利用晶体塑性和基于方差的全局灵敏度分析探讨双相钢的组织-性能关系

IF 7.9 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Niklas C. Fehlemann, Irene Biermann, Sebastian Münstermann
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引用次数: 0

摘要

本研究提出了一个新的框架,通过高保真三维sRVE模拟来量化DP800钢的微观组织特征与损伤机制之间的关系,该模拟具有新的损伤指标,并将基于方差的全局灵敏度分析与Sobol指数的计算相结合。所建立的方法表明,马氏体与铁素体相比对损伤容限的影响大于马氏体强度,而马氏体伸长率是马氏体断裂的主要参数。对于新引入的相界脱黏指标,两相晶粒尺寸的影响最大。整体损伤抗力的均质化指标和两种损伤机制的权衡进一步揭示了相形态的重要性,提供了对单个机制未捕获的其他影响因素的见解。收敛分析证实,200-250个数据点足以稳定地确定Sobol指数,不同的代理建模方法也证实了这一点。雷达图分析表明,增强损伤容限的最佳组织是由两相中少量的强马氏体和细小的球状晶粒组成,这与已有的关于DP钢的知识一致。该方法为未来优化微结构和加载路径,提高复杂成形条件下的损伤容忍度奠定了有效基础。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Exploring structure–property relations in dual phase steels using crystal plasticity and variance based global sensitivity analysis
This study presents a novel framework to quantify the relationships between microstructural features and damage mechanisms in DP800 steel through high-fidelity three-dimensional sRVE simulations with novel damage indicators, which were integrated with variance-based global sensitivity analysis for the calculation of Sobol indices. The developed methodology suggests that the martensite-to-ferrite phase ratio has a stronger impact on damage tolerance than martensite strength, while the elongation of martensite is the dominant parameter for martensite fracture. For the newly introduced phase boundary decohesion indicator, the grain sizes of both phases exhibit the highest influence. A homogenized indicator for overall damage resistance and a trade-off for the two damage mechanisms further revealed the importance of phase morphology, providing insights into additional influencing factors not captured by individual mechanisms. Convergence analyses confirmed that 200–250 datapoints suffice for stable determination of the Sobol indices, confirmed by different surrogate modeling approaches. Radar chart analyses indicated that optimal microstructures for enhanced damage tolerance consist of smaller fractions of strong martensite combined with fine, spheroidal grains in both phases, aligning with established knowledge on DP steels. This approach establishes a validated basis for future optimization of microstructures and loading paths to improve damage tolerance under complex forming conditions.
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来源期刊
Materials & Design
Materials & Design Engineering-Mechanical Engineering
CiteScore
14.30
自引率
7.10%
发文量
1028
审稿时长
85 days
期刊介绍: Materials and Design is a multi-disciplinary journal that publishes original research reports, review articles, and express communications. The journal focuses on studying the structure and properties of inorganic and organic materials, advancements in synthesis, processing, characterization, and testing, the design of materials and engineering systems, and their applications in technology. It aims to bring together various aspects of materials science, engineering, physics, and chemistry. The journal explores themes ranging from materials to design and aims to reveal the connections between natural and artificial materials, as well as experiment and modeling. Manuscripts submitted to Materials and Design should contain elements of discovery and surprise, as they often contribute new insights into the architecture and function of matter.
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