Ferrite Effects in Fe-Mn-Al-C Triplex Steels

Hot deformation characterization of duplex low-density steel through 3D processing map development

“…8a) in comparison to 600 °C\10 -3 s -1 . However, the microstructures of both conditions are characterized with formation of longitudinal micro-cracks along the ferrite phase boundaries due to dissimilar plastic behavior of phases at ferrite\austenite interfaces [42][43][44][45]. Fig.…”

Strengthening Mechanisms in Low Density Fe–26Mn–xAl–1C Steels

“…Thus, the balance strength in 12Al steel was associated with the presence of ferrite and κ carbides. In Fe–28.8Mn––9.4Al–xC triplex steels, it was suggested that a small ferrite fraction increases the yield strength by ≈30–50 MPa, following a decrease at high ferrite fraction. The volume fraction of ferrite in the present study was ≈7%, and 50 MPa was considered as the approximate contribution to yield strength by ferrite.…”

“…Yield strength of 730 MPa, ultimate tensile strength of 1000 MPa, and total elongation of up to 50% was observed in a triplex Fe–28Mn–12Al–1C steel . More recently, it was noted that a decrease in austenite grain size led to higher strength, carbon‐content in austenite had significant influence on tensile properties, and ferrite fraction had a positive effect on strength when it's content was less than 5% in high Mn triplex low density steels …”

“…High yield strength is of particular relevance in the automotive sector for anti‐intrusion assembly . Triplex low density steels are expected to have much higher yield strength than single phase austenite steels at a similar grain size . Although some work has been carried out to address the strengthening mechanisms in alloys with triplex structures, the effect of Al, which is the dominant element in low density Fe–Mn–Al–C steel, on the variation of yield strength has not been appropriately addressed.…”

Structure and properties of κ-carbides in duplex lightweight steels

“…The microstructural and mechanical properties of the lightweight steels change with Al and Mn compositions accordingly [1][2]. The formation of κ-(Fe,Mn) 3 AlC carbide (so called κ-carbide) is promoted by the addition of Al element [3,4].…”