Ultralow-temperature superplasticity of high strength Fe–10Mn-3.5Si steel

Low-temperature superplasticity of Si-added medium-Mn steel

“…The ingots of Si-free and Si-added 10Mn steels were produced using an induction melting furnace with an Ar atmosphere. The actual chemical compositions of the steels were Fe-10.5Mn and Fe-10.6Mn-3.5Si (wt%), respectively [12]. After homogenization at 1373 K for 12 h, the ingots were hot-rolled at temperatures ranging from ~1373 K to 1273 K to ~4.0-mm-thick plates, and then aircooled to room temperature.…”

“…Superplastic materials have drawn significant attention due to high elongation prior to tensile failure, which makes them ideal for making complex-shaped mechanical parts without welding or joining. In particular, superplastic steels have been extensively studied due to low material and production costs, such as high-carbon steel [1][2][3], duplex stainless steel [4,5], high-specificstrength steel [6], and medium-Mn steel (MMS) [7][8][9][10][11][12]. However, their practical application is challenging due to their high superplastic deformation temperature (Ts) [7,9].…”

“…However, their practical application is challenging due to their high superplastic deformation temperature (Ts) [7,9]. To overcome the limitation, present authors reported a new Fe-10Mn-3.5Si steel [12], which exhibited superplasticity at 763 K with a strain rate (𝜀𝜀) of 1 × 10 -3 s -1 . The steel has a low material cost and can be produced using a conventional rolling process [12].…”

“…To overcome the limitation, present authors reported a new Fe-10Mn-3.5Si steel [12], which exhibited superplasticity at 763 K with a strain rate (𝜀𝜀) of 1 × 10 -3 s -1 . The steel has a low material cost and can be produced using a conventional rolling process [12]. Unlike previous superplastic materials with a dual-phase microstructure [7][8][9][10][11], the steel has a single-phase microstructure before plastic deformation [12].…”

“…The steel has a low material cost and can be produced using a conventional rolling process [12]. Unlike previous superplastic materials with a dual-phase microstructure [7][8][9][10][11], the steel has a single-phase microstructure before plastic deformation [12]. Additionally, after a superplastic forming simulation at 763 K, the steel possesses ultrahigh tensile strength (1336 MPa) at room temperature [12], which far exceeds the tensile strength of Al-added MMS (715 MPa) [9].…”