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首页> 外文期刊>Journal of Materials Engineering and Performance >Prediction of Forming Limit Curves from Hardness for Steels
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Prediction of Forming Limit Curves from Hardness for Steels

机译：从钢的硬度预测极限曲线

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This paper presents a method for predicting the strain-based forming limit curve (FLC) for steels using hardness. The stretching side (positive minor strain component) of the FLC was calculated by using a Marciniak-KuczyA"ski model with a non-quadratic yield function, while the drawing side (negative minor strain component) of the FLC was predicted based on the relationship between the major and minor critical strains, in accordance with the theory of maximum sheet tension for local necking. The requisite parameter that describes the plastic flow behavior (in this case, the strain hardening exponent) was calculated, based on correlations with the measured microhardness. Additionally, the strain rate sensitivity was considered in the model by using a newly developed empirical correlation between hardness and strain rate sensitivity. This hardness-based model was used to predict FLCs that demonstrate good agreement with experimental FLCs of a high-strength low-alloy steel and a dual-phase steel. Equations are provided that enable the calculation of the FLC from given hardness values for different severities of the material inhomogeneity.
机译：本文提出了一种使用硬度预测钢的基于应变的成形极限曲线（FLC）的方法。通过使用具有非二次屈服函数的Marciniak-KuczyA“ ski模型来计算FLC的拉伸侧（正小应变分量），而基于该关系预测FLC的拉伸侧（负小应变分量）根据局部颈缩的最大薄板张拉力理论，确定主要和次要临界应变之间的关系，并根据与测得的显微硬度的相关性，计算出描述塑性流动行为的必要参数（在这种情况下为应变硬化指数）此外，通过使用新开发的硬度与应变速率敏感性之间的经验相关性，在模型中考虑了应变速率敏感性，该基于硬度的模型用于预测FLC，这些FLC与高强度低强度实验FLC表现出良好的一致性。合金钢和双相钢提供的方程式可以根据给定的硬度值，针对不同的硬度来计算FLC物质均质性的真实性。

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