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Modeling of flow stress of bainitic and martensitic functionally graded steels under hot compression

机译：贝氏体和马氏体功能梯度钢在热压下的流动应力建模

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In the present paper, hot deformation behaviour of functionally graded steels (FGSs) is investigated by means of hot compression tests at different temperatures and strain rates. Functionally graded steels (FGSs) consist of ferrite (α), austenite (γ), bainite (β) and martensite (M) co-existing in different configurations and produced via electroslag remelting (ESR). Zener-Hollomon parameter (Z-H equation) is evaluated to describe the mean flow stress of FGSs (with α β γ and γMγ structures) as a function of temperature and strain rate. The values of stress power (n) and activation energy (Q) are also determined. A new analytical model is developed to determine the flow stress under hot deformation behaviour. The model considers a phase mixture law and boundary layers properties which are obtained by experimental investigation on single phase materials. Finally, the values assessed by using the new analytical frames are compared with those obtained from new experimental tests and a sound agreement is found.
机译：本文通过在不同温度和应变速率下的热压缩试验研究了功能梯度钢（FGSs）的热变形行为。功能梯度钢（FGS）由铁素体（α），奥氏体（γ），贝氏体（β）和马氏体（M）共存，并以不同的形态存在，并通过电渣重熔（ESR）生产。评估了齐纳-所罗门参数（Z-H方程）以描述FGS（具有αβγ和γMγ结构）的平均流动应力随温度和应变率的变化。还确定了应力功率（n）和活化能（Q）的值。开发了一种新的分析模型来确定热变形行为下的流动应力。该模型考虑了通过对单相材料进行实验研究而获得的相混合定律和边界层性质。最后，将通过使用新的分析框架评估的值与从新的实验测试获得的值进行比较，并找到合理的一致性。

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