at 19.2-20%, so that it is ensured that a condition of prominent work hardening of the alloy, difficulty in cold processing and poor stability as the too high W content is avoided. As the cobalt-based high-temperature alloy wirecontains 9.5-10.5% of Ni, the tissue stability of the alloy is improved favorably, and precipitation of a Co7W6 phase is reduced. By adding 1.1-1.8% of Mn, the oxidation resistance of a Ni-Cr alloy isimproved effectively.

The invention discloses a manufacturing method of a silver tin oxide contact alloy material and a manufactured alloy thereof. The method comprises the following steps: 1.smelting: smelting the ingredients at the preset temperature and continuing to stir in the process of smelting; 2. casting the ingredients into a round spindle and lathing the surface of the round spindle; 3. carrying out hot rolling and then cold rolling on the round spindle and then rolling the round spindle into sheets; 4. carrying out oxygenation processing on the sheets in an internal oxidation furnace; 5. crushing the sheets and then carrying out high energy crushing processing on the crushed sheets; 6. carrying out hot extrusion to obtain a wire stock blank; 7. carrying out drawing processing and annealing treatment; and 8. taking the obtained material as the finished product. The alloy comprises the following components in percentage by weight: 7%-9% of Sn, 1.0%-3.0% of rare earth additive and the balance of Ag. The invention has the advantages of more simplified technique, easy implementation and excellent product performance.

The invention discloses a nickel iron based welding wire for a boiler of a 700 DEG C ultra-supercritical power station, and belongs to the field of welding materials of ultra-supercritical power stations. The nickel iron based welding wire is prepared through the following components in percentage by mass: 23-30% of Fe, 19-24% of Cr, 1.8-2.4% of Al, 2.0-2.5% of Ti, 3.0-5.2% of Mo, less than 0.4% of W, not greater than 0.15% of Si, 0.4-0.8% of Mn, 0.04-0.07% of C, 0.001-0.003% of B, not greater than 0.02% of Zr, and the balance Ni, wherein Ti/ Al is not less than 1; the sum of other impure elements is less than 0.1%. According to the nickel iron based welding wire, a weld joint can be microalloyed after welding through TIG (argon tungsten-arc welding), and thus the obtained weld joint meetsthe standard requirement; a weld joint area substrate formed by the nickel iron based welding wire is an austenite (gamma) phase of an irregular surface-core structure; the precipitate reinforcing phase is gamma' (Ni3(Al, Ti)) phase; and carbide phases are distributed among crystals.

The invention belongs to the field of metal additive manufacturing, and particularly discloses a crack-free nickel-based superalloy and a component design method and a preparation method thereof. The crack-free nickel-based superalloy comprises the following components in percentage by mass: 10.50%-11.00% of Mo, 24.50%-25.30% of Cr, 1.00%-1.50% of W, 4.00%-4.50% of Co, 10.00%-11.00% of Fe, 0.05%-0.08% of C, 0.60%-0.80% of Mn, 0-0.30% of Si and the balance of Ni. According to the nickel-based superalloy, the rapid solidification effect of the selective laser melting forming technology can be fully utilized, the strength of the GH3536 alloy can be remarkably improved, meanwhile, the microcrack defect of a traditional nickel-based superalloy in the selective laser melting forming process is remarkably reduced, and the mechanical property is excellent.

The invention discloses a high-forming nitrogen-containing austenitic stainless steel and a manufacturing method thereof. The composition of the steel comprises the following components of, by weight,0.001-0.05% of C, 2.50-3.80% of Si, 6.0-8.0% of Mn, 13.5-15.0% of Cr, 1.0-2.5% of Ni, 0.12-0.15% of N, 3.5-5.0% of Cu, less than or equal to 0.004% of S, 0.1-0.2% of V, 0.1-0.2% of Nb, and the balance Fe and inevitable impurities, wherein C+N is less than or equal to 0.18% , (V + Nb)/C is larger than or equal to 5, the content of Si multiplied by 5.59 mJ/m<2> is greater than or equal to 14 mJ/m<2>, Md30/50 is 40-70 DEG C, the average grain size is larger than or equal to 90 microns, and the hardness is less than or equal to HV180. According to the preparation method disclosed by the invention, the Ni is replaced with nitrogen alloying, and the Mn, the Cu and the like which obtain austenite structures are added; the Si and the like are added, so that lower stacking fault energy is remarkably reduced; the initial hardness of a material is reduced, and the temperature of the MD30/50 is controlled, so that the martensite phase changes slowly in the strain process; the erishen value is larger than or equal to 14.5, LDR is larger than or equal to 2.4, the requirements of complex forming is met, and the performance is close to 304 DDQ with high forming and high cost, so that the steel can be widely applied to industries such as electronics, instruments and apparatus, products and the like.

