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首页> 外文期刊>Materials Science and Engineering >Evaluation of local strength via microstructural quantification in a pearlitic rail steel deformed by simultaneous compression and torsion
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Evaluation of local strength via microstructural quantification in a pearlitic rail steel deformed by simultaneous compression and torsion

机译：通过同时压缩和扭转变形的珠光体钢的显微组织定量评估局部强度

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摘要

Pearlitic steels are commonly used for railway rails because they combine good strength and wear properties. During service, the passage of trains results in large accumulation of shear strains in the surface layer of the rail, sometimes leading to crack initiation. Knowledge of the material properties versus the shear strain in this layer is therefore important for fatigue life predictions. In this study, fully pearlitic R260 rail steel was deformed using a bi-axial torsion-compression machine to reach different shear strains. Microstructural parameters including interlamellar spacing, thickness of ferrite and cementite lamellae and dislocation density in the ferrite lamellae, as well as hardness were quantitatively characterized at different shear strain levels. Based on the microstructural observations and the quantification of the microstructural parameters, the local flow stresses were estimated based on boundary strengthening and dislocation strengthening models. A good agreement was found between the estimated flow stresses and the flow stresses determined from microhardness measurements.
机译：珠光体钢由于其良好的强度和耐磨性而通常用于铁路轨道。在使用过程中，列车的通过导致在铁路表层的大量剪切应变积累，有时会导致裂纹萌生。因此，了解材料特性与该层中的剪切应变对预测疲劳寿命很重要。在这项研究中，全珠光体R260轨道钢使用双轴扭转压缩机变形以达到不同的剪切应变。在不同的剪切应变水平下，定量表征了层间间距，铁素体和渗碳体薄片的厚度以及铁素体薄片中位错密度以及硬度的微观结构参数。基于微观结构观察和微观结构参数的量化，基于边界强化和位错强化模型估算了局部流动应力。在估算的流动应力与通过显微硬度测量确定的流动应力之间找到了很好的一致性。

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