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Modeling of the high temperature flow behavior of stabilized 12-27 wt% Cr ferritic stainless steels

机译：稳定的12-27 wt％Cr铁素体不锈钢的高温流动行为建模

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摘要

Constitutive equations and a flow stress model for the hot deformation of stabilized ferritic stainless steels with Cr contents between 12 and 27 wt% have been developed. The equations are based on compression tests in a Gleeble thermomechanical simulator to the strain of 0.4 at temperatures of 950-1050 ℃ at the strain rates of 0.01,0.1 and 1 s~(-1). A pronounced influence of dynamic recovery on the flow curves of all steels was evident. In the constitutive equations, the activation energy for deformation decreased systemically from 359 kJ/mol to 329 kJ/mol as the Cr content increased from 12 to 27 wt%, and the interpretation of this peculiarity is discussed. A flow stress model developed, based on dislocation density, was found to predict quite accurately the experimental flow curves at the deformation temperatures and strain rates applied. Also reasonable values for dislocation densities could be evaluated from the model. The strain independent work-hardening parameter, U, which is a measure of the rate of dislocation immobilization, and the initial flow stress σ_O were found to be dependent on the deformation conditions and the Cr content. In contrast, the recovery parameter, Ω, which represents the remobilization of immobile dislocations, was found to be independent of the Cr content.
机译：已经建立了Cr含量在12至27 wt％之间的稳定铁素体不锈钢热变形的本构方程和流动应力模型。该方程基于在Gleeble热力学模拟器中的压缩测试，在950-1050℃的温度下以0.01、0.1和1 s〜（-1）的应变速率下的0.4应变。动态恢复对所有钢的流动曲线都有明显的影响。在本构方程中，随着Cr含量从12 wt％增加到27 wt％，变形的活化能从359 kJ / mol整体降低到329 kJ / mol，并讨论了这种特殊性的解释。发现基于位错密度开发的流动应力模型可以非常准确地预测在变形温度和施加的应变速率下的实验流动曲线。也可以从模型评估位错密度的合理值。发现应变无关的加工硬化参数U是位错固定率的度量，初始流动应力σ_O取决于变形条件和Cr含量。相比之下，发现恢复参数Ω代表了固定位错的重新迁移，与铬含量无关。

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