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Microstructures and tensile properties of an austenitic ODS heat resistance steel

机译：奥氏体ODS耐热钢的组织和拉伸性能

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摘要

In this study, an austenitic oxide dispersion strengthened (ODS) heat resistance steel with added Y2O3 is fabricated by process of mechanical alloying (MA) and hot isostatic pressing (HIP). The proceeded steel exhibits an ultrafine-grained (UFG) microstructure with a bimodal grain size distribution. Numerous nano particles located inside the grains are precipitated with an average size of 8.77 nm. Most particles exhibit a gathering structure with the Y-rich phase wrapped around the Cu-rich phase. The Y-rich phase is identified as Y2O3 that is semi coherent with the austenitic matrix. The existence of the Cu-rich phase is favorable for the Y2O3 precipitation. Mechanical properties tests at RT and 650 degrees C reveal a great improvement in strengths over the commercial Super304H austenitic heat resistance steel due to the presence of the ultrafine grains and numerous oxide nano particles. The higher tensile strength makes this austenitic ODS heat resistance steel as an excellent candidate material for high-temperature applications.
机译：在这项研究中，通过机械合金化（MA）和热等静压（HIP）工艺制造了添加了Y2O3的奥氏体氧化物弥散强化（ODS）耐热钢。加工后的钢表现出具有双峰粒度分布的超细晶粒（UFG）显微组织。沉积在晶粒内部的许多纳米颗粒的平均尺寸为8.77 nm。大多数颗粒显示出聚集结构，富Y相包裹在富Cu相周围。富Y相被确定为与奥氏体基体半相干的Y2O3。富Cu相的存在有利于Y 2 O 3的沉淀。在室温和650摄氏度下进行的机械性能测试表明，由于存在超细晶粒和许多氧化物纳米颗粒，因此与商用Super304H奥氏体耐热钢相比，强度有了很大的提高。较高的拉伸强度使这种奥氏体ODS耐热钢成为高温应用的极佳候选材料。

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