Microstructure and Mechanical Property of Strip in Fe–23Mn–3Si–3Al TWIP Steel by Twin Roll Casting
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概要
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Strip in TWIP steel with the composition of Fe–23Mn–3Si–3Al fabricated by twin-roll strip casting was investigated. Large edge cracks, which were prone to occur in hot rolled TWIP steels, were avoided by using twin-roll strip casting. The cold rolled and annealed strip exhibited a reasonably good combination of strength and ductility after annealing at 1373 K for 20 min, with the tensile strength and elongation being 655 MPa and 57.4%, respectively, with the elongation of cast strip being 80% that of the conventional processed counterpart. Fine grain structure formed in cast strip increased the critical resolved shear stress (CRSS) of twinning and suppressed the generation of deformation twins during plastic deformation to make less contribution to the total elongation.
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