The invention provides a preparation method of a layered double-scale magnesium alloy, and belongs to the field of light metal material processing. The method comprises the following steps that isothermal heating is carried out on a magnesium alloy plate blank subjected to heating homogenization at 280-370 DEG C for 20-30 min, then the first pass of rolling deformation is immediately carried out to obtain a deformed plate, wherein the strain rate of rolling is 3.5-4.9s<-1>; and after annealing is carried out on the deformed plate, the second pass of rolling deformation is carried out at 280-340 DEG C, wherein the strain rate of rolling is 6.0-7.1s<-1>. According to the preparation method of the layered double-scale magnesium alloy, the high strain rate and gradient cooling double-pass rolling are adopted so that the high-strength toughened magnesium alloy material with the layered double-scale organizational structure can be obtained, the alternate layered distribution of the ultra-fine crystal layer and the micron crystal layer is achieved, and the strength and the plastic toughness of the magnesium alloy are improved.

The invention relates to a high-work-hardening magnesium alloy and a preparation method thereof, which belong to the field of metal materials. The alloy comprises the following chemical components in percentage by mass: 2.3-4.5 percent of tin, 0.1-3.85 percent of zinc and the balance of magnesium and unavoidable impurities; the magnesium alloy can further comprise one or more of 0.01-2.0 percent by mass of silicon, 0.01-3.0 percent of antimony, 0.01-3.0 percent by mass of tellurium, 0.01-1.5 percent by mass of strontium, 0.01-2.0 percent by mass of manganese and 0.01-3.0 percent by mass of rare earth elements; and the rare-earth elements include neodymium, lanthanum, yttrium and cerium. The preparation method comprises the following steps of: melting magnesium, adding tin and zinc, and adding additive elements and rare earth elements; and blowing, stirring, refining, removing slag, standing, directly pouring a melt into an ingot, and thermally extruding into a tubular product, a section or a plate. The alloy has the advantages of high-work-hardening capability, high plastic molding, simple and reliable preparation process, easiness for popularizing and application, and the like.

A Co—Ni-base alloy, being characterized in that a composition of the alloy comprises at least Co, Ni, Cr, Mo, W and Fe, and percentages by weight of the composition are from 25% to 45% of Co, from 25% to 40% of Ni, from 18% to 26% of Cr, from 3% to 11% of Mo, from 0.5% to 9% of W, wherein a sum of Mo and W is from 4% to 13% by weight, and from 1.1% to 5% of Fe.

The invention provides a nickel-based alloy, a preparation method and an article thereof. The nickel-based alloy is composed of the following elements of, 5.25wt%-6.2wt% of aluminum; 5.0wt%-7.0wt% ofchromium; 5.0wt%-7.0wt% of cobalt; 0.5wt%-2.5wt% of molybdenum; 7.0wt%-9.0wt% of tungsten; 0.0 wt%-1.0 wt% of titanium; 7.0 wt%-9. 0wt% of tantalum; 0.0wt% -0.25 wt% of hafnium; 0.0wt%-0.05wt% of carbon; 0.0wt%-0.01 wt% of boron, and the balance nickel. By adding the elements and adjusting the content of the elements, the obtained nickel-based alloy is in the alloy density, the alloy cost, the structure stability, the high-temperature strength and the like are well balanced, and the comprehensive performance is excellent.

The invention discloses a low-temperature, high-strength and high-toughness high-entropy alloy and machining method thereof. The molecular formula of a mother alloy of the high-entropy alloy is (Fe40Mn40Co10Cr10)100-x-yCxTiy, wherein, x is carbon content, and x is larger than 0.6 wt% and smaller than or equal to 0.8 wt%; y is titanium content, and y is greater than 1.4 wt% and less than or equal to 2.4 wt%; According to the percentage composition of element atoms, an alloy matrix Fe40Mn40Co10Cr10 of the high-entropy alloy comprises Fe of 35-45%; Mn of 35-45%; Co of 5-15%; and Cr of 5-15%. According to the low-temperature, high-strength high-toughness high-entropy alloy, a certain content of carbon element and titanium element are introduced into the Fe40Mn40Co10Cr10 alloy to form an interstitial solid solution with a matrix, so that on one hand, the stacking fault energy of a material can be effectively reduced, and twinning can be induced under a low-temperature condition, and on theother hand, the carbon element and the titanium element can provide additional strength increment for the matrix through solid solution and precipitation of carbide and titanium compounds, so that thelow-temperature performance of the material is effectively improved; and the titanium element is used as a good interstitial atom and the titanium compound is used as an effective precipitation strengthening phase, so that the performance of the material at low temperature can be greatly improved.

