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. 2019 Aug 12;12(16):2572.
doi: 10.3390/ma12162572.

Corrosion and Oxidation Behavior of a Fe-Al-Mn-C Duplex Alloy

Silvia Barella  1 , Andrea Francesco Ciuffini  1 , Andrea Gruttadauria  1 , Carlo Mapelli  2 , Davide Mombelli  1 , Eugenio Longaretti  3
Affiliations

Corrosion and Oxidation Behavior of a Fe-Al-Mn-C Duplex Alloy

Silvia Barella et al. Materials (Basel). .

Abstract

The low-density steels represent a topic of great interest within the scientific world because of the great demand from the steel market of increasingly lighter materials, also featured by an optimal mix of the mechanical properties. In this work, the corrosion and hot oxidation resistance of a Fe-15%Mn-9.5%Al-6.5%Ni-1%Cr-0.43%C were analyzed and related to the microstructural features. The material behavior was analyzed both in the as-cast and in the heat-treated state. For the corrosion test, the experimental plan was fulfilled using four different concentrations of HCl and four temperatures. In the case of hot oxidation resistance, the exposure time and the temperature effects were evaluated. The corrosion resistance in HCl was comparable to the stainless steel, and the iso-corrosion curves showed excellent resistance of the 1300 °C solution-treated material, especially at low temperatures, but it is also good at high temperatures due to the hot oxidation.

Keywords: Fe-Mn-Al-Ni steel; corrosion; light steel; potentiodynamic curves.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Experimental plan for the study of the corrosion in Chlorine-rich environments, for as-cast and 1300 °C solution-treated samples.
Figure 2
Figure 2
Experimental plan for the study of the hot oxidation resistance for the as-cast alloy.
Figure 3
Figure 3
Optical Microscopy microstructure of the as-cast alloy. (A) beraha’s tint etching; (B) nital 5% etching.
Figure 4
Figure 4
Scanning electron microscopy (SEM) analysis of the as-cast alloy.
Figure 5
Figure 5
OM of solution-treated samples.
Figure 6
Figure 6
SEM analysis of solution-treated samples.
Figure 7
Figure 7
Corrosion rates in 2.3% HCl solution at RT as a function of the solution treatment temperature.
Figure 8
Figure 8
Corrosion rates of the as-cast material as a function of HCl concentration (A) and temperature (B).
Figure 9
Figure 9
Corrosion rates of the as-cast material as a function of temperature and HCl concentration.
Figure 10
Figure 10
Corrosion rates of the 1300 °C solution-treated alloy as a function of HCl concentration (A) and temperature (B).
Figure 11
Figure 11
Corrosion rates of the 1300 °C solution-treated alloy as a function of temperature and HCl concentration.
Figure 12
Figure 12
As-cast sample after (A) and before (B) corrosion test in 3.5% HCl solution at RT for 15 min.
Figure 13
Figure 13
Anodic polarization curves (in 3.5 wt.% of NaCl) of AISI304 (as reference), Fe-Mn-Al-C in the as-cast condition and solution treated (1300 °C for 1 h/inch).
Figure 14
Figure 14
Isothermal curves of the hot oxidation rates over time for the as-cast material.
Figure 15
Figure 15
Three axes diagram showing the trend of hot oxidation rates of the as-cast alloy as a function of time and temperature.
Figure 16
Figure 16
As-cast specimens polished, etched, and hot oxidized for ten min at 750 °C (A) and 900 °C (B).
Figure 17
Figure 17
SEM/SE images of the etched and subsequently hot oxidized for 10 min as-cast specimens at 900 °C and 750 °C (γ-phase and β’ matrix detail).
Figure 18
Figure 18
Iso-corrosion curves for the as-cast material and the thermal treated at 1300 °C alloy, compared with several commercial stainless steel grades; it is possible to appreciate the beneficial effect of the high-temperature solution treatment on the analyzed material.
Figure 19
Figure 19
As-cast sample hot oxidized at 900 °C: the detail of the unaltered b.c.c. β’ matrix and the oxide layer born from the austenitic phase.
Figure 20
Figure 20
As-cast sample hot oxidized at 750 °C with the high magnified detail of the matrix.
Figure 21
Figure 21
The three oxidation zones of the hot oxidation behavior at 900 °C and 750 °C of the Fe-15%Mn-9.5%Al-6.5%Ni-1%Cr-0.43%C alloy.
See this image and copyright information in PMC

References

    1. Frommeyer G., Brüx U. Microstructures and mechanical properties of high-strength Fe-Mn-Al-C light-weight TRIPLEX steels. Steel Res. Int. 2006;77:627. doi: 10.1002/srin.200606440. - DOI
    1. Zhang L., Song R., Zhao C., Yang F., Xu Y., Peng S. Evolution of the microstructure and mechanical properties of an austenite-ferrite Fe-Mn-Al-C steel. Mater. Sci. Eng. A. 2015;643:183–193. doi: 10.1016/j.msea.2015.07.043. - DOI
    1. Wu Z.Q., Ding H., An X.H., Han D., Liao X.Z. Influence of Al content on the strain-hardening behavior of aged low density Fe-Mn-Al-C steels with high Al content. Mater. Sci. Eng. A. 2015;639:187–191. doi: 10.1016/j.msea.2015.05.002. - DOI
    1. Lee S., Jeong J., Lee Y.-K. Precipitation and dissolution behavior of κ-carbide during continuous heating in Fe-9.3Mn-5.6Al-0.16C lightweight steel. J. Alloy. Compd. 2015;648:149–153. doi: 10.1016/j.jallcom.2015.06.048. - DOI
    1. Yang F., Song R., Li Y., Sun T., Wang K. Tensile deformation of low density duplex Fe-Mn-Al-C steel. Mater. Des. 2015;76:32–39. doi: 10.1016/j.matdes.2015.03.043. - DOI

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