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The Microstructure Evolution of a Fe3Al Alloy during the LENS Process

Department of Advanced Materials and Technologies, Military University of Technology, ul. Gen. Urbanowicza 2, 00-908 Warsaw, Poland
Author to whom correspondence should be addressed.
Materials 2018, 11(3), 390;
Received: 1 February 2018 / Revised: 2 March 2018 / Accepted: 4 March 2018 / Published: 7 March 2018
(This article belongs to the Special Issue Laser Materials Processing)
A Fe3Al intermetallic alloy has been successfully prepared by the laser-engineered net shaping (LENS) process. The applied process parameters were selected to provide various cooling rates during the solidification of the laser-melted material. The macro- and microstructure and the micro- and macrotexture of Fe3Al samples were investigated. The influence of the cooling rate on grain morphology and texture is discussed. For the applied cooling rate range of 0.64 × 104 K/s–2.6 × 104 K/s, the structure is characterized by the presence of columnar grains for which the growth is directed upwards from the substrate. The intensity of the microtexture varies with the height of the sample and the cooling rate. The intensity of the texture increases with the decrease in the cooling rate. The samples that were obtained with low and medium cooling rates are characterized by the well-developed <100> and <111> macrotextures. The Fe3Al alloy that was produced with a high cooling rate did not show a specific texture, which is reflected in the fairly uniform distribution of the normalized density intensity. Only a very weak texture with a <100> type component was observed. View Full-Text
Keywords: LENS; intermetallic alloys; microstructure LENS; intermetallic alloys; microstructure
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Karczewski, K.; Durejko, T.; Czujko, T. The Microstructure Evolution of a Fe3Al Alloy during the LENS Process. Materials 2018, 11, 390.

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