A New Austenitic FeMnAlCrC Alloy with High-Strength, High-Ductility, and Moderate Corrosion Resistance

Abstract

In this study, a new austenitic Fe-28%Mn-9%Al-6%Cr-1.8%C (in mass%) alloy is developed. Because the alloy contains a high density of fine (Fe,Mn) 3 AlC carbides within the austenite matrix, the alloy in the as-quenched condition exhibits an excellent combination of strength and ductility comparable to that of the aged FeMnAlC alloys. In addition, owing to the formation of a layer of Cr and Al oxides in the passive film formed on the alloys, the corrosion potential E corr (À538 mV) and the pitting potential E pp (À25 mV) of the present alloy in 3.5% NaCl solution are considerably higher than the E corr (À920$À789 mV) and E pp (À500$À240 mV) values of the as-quenched and aged FeMnAlC alloys. Whereas the tensile strength of the present alloy is almost the same as that of conventional AISI 410 martensitic stainless steel, the present alloy possesses superior ductility than AISI 410 martensitic stainless steel. Furthermore, in 3.5% NaCl solution, the E pp (À25 mV) of the present alloy is noticeably higher than that (À250$À100 mV) of the conventional AISI 410 martensitic stainless steel. These results indicate that the present alloy in the as-quenched condition can possess high-strength and high-ductility as well as moderate corrosion resistance.

Some aspects of high manganese twinning-induced plasticity (TWIP) steel, a review

“…For some special purposes, e.g. to improve the oxidation and corrosion resistance, Cr is a usual element to be used in TWIP steels along with Al [13][14][15][16][17] .…”

“…In a recent study, Tsay et al [14] reported a new high manganese austenitic Fe-28Mn-9Al-6Cr-1.8C alloy with high-strength, high-ductility and moderate corrosion resistance. This alloy contains a high density of fine (Fe, Mn) 3 AlC carbides formed coherently within the austenite matrix during quenching.…”

“…In this review, the alloying fundamentals of TWIP steel is briefly introduced at first, while the emphasis of this presentation is put on the effects of the grain size, strain rate and deformation temperature on the tensile properties of the Fe-Mn-Al-C and Fe-Mn-Si-Al alloy systems in associating with their deformation mechanisms. As a class of age-hardenable austenitebased steels containing the high content of Mn, Al and C, this Fe-Mn-Al-C steel class was first developed in late 1950s for the use of cryogenic or highly corrosive environments by replacing the high Ni-Cr steel [10][11][12] and recently reappraised as the promising candidate for austenitic stainless steel by adding some content of Cr [13,14] . Thus, the evaluation of the high temperature anti-oxidation behavior and corrosion resistance of Fe-Mn-Al-C system steels is also presented.…”

Corrosion Mechanisms of High-Mn Twinning-Induced Plasticity (TWIP) Steels: A Critical Review

“…Tsay et al studied the corrosion behavior of Fe−28Mn−9Al−6Cr−1.8C alloy in 3.5 wt.% NaCl [102]. Due to Cr and Al oxide formation, the E corr and E pit were −538 mV and −25 mV, respectively, significantly higher than −920 mV (∼−789 mV) and −500 mV (∼−240 mV) for E corr and E pit , respectively, of Fe−28Mn−9Al−6Cr−1.8C alloy.…”

“…Fe−Mn−Al−C steel was first developed in late 1950s for the use of cryogenic or highly corrosive environments by replacing the high Fe−Ni−Cr SS cryogenic [219], and recently reappraised as a promising candidate for austenitic SS by adding some content of Cr [102].…”