Effects of fabrication processing on the microstructure and mechanical properties of oxide dispersion strengthening steels
Effects of fabrication processing on the microstructure and mechanical properties of oxide dispersion strengthening steels
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DOI：
10.1016/j.msea.2015.12.032
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发表时间：
2016-01
期刊：
影响因子：
6.4
通讯作者：
Yanfen Li;Jingjie Shen;Feng Li;Huilong Yang;S. Kano;Y. Matsukawa;Y. Satoh;H. Fu;H. Abe;T. Muroga
中科院分区：
文献类型：
--
作者：
Yanfen Li;Jingjie Shen;Feng Li;Huilong Yang;S. Kano;Y. Matsukawa;Y. Satoh;H. Fu;H. Abe;T. Muroga
采用不同的制备工艺制备了两种化学成分相似的氧化物弥散强化（ODS）钢（12 Cr-ODS-NIFS和12 Cr-ODS-IMR）。系统比较了不同制备工艺对ODS钢组织和力学性能的影响。与12 Cr-ODS-NIFS相比，12 Cr-ODS-IMR钢具有显著提高的机械性能，例如更高的维氏硬度、抗拉强度和蠕变强度。为了了解ODS钢优异的机械性能的微观结构的原因，系统的微观结构表征进行了通过X射线衍射，电子背散射衍射和透射电子显微镜的结合研究。研究发现，这两种钢具有相似的晶粒结构，包括小于~1 μm的细晶粒和严重变形晶粒以及大于~10 μm的细长粗晶粒，两者都具有相似的沉淀物，包括粗TiCxO 1-x颗粒和均匀分布的Y2 TiO 5纳米颗粒，直径为几个纳米。与12 Cr-ODS-NIFS相比，12 Cr-ODS-IMR具有更细的晶粒尺寸、更大的晶粒长宽比和更高的位错密度，这可能是由于额外的冷轧导致的，是其力学性能更好的原因。
Two types of oxide dispersion strengthening (ODS) steels (i.e. 12Cr-ODS-NIFS and 12Cr-ODS-IMR) with similar chemical compositions were produced through different fabrication processing. A systematic comparison was performed to investigate the effects of different fabrication processing on microstructure and mechanical properties of ODS steels. Compared to 12Cr-ODS-NIFS, the 12Cr-ODS-IMR steel exhibited significantly enhanced mechanical properties, such as higher Vickers hardness, tensile strength and creep strength. To understand the microstructural reasons for the excellent mechanical properties of ODS steels, systematic microstructure characterizations were carried out through a combined study of X-ray diffraction, electron backscattered diffraction, and transmission electron microscopy. It was found that both steels had similar grain structures comprising fine and heavily deformed grains smaller than ~1 μm and elongated coarse grains larger than ~10 μm, both of which possessed similar precipitates including coarse TiCxO1−xparticles and homogenously distributed Y2TiO5nanoparticles with diameters of several nanometers. 12Cr-ODS-IMR had a finer grain size, larger aspect ratio of grain length to width, and higher density of dislocations, which should be derived from the additional cold rolling and responsible for its better mechanical properties compared with 12Cr-ODS-NIFS.