Obtaining Ultrastrong and Ductile Steel with Hierarchical Lamellar Duplex Phase Microstructure by Two-Stage Martensitic Transformation Mechanism

Mechanical Properties and Deformation Behavior in Severely Cold-Rolled Fe–Ni–Al–C Alloys with Lüders Deformation —Overview with Recent Experimental Results—

“…There is no clear correlation between • L and Lüders strain. If we focus on the shape of the stress-strain curves during tensile testing, we found that the FeNiAlC, 1,2,4,7) FeCr Ni 8,9) and FeNiMn 12) steels, with relatively large Lüders strain, do not show significant strain hardening after the Lüders deformation, while the FeMn steels, 3,6,10,11) with smaller Lüders strain, shows a large hardening after the Lüders deformation. Here, we will summarize the information in previous reports on FeMn, FeCrNi and FeNiMn base steels with a focus on Lüders deformation and mechanical properties.…”

“…: FeNiAlC, 1,2,4,7) : Fe Mn, 3,5,6,10,11) : FeCrNi, 8,9) ©: FeNiMn. 12) a model for discontinuous band propagation. In addition to the ones mentioned above, several reports have been made on the Lüders deformation in FeMn base steels.…”

“…Other reports have been also made on the Lüders deformation in FeCrNi base steels. 26,27) Recently, an FeNiMn base steel 12) has been reported to show similar mechanical behavior to FeNiAlC. Du et al 12) performed heat treatment at 300°C after cold rolling by 50% in Fe10Ni2Mn0.4C1.6Si and found that the specimen showed high strength and good elongation with Lüders strain of 8%.…”

“…26,27) Recently, an FeNiMn base steel 12) has been reported to show similar mechanical behavior to FeNiAlC. Du et al 12) performed heat treatment at 300°C after cold rolling by 50% in Fe10Ni2Mn0.4C1.6Si and found that the specimen showed high strength and good elongation with Lüders strain of 8%. Some other reports have been made on the mechanical behavior of this Fe10Ni2Mn0.4C1.6Si steel.…”