Abstract:
In order to provide austenitic single crystal stainless steel having preferable stress corrosion cracking resistance, strength, and irradiation induced embrittlement resistance so as to extend life of nuclear reactor core structure which is used under a high radiation dose environment, a method is disclosed, which comprises the steps of homogeneously dispersing carbides into a parent phase of the austenitic single crystal stainless steel by a two step solution heat treatment, and subsequent an ageing heat treatment after rapid cooling for precipitating fine carbides.
Abstract:
The invention relates to a method for manufacturing a component, especially of a gas turbine, made of a single crystal (SX) or directionally solidified (DS) nickelbase superalloy, comprising a heat treatment (HTS1-3) and a machining and / or mechanical treatment step (S M ). The ductility of the component is improved by doing said machining and / or mechanical treatment step (S M ) prior to said heat treatment (HTS1-3) and a solution heat treatment (SHT) of the component (11) is done prior to said machining/mechanical treatment step (SM).
Abstract:
The invention relates to a light source, in particular, an incandescent lamp, which comprises a tube (2) and a filament (1) which can be heated and is arranged in the tube (2). The light source is embodied in such a manner that the operating life thereof and of the filament (1) is extended. As a result the filament (1 ) consists at least partially of monocrystalline filament material. The invention also relates to a filament (1) for the above-mentioned light source. The invention further relates to a method for producing a monocrystalline metal wire, in particular a filament (1) for a light source and a metal raw wire which is used as an initial material. According to said method, the raw wire is subjected, at least sectionally, to zone crystallisation which leads to the formation of an essentially monocrystalline metal structure.
Abstract:
A method of making body centered cubic metal sheets and foils as thin as 10 microns in thickness, and the single crystal sheets formed therefrom are disclosed. The method includes manufacturing billets of right-angled cross sections from the single crystal from refractory metals, such as tungsten, molybdenum and niobium, deforming the billets by reductions per pass of 1-2 %, e.g. by rolling, and subsequently high temperature vacuum annealing for about 10 to 15 minutes. The billets used in rolling are characterized by a homogenous distribution of dislocations, by the availability of the blocks more than 15 microns in size, and by the misorientation angles of the block sub-boundaries of less than 30 DEG . The yield is enhanced and a stable structure is obtained by incorporating single crystal sampling and billet structural condition diagnostics into the method.
Abstract:
Problem To provide a heat resistant metal gasket that is controlled to have a strength level (ordinary temperature hardness) capable of facilitating processing, and has excellent gas leak resistance. Solution An austenitic stainless steel sheet for a metal gasket, having a chemical composition containing from 0.015 to 0.200% of C, from 1.50 to 5.00% of Si, from 0.30 to 2.50% of Mn, from 7.0 to 17.0% of Ni, from 13.0 to 23.0% of Cr, and from 0.005 to 0.250% of N, all in terms of percentage by mass, containing, as necessary, at least one of Mo, Cu, Nb, Ti, V, Zr, W, Co, B, Al, REM (rare-earth element except for Y), Y, Ca and Mg, with the balance of Fe and unavoidable impurities, having an ordinary temperature hardness of 430 HV or less, having a half width of a peak of an austenite crystal (311) plane in an X-ray diffraction pattern of a cross section perpendicular to a sheet thickness direction of from 0.10 to 1.60°, and having a surface roughness Ra of 0.30 µm or less.
Abstract:
A method to limit surface zone recrystallization in a superalloy article (20) includes limiting recrystallization in a surface zone (34) of a superalloy article by treating the superalloy article in an oxygen-containing environment to introduce oxygen into the surface zone in an amount sufficient to pin any new grain boundaries in the surface zone.
Abstract:
A biaxially textured alloy article includes a rolled and annealed biaxially textured base metal substrate characterized by an x-ray diffraction phi scan peak of no more than 20 DEG FWHM; and a biaxially textured layer of an alloy or another material on a surface thereof. The article further includes at least one of an electromagnetic device or an electro-optical device epitaxially joined to the alloy.