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Constitutive modeling for high temperature flow behavior of a high-strength manganese brass

高强锰黄铜高温热流变行为及本构方程的建立

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Abstract

The hot compressive deformation behaviors of ZHMn34-2-2-1 manganese brass are investigated on Thermecmastor-Z thermal simulator over wide processing domain of temperatures (923–1073 K) and strain rates (0.01–10 s–1). The true stress–strain curves exhibit a single peak stress, after which the stress monotonously decreases until a steady state stress occurs, indicating a typical dynamic recrystallization. The analysis of deviation between strain-dependent Arrhenius type constitutive and experimental data revealed that the material parameters (n, A, and Q) for the ZHMn34-2-2-1 manganese brass are not constants but varies as functions of the deformation conditions. A revised strain-independent sine hyperbolic constitutive was proposed, which considered the coupled effects of strain rate temperature and strain on material parameters. The correlation coefficient and the average absolute relative error are used to evaluate the accuracy of the established constitutive model. The quantitative results indicate that the proposed constitutive model can precisely characterize the hot deformation behavior of ZHMn34-2-2-1 manganese brass.

摘要

通过Thermecmastor-Z 热模拟试验机研究了ZHMn34-2-2-1 锰黄铜在温度为923~1073 K 和应变 速率为0.01~10 s–1 的加工范围内的热压缩变形行为。真应力–应变曲线显示随着应变增加应力达到峰 值, 随后单调递减达到稳态, 表现出明显的动态再结晶行为。将建立的基于应变补偿的Arrhenius 本 构模型预测结果和实验数据进行偏差分析, 结果表明在该本构模型中, ZHMn34-2-2-1 锰黄铜材料参 数(n, A and Q)随着变形条件的波动, 不能被简单地看作一组常数。随后提出了考虑变形条件对材料参 数耦合效应补偿的改进型本构模型。利用相关系数和平均绝对相对误差对已建立本构模型的精度进行 评价, 结果表明所提出的本构模型可以准确地描述ZHMn34-2-2-1 锰黄铜的热变形特性。

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Authors and Affiliations

  1. School of Material Science and Engineering, Chongqing University, Chongqing, 400044, China

    Meng-han Wang  (王梦寒), Kang Wei  (危康), Xiao-juan Li  (李小娟) & Ao-zhe Tu  (涂奥哲)

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  1. Meng-han Wang  (王梦寒)
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  2. Kang Wei  (危康)
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  3. Xiao-juan Li  (李小娟)
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  4. Ao-zhe Tu  (涂奥哲)
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Correspondence to Meng-han Wang  (王梦寒).

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Foundation item: Project(2012ZX04010-081) supported by the National Science and Technology Major Project of the Ministry of Science and Technology of China

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Wang, Mh., Wei, K., Li, Xj. et al. Constitutive modeling for high temperature flow behavior of a high-strength manganese brass. J. Cent. South Univ. 25, 1560–1572 (2018). https://doi.org/10.1007/s11771-018-3848-y

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  • DOI: https://doi.org/10.1007/s11771-018-3848-y

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