Plastic anisotropy in pearlite: A molecular dynamics study with insights from the periodic bicrystal model

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Acta Materialia Pub Date : 2025-05-21 DOI:10.1016/j.actamat.2025.121100

Kai Liu , Fei Shuang , Marcel H.F. Sluiter

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引用次数: 0

Abstract

Cold-drawn pearlite wire is widely used in industry due to its exceptional high strength. Understanding the deformation mechanisms during the cold-drawing process of pearlite, particularly the deformation and decomposition of cementite, is of great significance. In this study, a bicrystal model tailored to lamellar structures is developed to calculate the elastic properties and stress concentration of pearlite. By analyzing slip activation in both ferrite and cementite, along with the yield strength, we reveal the significant influence of loading direction on pearlite deformability. Notably, the yield strength varies from 9.5 GPa to 17.0 GPa. Under specific loading conditions, plastic deformation is observed to initiate in cementite, challenging the conventional assumption that slip bands always originate in ferrite. Furthermore, factors that influence the plastic deformation of pearlite are discussed. A successive strengthening mechanism is proposed to explain the excellent deformability and high strength of pearlite after extensive deformation.

This work introduces a novel method for directional loading of lamellar structures. The surprising finding that plastic deformation, without fracture, can initiate in cementite, might offer directions for developing other structural materials with extreme tensile strength and deformability.

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珠光体的塑性各向异性：周期性双晶模型的分子动力学研究

冷拔珠光体线材因其超高的强度在工业上得到了广泛的应用。了解珠光体在冷拔过程中的变形机理，特别是渗碳体的变形和分解具有重要意义。本研究建立了一种适合于层状结构的双晶模型，用于计算珠光体的弹性特性和应力集中。通过分析铁素体和渗碳体的滑移激活以及屈服强度，揭示了加载方向对珠光体变形能力的显著影响。值得注意的是，屈服强度在9.5 ~ 17.0 GPa之间变化。在特定的加载条件下，观察到塑性变形始于渗碳体，挑战了滑移带总是起源于铁素体的传统假设。讨论了影响珠光体塑性变形的因素。珠光体在大变形后具有优异的变形性能和较高的强度，提出了一种连续强化机制。本文介绍了一种新的板层结构定向加载方法。这一令人惊讶的发现，即塑性变形可以在渗碳体中开始，而不发生断裂，这可能为开发其他具有极端抗拉强度和变形能力的结构材料提供方向。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Acta Materialia 工程技术-材料科学：综合

CiteScore

16.10

自引率

8.50%

发文量

801

审稿时长

53 days

期刊介绍： Acta Materialia serves as a platform for publishing full-length, original papers and commissioned overviews that contribute to a profound understanding of the correlation between the processing, structure, and properties of inorganic materials. The journal seeks papers with high impact potential or those that significantly propel the field forward. The scope includes the atomic and molecular arrangements, chemical and electronic structures, and microstructure of materials, focusing on their mechanical or functional behavior across all length scales, including nanostructures.