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首页> 外文期刊>Journal of Materials Engineering and Performance >Constitutive Modeling During Simultaneous Forming and Quenching of a Boron Bearing Steel at High Temperatures
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Constitutive Modeling During Simultaneous Forming and Quenching of a Boron Bearing Steel at High Temperatures

机译：含硼轴承钢高温同时成形和淬火过程中的本构模型

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摘要

Simulation of hot stamping process needs reliable material data, especially at high temperatures where plastic deformation takes place in austenitic microstructure. In the current study, high-temperature non-isothermal compression tests (NICT) at different ranges of temperature, strain and strain rate as well as constitutive modeling of the flow curves were carried out. The Johnson-Cook and the Nemat-Nasser phenomenological models for isothermal deformation conditions were revised and applied to fit the flow curves during high-temperature NICT. It was shown that the models can satisfactorily predict the material flow stress at the mentioned conditions. Furthermore, the models were employed in order to describe the work-hardening behavior of the material. The results indicated that the fitted work-hardening rate can successfully follow the experimental data during deformation till no strain-induced phase transformation is initiated.
机译：热冲压过程的仿真需要可靠的材料数据，尤其是在奥氏体微结构中发生塑性变形的高温下。在当前的研究中，进行了在不同温度，应变和应变率范围内的高温非等温压缩试验（NICT）以及流动曲线的本构模型。修订了等温变形条件的Johnson-Cook和Nemat-Nasser现象学模型，并将其应用于高温NICT过程中的流量曲线。结果表明，该模型可以较好地预测所述条件下的材料流动应力。此外，使用模型来描述材料的加工硬化行为。结果表明，拟合的加工硬化率可以成功地遵循变形期间的实验数据，直到没有应变引起的相变开始。

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