AISI 420钢微尺度应变局部化耦合dic -晶塑性研究

IF 9.4 1区 工程技术 Q1 ENGINEERING, MECHANICAL
Yadong Zhou, Kegu Lu, Redmer van Tijum, Maysam Naghinejad, Yutao Pei, Jan Post
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引用次数: 0

摘要

本研究采用基于扫描电子显微镜的数字图像相关(SEM-DIC)、电子背散射衍射(EBSD)和晶体塑性(CP)建模的综合方法,研究了铁素体AISI 420不锈钢的微尺度应变局部化和滑移活动。本研究的一个新颖方面是多步SEM-DIC与CP建模的直接耦合,将实验应变场与模拟滑移活动联系起来。微观组织由铁素体晶粒和分散的碳化物组成,表现出早期应变局部化,随着整体应变的增加,这种局部化加剧,最终形成相互连接的剪切带。统计分析表明,局部形变不是由晶粒尺寸、晶界取向偏差、最大施密德因子或碳化物效应等单一微观结构参数引起的,而是由多种约束条件的综合影响引起的。具体来说,滑移传递在错向晶界处的几何取向不佳,铁素体晶界与碳化物之间的滑移路径受限,以及小晶粒中有限的变形容纳,共同促进了应变局部化。为了进一步分析滑移传递条件,引入了累积剪切方法,通过整合多步DIC测量的加载历史来识别主要滑移系统,从而可以与相应的cp模型变量进行直接比较。该方法克服了基于速度梯度方法的瞬态局限性,提供了一种更可靠的评估滑动活动性的方法。此外,基于DIC感兴趣区域(ROI)微观结构的CP模型揭示了微尺度下的局部应力非均质性。这项工作为铁素体不锈钢的微尺度应变局部化机制提供了见解,并强调了微观结构特征在触发局部变形行为中的关键作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Coupled DIC-crystal plasticity study of microscale strain localization in AISI 420 steel
This work investigates microscale strain localization and slip activity in ferritic AISI 420 stainless steel using an integrated approach of scanning electron microscopy-based digital image correlation (SEM-DIC), electron backscatter diffraction (EBSD), and crystal plasticity (CP) modeling. A novel aspect of this study is the direct coupling of multi-step SEM-DIC with CP modeling to link experimental strain fields with simulated slip activity. The microstructure, consisting of ferritic grains with finely dispersed carbides, exhibits early strain localization that intensifies under increasing global strain, ultimately forming interconnected shear bands. Statistical analyses indicate that localized deformation does not arise from any single microstructural parameter, such as grain size, grain boundary misorientation, maximum Schmid factor, or carbides’ effect, but rather from the combined influence of multiple constraints. Specifically, poor geometrical alignment of slip transfer at misaligned grain boundaries, restricted slip paths between ferrite grain boundaries and carbides, and limited deformation accommodation in smaller grains collectively promote strain localization. To further analyze slip transfer conditions, an accumulated-shear methodology is introduced to identify the dominant slip systems by integrating the loading history from multi-step DIC measurements, thereby enabling direct comparison with the corresponding CP-modeled variables. This method overcomes the transient limitations of velocity-gradient-based methods and provides a more reliable means of evaluating slip activity. Additionally, a CP model based on the DIC region of interest (ROI) microstructure reveals local stress heterogeneities at the microscale. This work offers insights into the mechanisms of microscale strain localization in ferritic stainless steel and highlights the critical role of microstructural features in triggering local deformation behavior.
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来源期刊
International Journal of Mechanical Sciences
International Journal of Mechanical Sciences 工程技术-工程:机械
CiteScore
12.80
自引率
17.80%
发文量
769
审稿时长
19 days
期刊介绍: The International Journal of Mechanical Sciences (IJMS) serves as a global platform for the publication and dissemination of original research that contributes to a deeper scientific understanding of the fundamental disciplines within mechanical, civil, and material engineering. The primary focus of IJMS is to showcase innovative and ground-breaking work that utilizes analytical and computational modeling techniques, such as Finite Element Method (FEM), Boundary Element Method (BEM), and mesh-free methods, among others. These modeling methods are applied to diverse fields including rigid-body mechanics (e.g., dynamics, vibration, stability), structural mechanics, metal forming, advanced materials (e.g., metals, composites, cellular, smart) behavior and applications, impact mechanics, strain localization, and other nonlinear effects (e.g., large deflections, plasticity, fracture). Additionally, IJMS covers the realms of fluid mechanics (both external and internal flows), tribology, thermodynamics, and materials processing. These subjects collectively form the core of the journal's content. In summary, IJMS provides a prestigious platform for researchers to present their original contributions, shedding light on analytical and computational modeling methods in various areas of mechanical engineering, as well as exploring the behavior and application of advanced materials, fluid mechanics, thermodynamics, and materials processing.
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