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首页> 外文期刊>Journal of Materials Engineering and Performance >Microstructure Characteristics and Comparative Analysis of Constitutive Models for Flow Stress Prediction of Inconel 718 Alloy
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Microstructure Characteristics and Comparative Analysis of Constitutive Models for Flow Stress Prediction of Inconel 718 Alloy

机译：弹性应力预测本构模型的组织特性及比较分析

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摘要

An accurate constitutive model is essential for analyzing deformation behavior of material and reliable numerical simulations in metal forming processes. In this study, hot tensile tests of Inconel 718 alloy have been conducted over a wide range of temperatures (300-973K at an interval of 100K), strains (0.01-0.3 at an interval of 0.01) and quasi-static strain rates (0.0001, 0.001, 0.01s(-1)). Flow stress behavior is significantly affected by test temperatures and strain rates. Microstructure characteristics of deformed test specimens have been examined using scanning electron microscope and electron backscatter diffraction (EBSD). The fractography study revealed that fracture is mix-mode type, i.e., ductile and brittle. Subsequently, EBSD analysis shown that dynamic recrystallization mechanism is more pronounced at a higher temperature. Furthermore, four constitutive models, namely modified Cowper-Symonds, modified Johnson Cook, modified Zerillie-Armstrong and integrated Johnson Cook-Zerillie-Armstrong (JC-ZA) models have been investigated for flow stress prediction. Capability of models has been evaluated based on the correlation coefficient (R), average absolute error (Delta) and its standard deviation (delta). Accurate prediction of flow stress behavior is found by integrated JC-ZA model with R=0.9873, Delta=2.44 and delta=4.08%.
机译：精确的本构模型对于分析材料的变形行为是必不可少的，以及金属形成过程中可靠的数值模拟。在该研究中，Inconel 718合金的热拉伸试验已经在宽范围内（间隔为100k），菌株（0.01-0.3的间隔为0.01）和准静态应变率（0.0001 ，0.001,0.01s（-1））。通过测试温度和应变速率的流动应力行为显着影响。使用扫描电子显微镜和电子反向散射衍射（EBSD）检查了变形试样的微观结构特性。 Fractography研究表明，断裂是混合模式型，即延性和脆性。随后，EBSD分析表明，动态再结晶机制在较高温度下更明显。此外，已经研究了四个本构模型，即修改过的Cowper-Symonds，修改了Johnson Cook，改进的Zerillie-Armstrong和集成的Johnson Cook-Zerillie-Armstrong（JC-ZA）模型进行了流量预测。基于相关系数（R），平均绝对误差（Delta）及其标准偏差（Delta）来评估模型的能力。通过集成的JC-ZA模型，r = 0.9873，delta = 2.44和delta = 4.08％，通过集成的JC-ZA模型发现了对流应力行为的精确预测。

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