Filtern
Erscheinungsjahr
- 2015 (3) (entfernen)
Dokumenttyp
- Beitrag zu einem Tagungsband (3) (entfernen)
Sprache
- Englisch (3)
Referierte Publikation
- ja (3) (entfernen)
Schlagworte
- Additive manufacturing (1)
- Deposition rate (1)
- Hot cracking test (1)
- Inconel 718 (1)
- Laser beam wlding (1)
- Laser metal deposition (1)
- Macro processing (1)
- Optical measuring technique (1)
- Process chain (1)
- Solidification cracking (1)
Selective Laser Melting (SLM) and Laser Metal Deposition (LMD) are prominent methods in the field of additive manufacturing technology. While the powder-bed based SLM allows the manufacturing of complex structures, buildrate and part volumes are limited. In contrast, LMD is able to operate with high deposition rates on existing parts, however shape complexity is limited. Utilizing their respective strengths, a combination of these two additive technologies has the potential to produce complex parts with high deposition rates.
In this paper, a process chain consisting of additive technologies SLM and LMD is described. The experiments are conducted using the alloys Ti-6Al-4V and Inconel 718. A cylindrical test specimen is produced and the microstructure along the SLM-LMD zone is described. In addition, this process chain was tested in the manufacturing of a turbine blade. The feasibility of implementing this process chain for small batch production is discussed. The results are evaluated to show advantages and limitations of the SLM-LMD process chain. This paper is relevant for industrial or scientific users of additive manufacturing technologies, who are interested in the feasibility of a SLM-LMD process chain and its potential for increased deposition rates.
The industrial demand for flexible and innovative manufacturing technologies is continuously increasing. These technologies have to be sustainable and resource-efficient, and have to allow the production of long-life capital goods. Consequently, the additive processes gain in importance as they offer an enormous potential of application, especially for the turbomachinery industry.
In order to use additive manufacturing technologies in industrial applications, it is necessary to consider the complete process chain, including all necessary pre- and postprocessing. Although additive manufacturing is increasingly covered in scientific research, the linking between this technology and conventional industrial processes is rarely described.
The safety of components or constructions is of great importance in the manufacturing and processing of metallic materials. Solidification cracking as well as the weldability of materials remain still for many years a highly contentious issues, particularly with regard to the causes of the hot crack formation. Many of studies have been conducted to determine the critical condition of occurrence of the solidification cracking. In this study different digital image correlation measuring techniques in conjunction with laser diodes as the illuminating source have been employed to measure the arising strain field during the laser welding process at the surface of the workpiece directed to the laser beam in the close vicinity of the weld pool. The Controlled Tensile Weldability test (CTW) was used to apply an external tensile load during the laser beam welding in order to generate the solidification cracks. The results showed that by means of those techniques it is possible to measure the strain field without any disturbances from the intense welding light or the smoke. Additionally, the strain and the strain rate as a critical factor determining solidification crack formation can be measured and analyzed.