Abstract
In the Al–2.0 wt.%Fe alloy the laser surface remelting (LSR) treatment was executed to investigate the treated and untreated layers areas, at different laser beam scanning, among them, 80, 100 and 120 mm/s, to respect, was presented and discussed about microstructural characteristics using the FEG and EDS techniques, and numerical experiments of pyramidal indentations of the LSR-treated systems were conducted using the FEM method. In the sample-treated cross-sectional area, the microstructure presented a columnar growth characteristic, a lot of nano-porosities and large size of the molten pool geometry in low laser beam scanning, however, in high laser beam scanning, the microstructure consisted of a cellular arrangement or fine-grained microstructure, the nano-porosities concentration and the molten pool geometry are slightly decreased. Besides, the micro-hardness in the LSR-treated area increased slightly as a function of increase of the laser beam scanning, but, the micro-hardness was much higher than the untreated sample. Meanwhile, modeling of indentation on COMSOL of the LSR-treatment by finite element method of the micro-hardness was successfully calculated. Therefore, a good agreement was found between experimental and simulated data.
Highlights
Fe-Al based alloys are applied in wide fields and attracted more attention owing to excellent high-temperature corrosion resistance, low cost, reasonable weight and considerable mechanical properties
Han et al [3] in your research work, which phase equilibria of the Al-rich portion in the Fe-Al binary system were determined by conventional heat treatment for equilibration, the diffusion couple method and thermal analysis and equilibrium compositions of the Fe-Al alloy were determined at temperatures between 600oC and 1145oC, wherein solubility ranges of the ζ − F eAl2, η − F e2Al5 and θ − F e4Al13 phases were determined in detail, by these authors
The results obtained from the characterization of Al-2.0 wt.% Fe alloy laser surface remelting (LSR)-treated, at the laser beam scanning: 80, 100 and 120 mm/s are presented and discussed using the techniques and methodologies already described, where its microstructural modifications will be analyzed, besides its aspects related to micro hardness
Summary
Fe-Al based alloys are applied in wide fields and attracted more attention owing to excellent high-temperature corrosion resistance, low cost, reasonable weight and considerable mechanical properties. The knowledge of phase relations in the Al-Fe system is important to understand the properties and microstructure of commercial Al-alloys, which contain other components such as Si and Mg. Even small amounts of Fe may cause formation of intermetallic compounds substantially influencing mechanical, an important study carried out by Zienert and Fabrichnaya [2]. Several intermetallic phases (e.g., F e3Al, FeAl and F eAl3) may form in the Fe-Al system depending on the composition and cooling rate, especially from the Al-rich melts through invariant (peritectic, eutectic) or congruous solidification transformation, as described by Mukherjee et al [4]. The AA 6xxx Al alloys, for instance, contain Fe intermetallics, such as A-Fe, Al-Fe-Si and Al-Fe-Mn-Si phases, which are formed between the aluminum dendrites or cells. The type of phase formed depends mainly on the cooling rate and on the Fe to Si ratio of the alloy [5]
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