Application of LENS method in Fe40Al + n-Al2O3 composite materials fabrication
Tomasz Durejko, Emilia Żuchowska, Magdalena Łazińska
Quarterly No. 2, 2012 pages 81-85
DOI:
keywords: intermetallic phase Fe40Al, oxide dispersion strengthennig, LENS (Laser Engineered Net Shaping), Al2O3 nanoceramics
abstract The present study examines the impast of nanoceramics on the structure and selected mechanical properties of intermetallic alloys. In order to determine the grain size in the different variants of materials, with LENS fabricated Fe40Al, an equivalent mean diameter was determined. Resistance against oxidation of the material with and without the addition of nanoceramics was also determined. Observations of the microstructure and phasal analysis did not reveal the presence of nanoceramics in the bulk of the material. However, it was found that the addition of nano-oxide ceramics, increases the grain size and a 4-fold increased heat resistance compared to the reference material. For the alloy without the addition of the oxide nanoceramics, a relative deformation of 2% at a lower yield than the 2% composite Fe40Al vol. n-Al2O3 was reported. An attempt to explain the situation it was based on research using the Thermal Imager, which is equipped with a LENS MR-7. It allowed permanent registration of the temperature distribution and weld puddle determining a number of thermodynamic dependences. It additionally drew attention to the fact that during the manufacturing process, differences between the width of the liquid metal mesh for the alloys with and without nanoceramics was observed. It indirectly proves the existence of ceramics on the surface of powder particles at the time of melting the base material, and probably there where an increase in the width of the weld puddle was observed.