Thermally Activated Plastic Deformation Behavior of Nano Oxide Dispersion Strengthened Fe-18Cr Steel: Experiments and Analysis

R. Jarugula, S. Raman, G. Sundararajan
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引用次数: 8

Abstract

Abstract The objective of the present work is to investigate the ultra-high temperature (1273–1473 K) plastic deformation behavior of a nano oxide dispersion strengthened Fe-18Cr ferritic steel (n-ODS-18Cr steel) over a range of strain rates (10−2 to 10 s−1). The flow (true) stress-true strain behavior of this steel, reported for the first time, has been utilized to obtain the flow stress as a function of temperature and strain rate. From the above data, the strain rate sensitivity parameter (m) and also the activation volume have been obtained as a function of temperature (1273–1473 K). It is then demonstrated that the flow stress values obtained in the present steel over the temperature range 1273–1473 K is due to a single dominant strengthening mechanism, i.e. Orowan dispersion strengthening. Hence, the predictions of the theoretical models which assume Orowan strengthening as the dominant mechanism can be compared with the experimental flow stress data. Such a comparison indicates that the model due to Rosler and Arzt predicts the experimental data very well while the prediction of the model due to Brandes, Kovarik, Miller, Daehn and Mills is satisfactory. It is also shown that the experimentally obtained activation volume is consistent with the dislocation detachment model.
纳米氧化物弥散强化Fe-18Cr钢的热活化塑性变形行为:实验与分析
摘要本研究的目的是研究纳米氧化物弥散强化铁素体钢(n-ODS-18Cr钢)在应变速率(10−2 ~ 10 s−1)范围内的超高温(1273 ~ 1473 K)塑性变形行为。首次报道了这种钢的流动(真)应力-真应变行为,并利用该行为获得了流动应力作为温度和应变速率的函数。由上述数据可以得到应变速率敏感性参数m和活化体积随温度(1273 ~ 1473 K)的变化规律,从而证明在1273 ~ 1473 K温度范围内,现有钢的流动应力值是由单一的强化机制,即Orowan弥散强化所导致的。因此,假设Orowan强化为主要机制的理论模型的预测结果可以与实验流变应力数据进行比较。这样的比较表明,由于Rosler和Arzt的模型预测实验数据很好,而由于Brandes, Kovarik, Miller, dahn和Mills的模型预测是令人满意的。实验得到的活化体积符合位错脱离模型。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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