Abstract: A high-strength hot-rolled steel sheet for an electric resistance welded steel pipe has decreased variations in in-plane material properties, high strength, and excellent ductility. The high-strength hot-rolled steel sheet has a composition containing, in mass %, C: 0.10 to 0.18%, Si: 0.1 to 0.5%, Mn: 0.8 to 2.0%, P: 0.001 to 0.020%, S: 0.005% or less, Al: 0.001 to 0.1%, Cr: 0.4 to 1.0%, Cu: 0.1 to 0.5%, Ni: 0.01 to 0.4%, Nb: 0.01 to 0.07%, N: 0.008% or less, and further Mo: 0.5% or less and/or V: 0.1% or less so that Moeq defined as Moeq=Mo+0.36Cr+0.77Mn+0.07Ni is 1.4 to 2.2, and Mo and V are contained to satisfy 0.05?Mo+V?0.5; and has a microstructure containing, in volume fraction, 80% or more of a bainite phase as a primary phase and 4 to 20% of a martensite phase and a retained austenite phase in total as a secondary phase, where the bainite phase has an average grain size of 1 to 10 ?m.

Abstract: An integrated method for manufacturing a high-temperature resistant thin-walled component by preforming by laying a metal foil strip. The integrated manufacturing method includes: designing a preform, preparing a support die, determining a thickness of a foil strip, determining a width of the foil strip, developing a laying process, laying an A foil strip and a B foil strip, obtaining an AB laminated preform, bulging the preform, performing a reactive synthesis and a densification process of a bulged component, and performing a subsequent treatment of the thin-walled component. Various embodiments obtain an integral thin-walled preform with a complex structure, a uniform wall thickness and a shape close to the final part by continuously laying a metal foil strip with an appropriate width.

Abstract: A method of printing a three dimensional article (201) can include forming a bottom layer of the three dimensional article (201) by spraying a dry build material powder (210) onto a build platform (230) while heating the dry build material powder (210). The dry build material powder (210) can include metal or ceramic particles mixed with a polymeric binder having a softening point temperature. The dry build material powder (210) can be heated to a temperature above the softening point temperature such that the dry build material powder (210) adheres to the build platform (230). Subsequent layers can be formed by spraying dry build material powder (210) onto a lower layer while heating the dry build material powder (210) such that the dry build material powder (210) adheres to the lower layer.

Abstract: The high-strength seamless steel pipe has a volume fraction of tempered martensite of 95% or more, and a prior austenite size number of 8.5 or more, and contains nitride inclusions having a size of 4 ?m or more and whose number is 100 or less per 100 mm2, nitride inclusions having a size of less than 4 ?m and whose number is 700 or less per 100 mm2, oxide inclusions having a size of 4 ?m or more and whose number is 60 or less per 100 mm2, and oxide inclusions having a size of less than 4 ?m and whose number is 500 or less per 100 mm2, in a cross section perpendicular to a rolling direction.

Abstract: The invention relates to gamma, gamma'-cobalt-based alloys for additive manufacturing methods or soldering, welding, powder and component. By using a cobalt-based alloy based on Co-7W-7 Al-23Ni-2Ti-2Ta-12Cr-0.0IB-0.IC-(0-0.1Si), an alloy that is especially well-suited for additive manufacturing methods or high-temperature soldering is proposed.

Abstract: Disclosed herein, in certain embodiments, are composite materials, methods, tools and abrasive materials comprising a tungsten-based metal composition, a tungsten carbide, and an alloy. In some cases, the composite materials or matrix are resistant to oxidation.

Abstract: A Fe-based nanocrystalline alloy powder having an alloy composition represented by the following Composition Formula (1) and having an alloy structure including nanocrystal particles: Fe100-a-b-c-d-e-f-gCuaSibBcModCreCfNbg ??Composition Formula (1), in which 100-a-b-c-d-e-f-g, a, b, c, d, e, f, and g each represent a percent (%) by atom of a relevant element, and a, b, c, d, e, f, and g satisfy 0.10?a?1.10, 13.00?b?16.00, 7.00?c?12.00, 0.50?d?5.00, 0.001?e?1.50, 0.05?f?0.40, and 0?(g/(d+g))?0.50, in Composition Formula (1).

