A high strength member according to the present invention is the high strength member having a bending ridge line portion formed from a steel sheet, the member having a tensile strength of 1470 MPa or higher, a residual stress of 300 MPa or lower in an end surface of the bending ridge line portion, and a Vickers hardness (HV) of 200 or higher and 450 or lower in the end surface of the bending ridge line portion.

A wheel disc including a bolt hole for bolt fastening, includes a first region extending to have a predetermined width in a circumferential direction of the bolt hole and a second region, other than the first region, wherein the first region has an average tensile strength lower than that of the second region.

A method for producing a workpiece having a toothing or profiling, including the steps: a) soft machining the workpiece to produce the toothing or profiling; b) hardening the toothing or profiling; c) hard fine machining the toothing or profiling with a first tool that is a grinding worm, a grinding wheel or a honing wheel, wherein the first tool has a base body with a first elastic modulus; d) reinforcement of at least a section of the workpiece by shot blasting; and, following step d), e) repeated hard fine machining of the toothing or profiling with a second tool that is a grinding worm, a grinding wheel, a set of grinding wheels or a honing wheel. The second tool has a plastic or rubber base body with a second elastic modulus which is at most 33% of the first elastic modulus.

A method of stamping for separating a workpiece part of sheet metal to obtain a workpiece, the method including a work-hardening step of generating work-hardening at vicinity of outline of the workpiece part of the sheet metal by moving a work-hardening punch having an end side facing the sheet metal toward the sheet metal and locally pressing the vicinity of the outline along the outline with a work-hardening projection provided on the end side of the work-hardening punch, and a separation step of punching the workpiece part of the sheet metal which has finished the work-hardening step with a separation punch and thereby separating the workpiece part from the sheet metal, wherein the work-hardening projection is formed to have V-shaped cross-section with both inner wall and outer wall of the work-hardening projection being inclined to pressing direction of the work-hardening punch.

A method for heat treatment of an object of sheet metal, includes the step of heating at least one selected portion of the object using an energy beam. The beam is projected onto a surface of the object so as to produce a primary spot on the object, the beam being repetitively scanned in two dimensions in accordance with a scanning pattern so as to establish an effective spot on the object, the effective spot having a two-dimensional energy distribution. The effective spot is displaced in relation to the surface of the object to progressively heat the at least one selected portion of the object. The scanning pattern includes interconnected curved segments.

Disclosed is a tempering station for the partial heat treatment of a metal component, the station including a processing plane arranged in the tempering station, at least one nozzle, aligned to the processing plane, for discharging of a fluid flow for the cooling of at least a first sub-area of the component, and at least one nozzle box, arranged above the processing plane. The at least one nozzle box forms at least one nozzle area in which the at least one nozzle is at least partially arrangeable and/or which at least partially delimits a propagation of the fluid flow, with the at least one nozzle box being at least partially formed with a ceramic material. The tempering station permits a sufficiently reliable thermal delimitation of heat treatment measures partially acting on the component and/or a sufficiently reliable thermal separation of different heat treatment procedures partially acting on the component.

A double-side synchronous laser shock peening (LSP) method for leading edges of turbine blades employs two laser beams with the same diameter and different pulse energy to synchronously shock the front and back sides of each point within 8-10 mm range of the leading edge of the blade, wherein the laser pulse energy on the front side is greater than the laser pulse energy on the back side, and wherein, the laser power density on the front side is used to generate dynamic plastic deformation on the entire laser-shock spot area, while the laser power density on the back side is used to balance off excessive shock-wave pressure in the central area of laser-shock spot on the front side and avoid macroscopic deformation of the blade in the central area of laser-shock spot on the front side, and an optimal strengthening effect is achieved finally.

A method for producing a steel plate member (SPM), including: a quenching step for heating the SPM to a temperature higher than an austenite transformation finish temperature A3 and subsequently cooling the SPM at a cooling rate (CR) faster than an upper critical CR; and a tempering step for reheating a second region of the SPM to a temperature higher than an austenite transformation start temperature A1 without reheating a first region of the SPM after quenching and subsequently cooling the SPM at a CR slower than a lower critical CR. In the cooling process of the tempering step, the shape of the second region is corrected in a temperature range from a temperature equal to or lower than A1 to a temperature equal to or higher than a temperature at which transformation into ferrite and pearlite is finished while maintaining the CR slower than the lower critical CR.

The invention relates principally to a welded steel part with a very high mechanical strength characteristics obtained by heating followed by hot forming, then cooling of at least one welded blank obtained by butt welding of at least one first and one second sheet consisting at least in part of a steel substrate and a pre-coating which is constituted by an intermetallic alloy layer in contact with the steel substrate, topped by a metal alloy layer of aluminum or aluminum-based alloy. This welded steel part claimed by the invention is essentially characterized in that the metal alloy layer (19, 20) has been removed from the edges (36) in direct proximity to the weld metal zone (35), while the intermetallic alloy layer (17, 18) has been left in place, and in that over at least a portion of the length of the weld metal zone (35), the ratio between the carbon content of the weld metal zone (35) and the carbon content of the substrate (25, 26) of either the first or the second sheet (11, 12) having the higher carbon content (Cmax) is between 1.27 and 1.59. The invention likewise relates to a method for the fabrication of a welded steel part as well as the use of this welded steel part for the fabrication of structural or safety parts for automotive vehicles.

A method of manufacturing a stator is provided. The method may include stamping steel into laminations each having an inner edge area defining a residual stress associated with a magnetic permeability. The method may also include exposing the laminations to a changing magnetic field such that, for each of the laminations, a density of resulting eddy currents is greatest near the inner edge area to heat the same relative to central areas of the lamination to decrease the residual stress and core loss.