Nickel alloys, methods of making nickel alloys, articles including the nickel alloys, uses of the alloys, and methods of treating nickel alloys are described. The inventive heat resistant structural materials are suitable for applications requiring high yield stress at room temperature and good creep strength at high temperatures, such as in gas turbines, steam turbines, fossil energy boilers, aero engines, power generation systems using fluids such as supercritical carbon dioxide (e.g., advanced ultra-supercritical power plants), concentrated solar power plants, nuclear power plants, molten salt reactors: turbine blades, casings, valves, heat exchangers and recuperators.

[Problem] The present invention controls the composition of non-metallic inclusions that affect surface properties and provides Ni-based alloys with superior surface properties. [Solution] A Ni-based alloy consisting of: all by mass %, Ni: 52.0% or more, C: 0.001% to 0.030%, Si: 0.01 to 0.10%, Mn: 0.10 to 1.50%, P: 0.030% or less, S: 0.0050% or less, Cr: 13.0 to 25.0%, Mo: 10.0 to 18.0%, W: 1.00 to 5.00%, Cu: 1.00% or less, Co: 3.00% or less, Al: 0.001 to 0.170%, Fe: 2.00 to 8.00%, Mg: 0.0010 to 0.0200%, Ca: 0.0001 to 0.0040%, V: 0.500% or less, Nb: 0.001 to 0.100%, O: 0.0001 to 0.0050%, and balance of inevitable impurities; the alloy comprising non-metallic inclusions, wherein the non-metallic inclusions comprise one or more of MgO, CaO, CaOMgO-based oxides, CaOAl.sub.2O.sub.3MgO-based oxides, and MgO.Math.Al.sub.2O.sub.3, the MgO.Math.Al.sub.2O.sub.3 has a number ratio of 50% or less with respect to all oxide-based non-metallic inclusions.

The present disclosure relates to the technical field of nickel-based superalloys, and in particular to a nickel-based superalloy and preparation method therefor, and a structural component. The alloy includes the following components in mass percentage: Co 17%-22%, Cr 9%-13%, Ta 2.95%-3.95%, Al 2.5%-3.5%, Ti 2.5%-3.5%, W 2.1%-3.5%, Mo 2.1%-3.5%, Nb 1.65%-1.95%, Hf 0.2%-0.7%, C 0.03%-0.08%, B 0.01%-0.06%, Zr 0.03%-0.07% and Ni. The nickel-based superalloys of the present disclosure, in the creep process at 780 C., produces specific Suzuki atmosphere in certain positions, and locks dislocations to improve creep resistance, such that the operating temperature can be raised to more than 780 C., which meets the requirements on the materials for the advanced aero-engines.

A composition of non-metallic inclusions that affect surface properties and provides Ni-based alloys with superior surface properties. A Ni-based alloy consisting of: all by mass %, Ni: 52.0% or more, C: 0.001% to 0.030%, Si: 0.01 to 0.10%, Mn: 0.10 to 1.50%, P: 0.030% or less, S: 0.0050% or less, Cr: 13.0 to 25.0%, Mo: 10.0 to 18.0%, W: 1.00 to 5.00%, Cu: 1.00% or less, Co: 3.00% or less, Al: 0.001 to 0.170%, Fe: 2.00 to 8.00%, Mg: 0.0010 to 0.0200%, Ca: 0.0001 to 0.0040%, V: 0.500% or less, Nb: 0.001 to 0.100%, O: 0.0001 to 0.0050%, wherein the non-metallic inclusions includes one or more of MgO, CaO, CaOMgO-based oxides, CaOAl.sub.2O.sub.3MgO-based oxides, and MgO.Al.sub.2O.sub.3, the MgO.Al.sub.2O.sub.3 has number ratio of 50% or less with all oxide-based non-metallic inclusions.

The present application relates to a dysprosium-rich nickel-tungsten alloy material for nuclear shielding, the composition thereof comprising components of the following mass percentage: C: 0.002-0.02%, W: 5.0-35.0%, Cr: 15.0-30.0%, Dy: 1.0-4.0%, and the remaining components are nickel and unavoidable impurities. A preparation method for the dysprosium-rich nickel-tungsten alloy material for nuclear shielding is also provided. In the present application, a high-dysprosium and high-tungsten nickel-tungsten alloy material is prepared by adding an appropriate ratio of nickel, chromium, tungsten, and dysprosium, and has the advantages of high strength, good plasticity and toughness, corrosion resistance and excellent processing and formability, and can be used as an integrated material of a neutron and photon synergistic shielding functional structure.