Nickel-based superalloy suitable for additive manufacture, a method, and a product includes a special selection of the elements silicon, boron, zirconium, and hafnium. The nickel-based superalloy includes at least the following (in wt.%): carbon (C) 0.04%-0.08% chromium (Cr) 9.8%-10.2% cobalt (Co) 10.3%-10.7% molybdenum (Mo) 0.4%-0.6% tungsten (W) 9.3%-9.7% aluminum (Al) 5.2%-5.7% tantalum (Ta) 1.9%-2.1% boron (B) 0.0025%-0.01% zirconium (Zr) 0.0025%-0.01% hafnium (Hf) 0.1%-0.3%, and optionally yttrium (Y) and residual nickel (Ni).

Provided is an austenitic stainless steel weld joint that is excellent in polythionic acid SCC resistance and naphthenic acid corrosion resistance, and is also excellent in creep ductility. An austenitic stainless steel weld joint includes a base material and a weld metal. The weld metal has a chemical composition at its width-center position and at its thickness-center position consisting of, in mass %, C: 0.050% or less, Si: 0.01 to 1.00%, Mn: 0.01 to 3.00%, P: 0.030% or less, S: 0.015% or less, Cr: 15.0 to 25.0%, Ni: 20.0 to 70.0%, Mo: 1.30 to 10.00%, Nb: 0.05 to 3.00%, N: 0.150% or less, and B: 0.0050% or less, with the balance: Fe and impurities.

A method includes applying a material coating to a surface of a machine component, wherein the material coating is formed from a combination of a hardfacing material, aluminum-containing particles, and a braze material. The method also includes thermally treating the material coating at a temperature to generate an oxide layer comprising aluminum from the aluminum-containing particles, wherein the oxide layer is configured to reduce oxidation of the hardfacing material, and the braze material is configured to facilitate binding between the material coating and the surface of the machine component.

The disclosure describes example techniques and assemblies for joining a first component and a second component. The techniques may include positioning the first and second component adjacent to each other to define a joint region between adjacent portions of the first component and the second component. The techniques may also include inserting a solid retainer material into the joint region through an aperture in one of the first component or the second component to form a mechanical interlock between the first component and the second component and sealing the aperture to retain the solid retainer material within the joint region. The solid retainer material includes at least one of a metal, a metal alloy, or a ceramic.

A process for producing an amorphous ductile brazing foil is provided. According to one example embodiment, the method includes providing a molten mass, and rapidly solidifying the molten mass on a moving cooling surface with a cooling speed of more than approximately 10.sup.5° C./sec to produce an amorphous ductile brazing foil. A process for joining two or more parts is also provided. The process includes inserting a brazing foil between two or more parts to be joined, wherein the parts to be joined have a higher melting temperature than that the brazing foil to form a solder joint and the brazing foil comprises an amorphous, ductile Ni-based brazing foil; heating the solder joint to a temperature above the liquidus temperature of the brazing foil to form a heated solder joint; and cooling the heated solder joint, thereby forming a brazed joint between the parts to be joined.

A method for joining two or more metallic components. The method includes operating a cold-spray apparatus to deposit a feedstock comprising nickel-based alloy particles on a braze region of a first metallic component to form a nickel-containing coating on the braze region. The method also includes brazing the first metallic component and a second metallic component by exposing the braze region to a braze material to form a braze joint that bonds the first metallic component to the second metallic component.

Provided is an austenitic stainless steel weld joint that is excellent in polythionic acid SCC resistance and naphthenic acid corrosion resistance, and is also excellent in creep ductility. An austenitic stainless steel weld joint includes a base material and a weld metal. The weld metal has a chemical composition at its width-center position and at its thickness-center position consisting of, in mass %, C: 0.050% or less, Si: 0.01 to 1.00%, Mn: 0.01 to 3.00%, P: 0.030% or less, S: 0.015% or less, Cr: 15.0 to 25.0%, Ni: 20.0 to 70.0%, Mo: 1.30 to 10.00%, Nb: 0.05 to 3.00%, N: 0.150% or less, and B: 0.0050% or less, with the balance: Fe and impurities.

A welding filler material includes (in wt.-%): C 0.01-0.05%; N 0.05-0.10%; Cr 20.0-23.0 %; Mn 0.25-0.50 %; Si 0.04-0.10 %; Mo 8.0-10.5 %; Ti 0.75-1.0 %; Nb 3.0-5.0%; Fe max. 1.5%; Al 0.03-0.50%; W 4.0-5.0%; Ta max. 0.5%; Co max. 1.0%; Zr 0.10-0.70% Ni remainder; and impurities resulting from the smelting process.

A method for repairing a component is provided, including the following steps: introducing a recess into the component, via which recess a damaged region in the component is removed; positioning a filler body in the recess; and fixedly, i.e. non-detachably, connecting the filler body to the component, wherein the filler body is provisionally secured to the component prior to establishing the fixed connection to the component, in that a securing element is placed over the filler body and the securing element is attached to the component, wherein the securing element is removed again after the establishing of the fixed connection between the filler body and the component.

A multi component braze filler alloy is described having a melting temperature less than about 1235 deg. C. and greater than about 1150 deg. C. This alloy can be processed by hot isostatic pressing (HIP) at a temperature above about 1065 deg. C. and is particularly suited for the repair of gas turbine blades and vanes, especially those made from Alloy 247. The relatively low Ti content in the present braze alloy tends to form less MC carbides at the joint interface, particularly in comparison with other braze alloys high in Zr and/or Hf. Processes for employing this braze filler alloy in processing of nickel-base superalloys, especially Alloy 247, are presented.