A method of creating a ductile, work-hardened, nanotwinned, austenite/martensite nano-lamellar nanostructure in an austenite steel alloy. Briefly, raw materials with high-purity are smelted to obtain an as-cast steel alloy ingot, which will be subjected to homogenization and cold-roll treatment for reduction. The homogenized and cold-rolled steel alloy ingot is further recrystallized to eliminate any possible casting defects and form an as-recrystallized steel alloy having a single face-centered cubic structure with recrystallized grains. The as-recrystallized steel alloy is cold-rolled again for forming a nanotwinned austenite structure and for forming martensite lamellae along nanotwin boundaries such that an austenite/martensite nano-lamellar structure in the steel alloy.

The present invention has as its object the provision of an Fe-based amorphous alloy and Fe-based amorphous alloy ribbon excellent in soft magnetic properties having a low iron loss and a high saturation magnetic flux density. The Fe-based amorphous alloy excellent in soft magnetic properties of the present invention comprises, by atom %, B: 8.0% or more and 18.0% or less, Si: 2.0% or more and 9.0% or less, C: 0.10% or more and 5.00% or less, Al: 0.005% or more and 1.50% or less, P: 0% or more and less than 1.00%, Mn: 0% or more and 0.30% or less, Fe: 78.00% or more and 86.00% or less, and balance: impurities and has an amorphous structure.

Disclosed are an amorphous nanocrystalline soft magnetic material, a preparation method therefor and an application thereof, an amorphous ribbon material, an amorphous nanocrystalline ribbon material, and an amorphous nanocrystalline magnetic sheet. The soft magnetic material comprises an amorphous matrix phase, a nanocrystalline phase distributed in the amorphous matrix phase, and fine crystalline particles distributed in the amorphous matrix phase and the nanocrystalline phase. The amorphous matrix phase comprises Fe, Si, and B, the fine crystalline particles comprise metal carbides, and the soft magnetic material comprises Fe, Si, B, P, and Cu.

A grain-oriented electrical steel sheet includes a base steel sheet, an oxide film, and a phosphate-based coating. The phosphate-based coating includes a first crystalline phosphorus oxide whose crystal structure corresponds to Fe.sub.2P.sub.2O.sub.7 and a second crystalline phosphorous oxide whose crystal structure corresponds to Fe.sub.7(P.sub.2O.sub.7).sub.4, and the second crystalline phosphorous oxide includes at least one element selected from a group consisting of V, W, Zr, Co, and Mo.

Disclosed in the present invention is a nanocrystalline soft magnetic alloy with high magnetic induction and high frequency. The nanocrystalline soft magnetic alloy has a molecular formula of Fe.sub.aSi.sub.bB.sub.cMa.sub.dCu.sub.eP.sub.f, in which M includes one or more of Nb, Mo, V, Mn, and Cr, molar percent contents of elements are as follows: 6?b?15, 5?c?12, 0.5?d?3, 0.5?e?1.5, and 0.5?f?3, and the balance includes Fe and impurities. A difference between an induced anisotropy value and an average magnetocrystalline anisotropy value is 0.1-1 J/m.sup.3. The soft magnetic alloy has high magnetic permeability and low magnetic loss at high frequency. Further disclosed in the present disclosure is a method for preparing the nanocrystalline soft magnetic alloy with high magnetic induction and high frequency. Based on a repeated cycle of a thermal field, a transverse magnetic field, and a cold field, the induced anisotropy value (K.sub.u) is similar to the average magnetocrystalline anisotropy value (<K.sub.1>), so that soft magnetic properties at high frequency are improved.

A non-oriented electrical steel sheet containing: in mass%, C: 0.005% or less; Si: 0.1% to 2.0%; Mn: 0.05% to 0.6%; P: 0.100% or less; and Al: 0.5% or less, in which 10 pieces/m.sup.3 or less in number density of non-magnetic precipitate AlN having an average diameter of 10 nm to 200 nm are contained, and an average magnetic flux density B50 in a rolling direction and in a direction perpendicular to rolling is 1.75 T or more. This non-oriented electrical steel sheet can be manufactured by two methods of a method of performing hot rolling annealing at a temperature of 750 C. to an Ac1 transformation point and a method of setting a coil winding temperature to 780 C. or higher and performing self annealing.

A cold-rolled steel plate having favorable heat spot resistance and favorable antiwear performance is provided. The cold-rolled steel plate has a chemical composition containing C from 0.03 to 0.12%, Si from 0 to 1.0% (including a case where Si is not added), Mn from 0.2 to 0.8%, P at 0.03% or less (excluding a case where P is not added), S at 0.03% or less (excluding a case where S is not added), Ti from 0.04 to 0.3%, and Al at 0.05% or less (excluding a case where Al is not added). A residue is formed of Fe and unavoidable impurities. Each element satisfies a relationship of 5*C %Si %+Mn %1.5*Al %<1 within the aforementioned range of the corresponding content. An average diameter of particles of a Ti-based carbide is from 20 to 100 nm. In this way, the Ti-based carbide is dispersed finely and uniformly, thereby enhancing heat spot resistance and antiwear performance.

A thermally treated metal sheet or article as well as processes and systems for making the thermally treated sheet or article is provided. The process comprises heating and/or cooling the metal sheet by non contact thermal conduction for sufficiently long to provide a desired microstructure and mechanical properties. The process results in thermally treated metal sheets.

Methods for use in the manufacture or assembly of an electrical feedthrough to provide a solution to the technical and operational challenges that may arise from use of a high-CTE metal/low-CTE sealing material based assembly or package. In some embodiments, the inventive method includes a thermal tempering and thermal quenching process that is used to create an interfacial layer of the sealing material in which there exists a CTE gradient from sealing material to the metal shell and pin(s). This enables the production of an electrical feedthrough assembly that can tolerate high-CTE mismatch induced mechanical stress over a wide operating temperature range.

An Fe-based amorphous alloy ribbon reduced in iron loss, less deformed, and highly productive in a condition of a magnetic flux density of 1.45 T is provided. One aspect of the present disclosure provides an Fe-based amorphous alloy ribbon having first and second surfaces, and is provided with continuous linear laser irradiation marks on at least the first surface. Each linear laser irradiation mark is formed along a direction orthogonal to a casting direction of the Fe-based amorphous alloy ribbon, and has unevenness on its surface. When the unevenness is evaluated in the casting direction, a height difference HL?width WA calculated from the height difference HL between a highest point and a lowest point in a thickness direction of the Fe-based amorphous alloy ribbon and the width WA which is a length of the linear irradiation mark on the first surface is 6.0 to 180 ?m.sup.2.