4. Conclusions

sample, the corresponds values were found, for L = 1000 H and for treated sample

Figures 10 and 11 show experimental results that were overlaid with simulated data for untreated and LSR-treated workpieces, respectively, thus, curves presented a good fit for the untreated case (Figure 10), where experimental and simulated

Moreover, for LSR-treated case, curves did not present a good fit (Figure 11), experimental and simulated values are quite different. This is because, after LSRtreated, treated layer is composed of metastable phases, mainly consisting of alumina and aluminum nitride, besides, microstructure showing multiple laser tracks characteristics formed during laser treatment, however, the molten pool zone showed a fine microstructure due to high quenching rates applied, meanwhile, Guan et al. [28] argued, which laser beam tracks has significant influence on surface quality of laser-treated materials. Consequently, LSR-treated layer has a very complex feature; with certainly, EC proposed should be more complex for LSR-treated. Different authors reported several investigations about this study, which microstructure characteristic caused by overlapping ratios and multi-track, influence on electrochemical behavior or laser multi-track overlapping and consequently in effect of corrosion process. According to previous works, He et al. [27] point out that overlapping tracks affect heat transfer and liquid flow, microstructure

was L = 5000 H.

Aerospace Engineering

Figure 10.

Figure 11.

186

Nyquist diagram of experimental and simulated result of a untreated sample.

Nyquist diagram of experimental and simulated result of a LSR-treated workpiece.

values are very close.

This research involved a study of hypoeutectic Al-2.0 wt.% Fe alloy subjected to a laser surface remelting (LSR) treatment. The main results are the following:


oxide layer properties, consequently, microstructure characteristic caused by overlapping ratios and multi-track has a notorious effect on electrochemical process.

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