LMD-p utilises a high power laser in order to create a melt pool into which the powder is fed. The powder is delivered into the melt pool through a nozzle, carried by an inert gas (usually argon or helium). The nozzle used in this project is coaxial to the laser beam and both the nozzle and the laser optics is mounted on an ABB robot which is used as the guiding system for the process. LMD-p manufactured components are built through deposition of adjacent weld beads in multiple layers, until the final geometry is achieved.
This project is namely directed at applications for the aerospace industry where Alloy-718 is an important material. Alloy-718 is a nickel-iron based superalloy that makes up approximately 30 % of the material in a commercial JET engine. Additionally, Alloy-718 has a comparatively good weldability in comparison with other superalloys. This makes it a good alternative for the LMD-p process.
In the aerospace industry there is a high demand for reduction of waste material which for certain parts are very high. LMD-p has shown great potential in reducing waste material through near net shape production. However, in the aerospace industry there is also a high demands on the material integrity and therefore there is a great need to improve the LMD-p manufacturing processes and to understand how the process parameters influences the material in terms of microstructure and defects. The relationship between the main process parameters, which are the laser power, powder feeding rate and traverse speed, and the deposit characteristics in terms of microstructure, surface finish and defects is crucial to understand and is the main focus in this project.
Forskningsmiljö / Institution
Produktionsteknik Väst, PTV
Institutionen för ingenjörsvetenskap