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首页> 外文期刊>Materials Characterization >Evolution of ultrafine grained microstructure and nano-sized semi-coherent oxide particles in austenitic oxide dispersion strengthened steel
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Evolution of ultrafine grained microstructure and nano-sized semi-coherent oxide particles in austenitic oxide dispersion strengthened steel

机译：奥氏体氧化物弥散强化钢中超细晶粒组织和纳米级半相干氧化物颗粒的演变

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Ultrafine grained austenitic oxide dispersion strengthened steel was prepared by mechanical alloying of the elemental metal powders and Y2O3 powders, then by hot isostatic pressing, hot rolling and solution annealing. The average grain size of the sample was about 260 nm, and the grain structure was stable after isothermal heat treatment at 1150 degrees C (similar to 0.8 T-m) for 1000 h. The high thermal stability of the grain structure is mainly attributed to the uniformly dispersed semi-coherent Y2Ti2O7 particles of about 5 nm in diameter. The particles appear to have a strong pinning effect on grain boundaries due to the semi-coherent interface character between particles and the matrix at 1150 degrees C. A decrease of the number density of Y2Ti2O7 particles and coarsening of the particles on the grain boundaries was observed during heat treatments at 1200 degrees C and 1250 degrees C, resulting in a steady grain growth at these temperatures. (C) 2016 Elsevier Inc. All rights reserved.
机译：通过将元素金属粉末和Y2O3粉末机械合金化，然后通过热等静压，热轧和固溶退火，制备出超细晶粒奥氏体氧化物弥散强化钢。样品的平均晶粒尺寸为约260 nm，在1150摄氏度（约0.8 T-m）下等温热处理1000 h后，晶粒结构稳定。晶粒结构的高热稳定性主要归因于直径约5 nm的均匀分散的半相干Y2Ti2O7颗粒。由于在1150摄氏度时颗粒与基体之间的半相干界面特性，颗粒似乎对晶界具有很强的钉扎作用。观察到Y2Ti2O7颗粒数密度的降低和颗粒在晶界上的变粗在1200摄氏度和1250摄氏度进行热处理时，在这些温度下晶粒稳定生长。 （C）2016 Elsevier Inc.保留所有权利。

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