Abstract
In this study, Fe-25Mn-9Al-8Ni-1C-xTi alloy (x = 0, 0.1, 0.2, 0.3, 0.4 wt.%) was prepared by vacuum arc melting, and the corresponding microstructure and oxidation behavior at 600 °C were studied. The results show that Fe-25Mn-9Al-8Ni-1C-xTi alloy mainly contains austenite phase, ferrite phase and TiC phase. With Ti content increasing, the austenite phase content decreases, while the contents of ferrite phase and TiC phase increase. The oxidation performance test results show that the addition of Ti element greatly reduces the oxidation weight gain of the alloys at the initial oxidation stage. With the extension of the oxidation time and the further increase of the Ti content, the alloys oxidation weight gain shows a trend of first increasing and then decreasing. When the Ti content is 0.2 wt.%, the oxidation weight gain of this series of alloy reaches the lowest value during the stable oxidation period. Compared with Fe-25Mn-9Al-8Ni-1C alloy, its weight gain per unit area is reduced by 21.1%. Fe-25Mn-9Al-8Ni-1C-xTi alloy oxide layer exhibits a double-layer structure. The outer oxygen layer is mainly loose iron-oxides, while in the inner oxygen layer, the oxides are mainly composed of manganese-oxides and aluminum-oxides, which are relatively dense.
Highlights
High power density diesel engines are widely used in heavy trucks, tanks and other vehicles because of their excellent fuel economy and power [1,2]
In order to further improve the mechanical properties of Fe–Mn–Al–C alloy, some researchers added a small amount of trace element Ti to the system and found that Ti element can effectively refine the grains [26,27]
XRD tests were carried out on the surface of the alloys with different Ti content after oxidation, andtests the results present in Figure can be seen
Summary
High power density diesel engines are widely used in heavy trucks, tanks and other vehicles because of their excellent fuel economy and power [1,2]. In order to further improve the mechanical properties of Fe–Mn–Al–C alloy, some researchers added a small amount of trace element Ti to the system and found that Ti element can effectively refine the grains [26,27]. Han et al found that the tempering temperature could reduce the TiC grain size in low-carbon medium manganese steel, and TiC precipitation could effectively refine austenite grains, lead to dislocation strengthening and further improve its strength and toughness [28]. The microstructure and oxidation properties at 600 ◦ C were systematically studied, which could provide theoretical guidance for the development of new-type high-strength and low-density cylinder head materials
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