Abstract A novel, lightweight Fe-25.7Mn-10.6Al-1.2C (wt.%) steel is designed by exploiting the concurrent progress of primary recrystallization and phase transformation, in order to produce an ultrafine-grained, duplex microstructure. The microstructure consists of recrystallized austenite grains surrounded by submicron-sized ferrite grains, and recovered austenite regions with preferential nano-κ-carbide precipitation. This partially recrystallized duplex microstructure demonstrates excellent strength-ductility combinations, e.g. a yield strength of 1251 MPa, an ultimate tensile strength of 1387 MPa, and a total elongation of 43%, arising from the composite response by virtue of diverging constituent strength and strain hardening behaviors.

中文翻译：

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通过调整相变和再结晶动力学设计双相超细晶粒 Fe-Mn-Al-C 钢

摘要 利用一次再结晶和相变的同时进行，设计了一种新型轻质 Fe-25.7Mn-10.6Al-1.2C (wt.%) 钢，以产生超细晶双相显微组织。显微组织由亚微米尺寸的铁素体晶粒包围的再结晶奥氏体晶粒和具有优先纳米κ-碳化物沉淀的恢复奥氏体区域组成。这种部分再结晶的双相微观结构表现出优异的强度-延展性组合，例如屈服强度为 1251 MPa，极限抗拉强度为 1387 MPa，总伸长率为 43%，这是由于发散成分强度和应变硬化产生的复合响应行为。