The invention provides a casting magnesium alloy comprising the components: 0.8-2wt% of Zn, 0.2-0.6wt% of Zr, 0.05-0.55wt% of RE and the balance of Mg and unavoidable impurities, wherein RE is Yb or Y. An Mg-Zn-Zr casting magnesium alloy is modified by Yb or Y with a relatively large atomic radius in a heavy rare earth element, and due to the addition of trace Yb or Y, not only is a relatively high solid solution strengthening effect generated, but also the stacking fault energy of the magnesium alloy can also be reduced; and the reduction of the stacking fault energy is beneficial to the activation of nonbasal slip and the promotion of formation of twin crystals and stacking faults, and furthermore, the plasticity and work hardening capacity of the magnesium alloy are improved. Therefore, the casting magnesium alloy obtained under the combined actions of various components and component contents has relatively high plasticity. The invention also provides a preparation method of the casting magnesium alloy.

The invention provides a nickel base alloy, a preparation method of the nickel base alloy and manufactured goods. The nickel base alloy is prepared from the following elements in percentage by weight:5.5%-6.5% of aluminum, 5.0%-7.0% of chrome, 5.0%-7.0% of cobalt, 5.5%-7.5% of molybdenum, 3.0%-5.0% of tungsten, 0.0%-1.0% of titanium, 6.0%-8.0% of tantalum, 0.0%-0.25% of hafnium, 0.0%-0.05% of carbon, 0.0%-0.01% of boron, and the balance of nickel. According to the nickel base alloy, the preparation method of the nickel base alloy and the manufactured goods, by adding the elements and adjusting the content of the elements, the obtained nickel base alloy realizes good balance in aspects such as alloy density, alloy cost, structure stability and high-temperature strength, and has excellent comprehensive performance.

The invention relates to a deformed high-temperature alloy and a manufacturing method thereof, and relates to the technical field of metal structure materials. According to the mainly adopted technical scheme, the deformed high-temperature alloy comprises the following components in percentage by weight: 20-35% of Co, 8-11% of Cr, 5.2-6% of Ti, 1.8-4.0% of Al, 4-6% of W, 2-4% of Mo, 0-4% of Ta, less than 0.05% of C, less than 0.1% of Zr and the balance of Ni. The stacking fault energy of the deformed high-temperature alloy is less than 33mJ/m < 2 >; and the volume fraction of the strengtheningphase gamma' in the deformed high-temperature alloy is 40-48%. The invention is mainly used for designing the deformed high-temperature alloy which has excellent strength at a use temperature and hasgood plasticity in a hot working temperature interval; and the deformed high-temperature alloy is mainly suitable for parts used under high temperature and high stress, such as turbine discs of aero-engines.

The invention relates to high-strength high-plasticity shape memory steel of which the recovery stress is higher than 500 MPa and the recovery strain is higher than 4%, and a preparation method thereof. Alloy comprises the components of, by mass percent, 18-24% of Mn, 4.5-6.5% of Si, 7-11% of Cr, 4-6% of Ni, 0.08-1.5% of V, 0.02-0.3% of C and the balance Fe. The preparation method of the alloy comprises the steps of vacuum induction smelting and heat treatment, and a preparation technology is simple and controllable. According to the shape memory steel obtained by optimizing the components ofthe alloy, under the condition free of heat mechanical treatment, the recovery stress is higher than 500 MPa, the recovery strain is higher than 4%, the strength is higher than 700 MPa, the elongationpercentage is larger than 10%, and the excellent shape memory effect and mechanical property are embodied.

The invention provides a high-damping high-strength high-entropy alloy material with high corrosion resistance and a preparation method of the high-damping high-strength high-entropy alloy material. The high-entropy alloy material is prepared from the following metal raw materials in percentage by atomic number: 20% of manganese, 15% of chromium, 5-20% of cobalt and the balance of iron. The preparation method of the high-entropy alloy material comprises the following steps that manganese particles, chromium particles, cobalt particles and iron particles are weighted according to the atomic percentage content of manganese, chromium, cobalt and iron in the metal raw materials of the high-entropy alloy material; the weighed manganese particles, chromium particles, cobalt particles and iron particles are put into a vacuum induction furnace, the vacuum induction furnace is vacuumized, repeated overturning smelting is conducted under protective gas, and alloy liquid is obtained; the obtained alloy liquid is subjected to heat preservation treatment in the vacuum induction furnace; and the alloy liquid subjected to heat preservation is cast to obtain an alloy ingot. The high-entropy alloy material has excellent damping property, mechanical property and corrosion resistance at the same time.