摘要:
Heat treatment of alloys having elements for improving grain boundary strength. Components directly after castings often reveal a low or no transverse grain boundary strength, so that cracks do appear and decrease the yield rate. The inventive measures does not lead to low transverse grain boundary strength but maintains a efficient grain boundary strength, so that the yield rate of components without cracks is increased.
摘要:
Components having a certain fiber matrix structure can be obtained by using a specific molybdenum-silicon-boron alloy and carrying out a certain production method. Said components can be used in high-temperature applications and can be produced cost-effectively.
摘要:
The invention provides a method (1) for the additive manufacturing of a workpiece (2) from a raw material (14), comprising at least one metal, wherein a geometric model (10) of the workpiece (2) is produced and the model (10) is divided into a plurality of individual parts (12a-12f), wherein each individual part (12a-12f) is manufactured in stages from the raw material (14), in that in a manufacturing step (32), a respective amount (34) of the raw material (14) is locally fused to an already manufactured part (13b-13e) of the respective individual part (12a-12f) using localized application of heat, and solidified in the same place, and wherein the individual parts (12a-12f) are joined by a diffusion process using the application of pressure (20a, b) and the local application of heat at the contact surfaces (24a-d), and in this way the finished workpiece (2) is joined. The invention additionally provides a workpiece (2) manufactured from a raw material (14) by means of a method (1) of this type.
摘要:
The oscillating movement in a vertical and/or horizontal direction during welding results in smaller grains, which prevent the formation of fractures during welding. The invention relates to a method for welding a substrate (3), in which an energy source (13) and/or a material feed (14) is or are moved in an oscillating motion over the surface (5) of the substrate (3).
摘要:
A substrate (4) is remelted prior to deposition welding, thereby substantially reducing stresses in the region of the interface between the deposition welded portion (13) and the substrate (4).
摘要:
The invention relates to a powder supply device (1) for a laser powder welding device and a laser powder welding device having such a powder supply device (1). The powder supply device (1) comprises a nozzle head (3) which tapers along a longitudinal axis (2) of the powder supply device (1) in the direction to a first end (4) and has a cavity (6). The cavity (6) is arranged radially about the longitudinal axis (2) in an interior of the nozzle head (3) and tapers to the first end (4) of the nozzle head (3). The cavity (6) opens out into an annular opening (7) which is arranged at the first end (4) for discharging a powder. The powder supply device (1) has a plurality N of powder feed lines (8-1, 8-2, 8-3) which extend through a second end (5) of the nozzle head (3), which lies opposite the first end (4) of the nozzle head, in the direction to the cavity (6) and are designed to direct the powder from a powder reservoir into the cavity (6).
摘要:
Through the targeted selection of method parameters with respect to laser welding, advancement, laser power beam diameter and powder mass flow, the temperature gradient, which is fundamentally decisive for the single-crystal growth during laser cladding, can be set in a targeted manner.
摘要:
In a repair method according to the invention for repairing components (1) comprising a base material with a directed microstructure, the repair is performed in such a way that the repaired location (3) correspondingly has a directed microstructure like the surrounding base material. A solder (7) is applied in the region of a location (3) to be repaired and is soldered to the component (1) by means of heat exposure (9). During the heat exposure (9), a temperature gradient, i.e. for instance a temperature variation from a higher temperature to a lower temperature, is thereby produced in the region of the location (3) to be repaired.