Enhanced Mechanical Properties of Fe-Mn-Al-C Low Density Steel via Aging Treatment

作者：Kang Li, Hao Yuan, Huaying Li, Yafeng Ji, Hai-tao liu, Guangming Liu · 发表于：Frontiers in Materials · 年份：2021 · DOI：10.3389/fmats.2021.680776 · 被引用次数：15 · 研究领域：Microstructure and Mechanical Properties of Steels、Metal Alloys Wear and Properties、Metallurgy and Material Forming

This study investigated the tensile properties and deformation behavior of an aged Fe-26Mn-6Al-1C (mass%) alloy with a stacking fault energy of approximately 60 mJ·m −2 . The results show that an ordered phase with a “short-range ordering” (SRO) structure formed after aging at 550°C for 10 h, further increasing the aging time to 48 h. Lamellar second-phase precipitates appeared at the austenitic grain boundaries. The aged sample at 550°C for 10 h exhibited an enhanced tensile strength (∼898 MPa) without notably sacrificing uniform elongation (∼46.3%), which was mainly attributed to the relatively high strain hardening in the entire plastic deformation due to the synergistic effects of planar slip, twinning-induced plasticity (TWIP), microband-induced plasticity (MBIP), and especially the formation of short-range ordering.