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Strengthening mechanisms of different oxide particles in 9Cr ODS steel at high temperatures

机译：高温下9Cr ODS钢中不同氧化物颗粒的强化机理

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摘要

The influence of different oxide particles on deformation mechanisms of 9Cr ODS steels at temperatures 400–600 °C is tested. Two ODS variants with Al2O3and Y2O3dispersed particles respectively and one variant without particles have been prepared by powder metallurgy. The deformation mechanisms are investigated by the tensile and stress-relaxation test at temperatures 400 °C and 600 °C. The analysis is based on a comparison of athermal and thermal stress components of the flow stress, apparent activation volume and a strain rate hardening. Microstructural parameters are evaluated upon SEM and TEM observations. The contributions of different strengthening mechanisms are assessed using the Taylor, Hall-Petch, dispersed barrier and Orowan models. Alumina particles provide the highest strengthening which can be explained by the stress decrease around the particles induced by a high difference between Young's moduli of alumina and ferritic matrix. This stress field can trap the dislocation in the vicinity of particles. Due to this stress decrease, alumina particles provide strengthening even at 600 °C in contrast to yttria particles that lose their effect due to their overcoming by a non-conservative motion of dislocations.
机译：测试了在400–600 C的温度下不同氧化物颗粒对9Cr ODS钢变形机制的影响。通过粉末冶金已经制备了两种分别具有分散有Al 2 O 3和Y 2 O 3的颗粒的ODS变体和一种没有颗粒的ODS变体。通过在400 stressC和600 C的温度下的拉伸和应力松弛试验研究了变形机理。该分析基于流应力的非热应力分量和热应力分量，表观活化体积和应变速率硬化的比较。通过SEM和TEM观察评估微结构参数。使用泰勒（Taylor），霍尔-帕奇（Hall-Petch），分散屏障和Orowan模型评估了不同强化机制的贡献。氧化铝颗粒提供了最高的强度，这可以解释为由于杨氏模量与铁素体基体之间的高差异而引起的颗粒周围应力降低。该应力场可将位错捕获在颗粒附近。由于这种应力的降低，氧化铝颗粒甚至在600 C时也能提供增强作用，而氧化钇颗粒则由于位错的非保守运动而克服了作用而失去了作用。

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