Abstract: A nickel-titanium alloy is made to be wholly or substantially free of titanium-rich oxide inclusions by including yttrium in an amount up to 0.15 wt. %, with the balance of the alloy being nickel and titanium in approximately equal proportion. For example, a NiTiY alloy may have a composition including, in weight percent based on total alloy weight: between 50 and 60 wt. % nickel; between 40 and 50 wt. % titanium; and between 0.01 and 0.15 wt. % yttrium. The resulting alloy is capable of being drawn into various forms, e.g., fine medical-grade wire, without exhibiting an unacceptable tendency to develop surface defects or to fracture or crack during cold drawing or forging. The resulting final forms exhibit favorable fatigue strength and fatigue-resistant characteristics.

Abstract: A method comprises providing a molten aluminum alloy selected from the group consisting of 6000 series aluminum alloys. The molten aluminum alloy is formed into a formed body having beta-AlFeSi particles. The formed body is solution heat treated at a temperature in a range of 1,025-1,070° F. to form a heat treated body. The solution heat treating transforms substantially all of the beta-AlFeSi particles into alpha-AlFeSi particles such that the heat treated body is substantially free of the beta-AlFeSi particles.

Abstract: A method comprises providing a molten aluminum alloy selected from the group consisting of 6000 series aluminum alloys. The molten aluminum alloy is formed into a formed body having beta-AlFeSi particles. The formed body is solution heat treated at a temperature in a range of 1,025-1,070° F. to form a heat treated body. The solution heat treating transforms substantially all of the beta-AlFeSi particles into alpha-AlFeSi particles such that the heat treated body is substantially free of the beta-AlFeSi particles.

Abstract: An object of the invention is to provide: an alloy article that has excellent homogeneity in the alloy composition and microstructure as well as significant shape controllability, using an HEA with significant mechanical strength and high corrosion resistance; a method for manufacturing the alloy article; and a product using the alloy article. There is provided an alloy article comprising: Co, Cr, Fe, Ni, and Ti elements, each element in content of 5 to 35 atomic %; more than 0 atomic % to 8 atomic % of Mo %; and remainder substances of unavoidable impurities. And, ultrafine particles with an average diameter of 40 nm or less are dispersedly precipitated in matrix phase crystals of the alloy article.

Abstract: A method to reduce corrosion rates of materials at high temperatures may include heating a mixture and applying the heated mixture to a material to be rendered thermodynamically noble. The mixture may include carbon monoxide and carbon dioxide and the material rendered thermodynamically noble may include copper or other material having similar physical properties. The copper or other similar material may be applied to a structural material and provide a surface interfacing with the mixture of carbon monoxide and carbon dioxide to prevent corrosion of the structural material. In some cases, the structural material may form a heat exchanger defining passageways for a working fluid of a power system and/or may form other passageways of the power system. The copper may be applied to the passageways as a protective coating and then made thermodynamically noble at high temperatures after interactions with the mixture of carbon monoxide and carbon dioxide.

Abstract: Some variations provide a process for additive manufacturing of a nanofunctionalized metal alloy, comprising: providing a nanofunctionalized metal precursor containing metals and grain-refining nanoparticles; exposing a first amount of the nanofunctionalized metal precursor to an energy source for melting the precursor, thereby generating a first melt layer; solidifying the first melt layer, thereby generating a first solid layer; and repeating many times to generate a plurality of solid layers in an additive-manufacturing build direction. The additively manufactured, nanofunctionalized metal alloy has a microstructure with equiaxed grains.

Abstract: In one or more first regions of a steel component, a primarily austenitic microstructure can be produced from which a mainly martensitic microstructure can be brought about through a quenching process. In one or more second regions of the component, a mainly ferritic-pearlitic microstructure can be brought about. In one or more third regions, a mainly bainitic microstructure can be brought about. The component is first heated to a temperature below the AC3 temperature in a first furnace, and transferred into a treatment station. The component can be cooled during the transfer. In the treatment station, the first and third regions are brought to a temperature above the austenitization temperature. Only the third regions are cooled to a cooling stop temperature ?s. The component is transferred into a second furnace, with a temperature lying below the AC3 temperature. There, the temperatures of the three different regions approximate one another.

