冷拉珠光体钢丝显微组织和 Fe/Fe3C 界面结构的演变,Steel Research International

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冷拉珠光体钢丝显微组织和 Fe/Fe3C 界面结构的演变
Steel Research International ( IF 1.9 ) Pub Date : 2024-01-04 , DOI: 10.1002/srin.202300556
Xu Yang ₁ , Siqian Bao ₁ , Xiaolong Kang ₁ , Jiarui Hu ₁ , Chen Liu ₁ , Renmin Tian ₁

Affiliation

通过扫描电子显微镜（SEM）、电子背散射衍射（EBSD）和透射电子显微镜（TEM）研究了冷拉珠光体钢丝的显微组织、织构和位错配置。此外，通过高分辨率TEM（HRTEM）清晰地观察和分析了原子水平的Fe/Fe ₃ C界面结构，揭示了渗碳体片层在不同拉拔应变下的微观变形机制。结果表明，珠光体片层转向拉拔方向形成铁素体<110>纤维织构，且随着拉拔应变的增加，渗碳体和铁素体片层同时变薄。冷拔过程中，渗碳体片层中形成剪切带（S带）；铁素体位错由单滑移阶段过渡到多滑移阶段，位错密度增大。拉拔后，渗碳体和铁素体相的晶格结构呈现出由单晶向多晶的演变，渗碳体片层分为多层结构：中心为较大尺寸的渗碳体晶体，外侧为较小尺寸的渗碳体晶体层；某些区域渗碳体片层的溶解导致铁素体相的晶格膨胀，并在渗碳体片层中出现颈缩区域。

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Evolution of Microstructure and Fe/Fe3C Interface Structure in Cold-Drawn Pearlitic Steel Wires

The microstructure, texture, and dislocation configuration of cold-drawn pearlitic steel wires were investigated by scanning electron microscopy (SEM), electron backscattering diffraction (EBSD), and transmission electron microscopy (TEM). In addition, Fe/Fe₃C interface structure at the atomic level was clearly observed and analyzed by high-resolution TEM (HRTEM), and the microscopic deformation mechanism of cementite lamellae at different drawing strains is revealed. The results show that pearlite lamellae turn to the drawing direction to form ferrite <110> fiber texture, and the cementite and ferrite lamellae are simultaneously thinned with the increase of drawing strain. During the cold drawing process, shear-bands(S-bands) are formed in the cementite lamellae; the dislocation of ferrite transits from single slip to multi-slip stage, and the dislocation density increases. After drawing, the lattice structures of cementite and ferrite phases show the evolution from single-crystal to polycrystal, and the cementite lamellae are divided into a multilayer structure: central relative large-size cementite crystal and outside relative small-size cementite crystal layer; the dissolution of cementite lamellae in some regions results in the lattice expansion of ferrite phase and the occurrence of neck-down regions in the cementite lamellae.

更新日期：2024-01-04

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