Abstract:
Höherfester, kaltumformbarer Stahl und ein aus einem solchen Stahl hergestelltes Stahlflachprodukt, bei denen eine optimale Kombination aus Schweißbarkeit und geringer Neigung zur verzögerten Bildung von Rissen bei guter Festigkeit, Warm- und Kaltverformbarkeit gesichert ist. Um dies zu erreichen, enthält ein erfindungsgemäßer Stahl (in Gew.-%) C: 0,1-1,0 %, Mn: 10-25 %, Si: bis zu 0,5 %, Al: 0,3-2 %, Cr: 1,5-3,5 %, S:
Abstract:
The invention relates to a method by means of which an easily deformable flat steel product having a carbon content of 0.1-0.4 wt % can be produced in a cost-effective manner. To this end, according to the invention, an annealing treatment is carried out under an annealing atmosphere comprising 0.1-25 vol % of H2, H2O, with the remainder being N2 and technically unavoidable impurities, and having a dew point of between -20°C and +60°C, wherein the ratio of H2O/H2 of the annealing atmosphere is no greater than 0.957. The flat steel product is thereby heated to a holding temperature of 600-1100°C in the course of the annealing treatment, at which it is held for a holding time of 10-360 s, so that the flat steel product obtained after the annealing treatment comprises a 10-200 µm thick ductile edge layer (R) adjacent to the free surface thereof, having a ductility that is greater than the interior core layer (K) of the flat steel product covered by the edge layer. The invention further relates to a correspondingly produced flat steel product particularly suitable for hot or cold forming, and to a method for producing components made of such a flat steel product.
Abstract:
The invention relates to a method for preparing a lining element of a grinding mill from a metallic material, in which method a metal preform is hot worked to a working degree of at least 3, and the hot working is carried out in at least two directions. Preferably, the metal preform is prepared by remelting a metal electrode using electro slag remelting or vacuum arc remelting, and the remelted metallic material is allowed to solidify. The invention further relates to the use of a lining element prepared by the method in linings of grinding mills.
Abstract:
A steel filament adapted for the reinforcement of elastomer or for thermoplastic products has a carbon content ranging up to 0.20 per cent by weight. The steel filament is provided with a coating promoting the adhesion with elastomer or thermoplastic products. The steel filament is drawn until a final diameter of less than 0.60 mm and a final tensile strength of more than 1200 MPa. Intermediate heat treatments are avoided so that the carbon footprint of the steel filament is substantially reduced.
Abstract:
L invention concerne un procédé d assemblage entre une pièce en matériau métallique (1) et une pièce en matériau composite (2), la jonction entre lesdites pièces étant réalisée au moyen d une fixation de section sensiblement constante reçue dans un premier trou réalisé (11) dans la pièce en matériau métallique et un deuxième trou (3) réalisé dans la pièce en matériau composite. Selon l invention, préalablement à l assemblage entre lesdites pièces, le procédé comporte : -une étape d expansion pour générer un champ de contraintes de compression à la périphérie dudit premier trou (11) et localement dans le matériau constituant la pièce en matériau métallique au moyen d un outil d expansion, -une étape d alésage unique pour réaliser ledit premier trou (11) et ledit deuxième trou (3) ayant un diamètre O final sensiblement supérieur au diamètre de la fixation (9) de manière à laisser un interstice entre la paroi interne desdits trous (3, 11) et la surface externe de la fixation (9), -une étape d assemblage pour positionner la fixation (9) dans lesdits trous (3, 11) pour maintenir la pièce métallique et la pièce composite ensemble.
Abstract:
Die Erfindung betrifft ein Trenn- und Schneidewerkzeug (1) mit einem Stammblatt (5), mindestens einem Schneidsegment (2) und mindestens einer in das Stammblatt (5) eingebrachten Hinterlochung (10), und ein Verfahren zur Herstellung eines solchen Trenn- und Schneidewerkzeugs (1). Erfindungsgemäß ist das Stammblatt (5) im Bereich (11) der mindestens einen Hinterlochung (10) mittels eines geeigneten Werkzeugs bleibend kalt verfestigt.
Abstract:
A method for cold working spot welded structures to improve fatigue life, and structures made by the method. Partially finished structures are provided assembled and joined by a spot weld nugget. Opposing indenters, or an indenter and a backing anvil, are used to squeeze the spot weld nugget to form one or two cold working dimples, respectively. Residual compressive stress is imparted in the workpiece, resulting in increased fatigue life.
Abstract:
A method of making high-strength steel structural members is disclosed by providing a blank of high-strength steel having a ferrite-pearlite microstructure and high-strength mechanical properties and cold forming the blank by rolling, upsetting, forging, or extrusion to provide a structural member having a desired geometric cross section while the mechanical strength of the structural member remains substantially the same or greater than the blank.
Abstract:
Tooling and a method of employing tooling (90, 130) to produce beneficial stress waves in a substrate (132) to provide high fatigue life structures. Stress waves (159, 152) are provided to work a substrate, causing dimples (170) in the workpiece, along a uniform pressure profile in the workpiece. By use of the method, uniform beneficial residual stress is provided at surface and midplane apertures in a workpiece, so as to improve overall fatigue life. An improved tool shape (92) is described, having a smooth curve, rather than a flat punch. Also, the use of a consumable wafer (W) provides additional uniform stress profile benefits.