Age-hardening and formation of modulated structures in austenitic Fe-Mn-Al-C alloys

Ikarashi, Yukinori; Sato, Kazunori; Yamazaki, Taketomo; Inoue, Y.; Yamanaka, Masaki

doi:10.1007/bf00729475

Cited by 7 publications

(2 citation statements)

References 9 publications

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“…Stabilizes the к-phase [47,[80][81][82][83][84][85][86][87] Mo Increase the strain energy between the к-phase and γ, and also delay the precipitation of к-carbides during aging [88] Table 1. Summary of the alloy elements effects in the Fe-Mn-Al-C system…”

Section: Almentioning

confidence: 99%

A general perspective of Fe–Mn–Al–C steels

Zambrano

2018

J Mater Sci

174

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During the last years, the scientific and industrial community have focused on the astonishing properties of Fe-Mn-Al-C steels. These high advanced steels allow high-density reductions about ~18% lighter than conventional steels, high corrosion resistance, high strength (ultimate tensile strength (UTS) ~1 Gpa) and at the same time ductility above 60%.The increase of the tensile or yield strength and the ductility at the same time is almost a special feature of this kind of new steels, which makes them so interesting for many applications such as in the automotive, armor and mining industry. The control of these properties depends on a complex relationship between the chemical composition of the steel, the test temperature, the external loads and the processing parameters of the steel. This review has been conceived to tried to elucidate these complex relations and gather the most important aspects of Fe-Mn-Al-C steels developed so far.

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Section: Almentioning

confidence: 99%

A general perspective of Fe–Mn–Al–C steels

Zambrano

2018

J Mater Sci

174

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“…While grain refinement is generally applied for non-age hardenable Fe-Mn-Al-C alloys, precipitation hardening is a very significant strengthening mechanism for highly alloyed Fe-Mn-Al-C alloys. This mechanism determines the formation of nanoscale and homogeneously distributed k I -carbides, which influence the movement and arrangement of dislocations during deformation [14,15,16]. In addition to cryogenic applications, these alloys are also studied for applications at high temperatures.…”

Section: Introductionmentioning

confidence: 99%

Effect of composition and heat treatment on the mechanical properties of Fe Mn Al steels

Mondal

Pilone

Brotzu

et al. 2022

Frattura Ed Integrità Strutturale

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Starting from the research aimed at the development of substitute alloys for stainless steels, with the aim of replacing strategic metals such as chromium and nickel with the more available manganese, FeMnAlC alloys have been studied and developed for several years. These alloys exhibit an attractive strength/ductility combination, low density, and some of them show good oxidation behaviour at high temperatures. After a preliminary study, in this paper the effect of a solubilization treatment followed by aging in the temperature range 550 - 750 °C has been evaluated. The results of the investigation revealed that the steel characterized by the higher amount of Mn and Al shows, after heat treatment, the formation of phases that make the alloy very brittle. Considering the obtained results, it is evident that optimizing the alloy chemical composition is of paramount importance to guarantee a high fracture toughness if the steel works for limited time intervals at high temperature.

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Grain boundary precipitation reactions in a wrought Fe-8Al-5Ni-2C alloy prepared by the conventional ingot process

Hwang

Liu

1998

Metall Mater Trans A

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Phase transformations in the Fe-8Al-5Ni-2C alloy, prepared by rapid solidification processing (RSP), have been studied by Choo and Kim. [1] They showed that the microstructure of the alloy in the as-solidified condition was austenite phase (␥) containing fine ordered L'l 2 -type precipitates. The formation of these fine ordered L'l 2 -type precipitates, lying along the ͗100͘ directions in the matrix, was attributed to the spinodal decomposition. It was also shown that, on aging at 823 K, the fine ordered precipitates grew and, at the same time, ␣(ferrite) and -carbide formed by a heterogeneous reaction at the ␥/␥ grain boundaries. With increasing aging time, the heterogeneous reaction became predominant, leading to a two-phase microstructure of ␣ and -carbide in the end. [1] Recently, we performed transmission electron microscopy (TEM) observations of the phase transformations in the Fe-8Al-5Ni-2C alloy, prepared by conventional casting process. It was found that the microstructure of the alloy in the as-quenched condition was austenite phase containing fine ordered L'l 2 -type precipitates, similar to the previous results for the as-solidified alloy. However, when the as-quenched alloy was aged at 823 K for a long time, the equilibrium microstructure was observed to be a mixture of (␣ ϩ B2 ϩ -carbide), rather than ␣ ϩ -carbide as reported by Choo and Kim.The alloy, Fe-8Al-5Ni-2C, was prepared in an air induction furnace by using 99.5 pct iron, 99.7 pct aluminum, 99.5 pct nickel, and pure carbon powder. After being homogenized at 1523 K for 12 hours under a protective argon atmosphere, the ingot was hot forged and then cold rolled to a final thickness of 2.0 mm. The sheet was subsequently solution heat treated at 1323 K for 2 hours and quenched into room-temperature water. The aging treatments were performed at 823 K for various times in a salt bath. The microstructures of the alloy were examined by means of optical microscopy and TEM. Thin foil specimens for TEM were prepared in a double jet electropolisher, using an electrolyte of 30 pct acetic acid, 60 pct ethanol, and 10 pct perchloric acid at 263 to 283 K. The current density was kept in the range from 1.5 to 2.0 ϫ 10 4 A/m 2 . Electron microscopy was performed on a JEOL* 2000FX scanning *JEOL is a trademark of Japan Electron Optics Ltd., Tokyo.transmission electron microscope (STEM) operating at 200 kV. Elemental distributions were examined using a LINK-AN 10000 energy-dispersive X-ray spectrometer

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Age-hardening and formation of modulated structures in austenitic Fe-Mn-Al-C alloys

Cited by 7 publications

References 9 publications

A general perspective of Fe–Mn–Al–C steels

A general perspective of Fe–Mn–Al–C steels

Effect of composition and heat treatment on the mechanical properties of Fe Mn Al steels

Grain boundary precipitation reactions in a wrought Fe-8Al-5Ni-2C alloy prepared by the conventional ingot process

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