Abstract: The steel pipe of the present invention is a low alloy high strength seamless steel pipe for oil country tubular goods including a composition containing, in terms of mass %, C: 0.23 to 0.27%, Si: 0.01 to 0.35%, Mn: 0.45 to 0.70%, P: 0.010% or less, S: 0.001% or less, O: 0.0015% or less, Al: 0.015 to 0.080%, Cu: 0.02 to 0.09%, Cr: 0.8 to 1.5%, Mo: 0.5 to 1.0%, Nb: 0.02 to 0.05%, B: 0.0015 to 0.0030%, Ti: 0.005 to 0.020%, and N: 0.005% or less, and having a ratio of the Ti content to the N content (Ti/N) of 3.0 to 4.0, with the balance being Fe and inevitable impurities, the steel pipe having a ratio of a stress at a strain of 0.7% to a stress at a strain of 0.4% in a stress-strain curve of 1.02 or less and a yield strength of 655 MPa or more.

Abstract: Composites comprising various fractions of ultra coarse (UC) tungsten carbide (WC) and cast carbide (CC), along with composites comprising fractions of UC-WC and CC having various particle size and showing an improved strength and erosion resistance, and methods for making the inventive composites.

Abstract: A method of charging a pre-packaged charge in a metallurgical or refining furnace includes providing a disposable metal container having at least one attachment member and forming a pre-packaged charge by loading scrap material into the metal container. The method also includes releasably coupling the at least one attachment member of the container to a lifting device, and then de-coupling the pre-packaged charge from the lifting device so that the combination of the scrap material and the disposable metal container are charged in the furnace.

Abstract: A method for producing a powder-metallurgical product may include providing a powder mixture, forming the powder mixture into a green body, and sintering the green body to form a resulting powder-metallurgical product. The powder mixture may include a first hard phase, a second hard phase, 0 to 1.8% by weight of graphite, 0 to 5% by weight each of cobalt, tri-iron phosphide, copper, bronze, phosphorous, sulphur, calcium fluoride and molybdenum, 0.1 to 1.8% by weight of a pressing aid and a flow improver, and a remaining proportion that is an iron-base powder. The first hard phase may include 52 to 78% by weight of molybdenum, 0 to 2% by weight of silicon, 0 to 1.5% by weight of copper, and a remaining weight proportion of iron and production-related contaminations. The second hard phase may include 0 to 0.8% by weight of manganese and less than 0.1% by weight of carbon.

Abstract: A method is provided for preventing cracking along the surface at the inner hole of a hollow shaft during water quenching, including: a step of water-quenching the inner hole of the shaft placed horizontally, while the outer circle of the shaft is in a state of air cooling, in which the cooling time of the outer circle is selected to be not lower than its Ar1 temperature so as to induce a compressive stress in the surface layer of the inner hole; and a step of water-quenching the outer circle and the inner hole of the shaft simultaneously, moreover, the quenching intensity of the inner hole is gradually reduced to cause a temperature rise in the surface layer of the inner hole to allow martensite in the surface layer to undergo self-tempering, which prevents the formation of quenching cracks along the surface of the inner hole.

Abstract: A high-strength steel sheet exhibiting excellent ductility and stretch-flangeability, and a method for manufacturing such a high-strength steel sheet. The high-strength steel sheet has a chemical composition including specific proportions of components in which C/Mn is 0.08 to 0.20, the balance being iron and inevitable impurities, and includes microstructures including, in terms of area fraction relative to all the microstructures, 40% to 70% total of ferrite and bainitic ferrite, 5% to 35% martensite and 5% to 30% retained austenite. The proportion of martensite (including retained austenite) adjacent to bainitic ferrite is not less than 60% of all martensite (including retained austenite). The proportion of 4.0 GPa and smaller differences in microhardness measured at 0.5 ?m intervals is not less than 70%. The proportion of microstructures with 8.0 GPa or smaller microhardness is not less than 85% of all the microstructures.