Influence of Machine Stiffness on the Portevin–Le Chatelier Effect of Ti-12Mo Alloy Based on a Modified McCormick Constitutive Model

IF 3.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Metals and Materials International Pub Date : 2024-04-13 DOI:10.1007/s12540-024-01669-x

Shiyuan Luo, Liang Xiao, Jun Jiang, Jia Li, Liangcai Zeng

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Abstract

An improved 3D FE model, considering machine stiffness effect and strain dependent parameters in an embedded modified McCormick’s constitutive model, is developed to numerically investigate the spatiotemporal characteristics of the PLC effect in Ti-12Mo alloy tensile tests. The material parameters of the modified McCormick’s model are calibrated in details, and the simulated results are compared with experiment and literature ones. Then, the influence of machine stiffness on the spatiotemporal behaviors of the PLC effect in Ti-12Mo alloy are quantitatively analyzed. The results show that the improved FE model has a higher simulation accuracy in term of stress drop frequency. Moreover, the average stress drop magnitude decreases and the number of stress drops increases with the increase of machine stiffness, which are mainly owing to the decrease of aging time. Furthermore, the PLC band width decreases as increasing machine stiffness, which is attributed to the decrease of driving force for band nucleation. Besides, the continuous and hopping propagations of the PLC band are observed, and the propagation continuity obviously increases as increasing machine stiffness, which is mainly related to the increase of spatial coupling force.

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基于修正的麦考密克构造模型的机器刚度对 Ti-12Mo 合金波特文-勒夏特列效应的影响

在嵌入式改进麦考密克构成模型中考虑了机器刚度效应和应变相关参数，开发了一种改进的三维有限元模型，用于数值研究钛-12Mo 合金拉伸试验中 PLC 效应的时空特征。详细标定了修正麦考密克模型的材料参数，并将模拟结果与实验和文献结果进行了比较。然后，定量分析了机器刚度对 Ti-12Mo 合金 PLC 效应时空行为的影响。结果表明，改进后的 FE 模型在应力下降频率方面具有更高的模拟精度。此外，随着机器刚度的增加，平均应力滴幅度减小，应力滴数量增加，这主要是由于时效时间的缩短。此外，PLC 带宽随着机器刚度的增加而减小，这是由于带核形成的驱动力减小所致。此外，还观察到 PLC 带的连续和跳跃传播，传播连续性随着机器刚度的增加而明显增加，这主要与空间耦合力的增加有关。

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来源期刊

Metals and Materials International 工程技术-材料科学：综合

CiteScore

7.10

自引率

8.60%

发文量

197

审稿时长

3.7 months

期刊介绍： Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.