Development of a model for prediction of material properties of laser cladded inconel 718 as related to porosity in the bulk material

Publikationstyp
Conference Paper
Date Issued
2011-10
Sprache
English
Author(s)
Witzel, Johannes  
Schopphoven, Thomas  
Gasser, Andres  
Kelbassa, Ingomar  
TORE-URI
http://hdl.handle.net/11420/12472
Start Page
275
End Page
282
Citation
30th International Congress on Applications of Lasers and Electro-Optics, ICALEO 2011: 275-282 (2011)
Contribution to Conference
30th International Congress on Applications of Lasers and Electro-Optics, ICALEO 2011  
Publisher DOI
10.2351/1.5062247
Scopus ID
2-s2.0-82655179838
Publisher
Laser Inst. of America
High value jet engine components such as compressor blades or BLade Integrated DiSKS (BLISKS) are manufactured by time and cost-prohibitive conventional techniques, such as five-axis milling, linear friction welding and electro chemical machining. This project within the Fraunhofer Cluster of Innovation "TurPro" qualifies the Laser metal deposition process (LMD) as a new "green manufacturing" method for nickel and titanium alloy-based BLISKs. Thus, a significant increase of the deposition rate (factor 10 or higher) is of interest. Aiming for a process certification of additive manufacturing of BLISK blades, using conventionally manufactured disks as a substrate, quality assurance and predictable material properties remain a major concern. In this paper, the distribution of pore sizes of laser deposited Inconel 718 (IN 718) is investigated, using laser powers of up to 5.5 kW and deposition rates of up to 7000 mm3/min. Using quantitative image analysis, defining sub-sets and applying extreme value and logarithmic Gaussian distribution, the pore-size-distribution in the bulk material can be described with merely 4 statistical parameters. Based on these parameters, the ultimate tensile strength (UTS) of a cladded sample can be estimated with an accuracy of approx. 250 - 300 MPa.
DDC Class
530: Physik