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Designing quadplex (four-phase) microstructures in an ultrahigh carbon steel

机译:在超高碳钢中设计四重(四相)微结构

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Here we present an approach to design a ferrite-based quadplex microstructure (ferrite/martensite/ carbide/austenite) using a lean alloyed Mn-Si-Cr-Al ultrahigh carbon steel. The material has 1500 MPa tensile strength and 11% elongation. The thermomechanical processing includes two main steps, namely, first, the formation of a ferrite plus carbide duplex microstructure by warm rolling below Ae_1; and second, annealing just above Ae_1 for a short time (~20 min). The quadplex microstructure consists of 57 vol% ultrafine ferrite (mean grain size ~1.5 μm), 29 vol% martensite, 12 vol% spherical carbide and 2 vol% austenite. Fracture analysis after tensile deformation reveals a mixed ductile and brittle failure mode without necking. Scanning electron microscopy (SEM), electron backscatter diffraction (EBSD) and dilatometry tests were conducted to map the microstructure characteristics and the contribution of each phase to the overall deformation.
机译:在这里,我们提出一种使用贫合金的Mn-Si-Cr-Al超高碳钢设计基于铁素体的四重组织(铁素体/马氏体/碳化物/奥氏体)的方法。该材料的抗拉强度为1500 MPa,伸长率为11%。热机械加工包括两个主要步骤,第一,通过在Ae_1以下进行热轧形成铁素体加碳化物的双相组织。第二,在短时间内(约20分钟)在Ae_1上方退火。四重组织由57%(体积)〜1.5μm的超细铁素体,29%(体积)的马氏体,12%(体积)的球形碳化物和2%(体积)的奥氏体组成。拉伸变形后的断裂分析表明,韧性和脆性混合破坏模式没有颈缩。进行了扫描电子显微镜(SEM),电子反向散射衍射(EBSD)和膨胀计测试,以绘制显微结构特征以及每个相对整体变形的贡献。

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