| 氧化物弥散强化钢的强化机理 |
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| 引用本文： | 郭丽娜, 胡本芙, 刘安强, 贾成厂, 李慧英. 氧化物弥散强化钢的强化机理[J]. 工程科学学报, 2013, 35(5): 586-591. DOI: 10.13374/j.issn1001-053x.2013.05.006 |
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| 作者姓名： | 郭丽娜 胡本芙 刘安强 贾成厂 李慧英 |
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| 作者单位： | 1. 中国原子能科学研究院反应堆工程研究设计所, 北京 102313; |
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| 基金项目： | 国家重点基础研究发展计划资助项目(2007CB209800) |
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| 摘 要： | 采用粉末冶金法制备出成分为Fe-12.5Cr-2.5W-0.4Ti-0.02V-0.4Y2O3(12Cr-ODS,质量分数,%)的铁素体钢.通过电镜观察及力学性能测试等手段研究了12Cr-ODS铁素体钢的组织与性能,并定量计算了不同强化机制对合金屈服强度的贡献.电镜观察发现12Cr-ODS钢为等轴的铁素体组织,平均晶粒尺寸为1.5μm,不同尺寸氧化物在基体中均匀分布.力学性能测试结果表明12Cr-ODS钢具有优异的室温拉伸性能,屈服强度达到738 MPa.合金主要强化机制为氧化物弥散强化、氧化物弥散强化钢加工强化、热错配位错强化和晶界强化机制,各种强化机制计算得到的理论屈服强度为750 MPa,与实测值吻合较好.
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| 关 键 词： | 铁素体钢 氧化物 强化 组织 拉伸性能 粉末冶金 |
| 收稿时间： | 2012-01-23 |
Strengthening mechanisms of oxide dispersion strengthened steel |
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| GUO Li-na, HU Ben-fu, LIU An-qiang, JIA Cheng-chang, LI Hui-ying. Strengthening mechanisms of oxide dispersion strengthened steel[J]. Chinese Journal of Engineering, 2013, 35(5): 586-591. DOI: 10.13374/j.issn1001-053x.2013.05.006 |
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| Authors: | GUO Li-na HU Ben-fu LIU An-qiang JIA Cheng-chang LI Hui-ying |
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| Affiliation: | 1. Department of Reactor Engineering Research and Design,China Institute of Atomic Energy,Beijing 102413,China;2. School of Material Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China |
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| Abstract: | An oxide dispersion strengthened (ODS) ferritic steel with the nominal composition of Fe-12.5Cr-2.5W-0.4Ti-0.02V-0.4Y203 (designated 12Cr-ODS,% by mass) was produced by powder metallurgy. Its microstructure and mechanical properties were investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and mechanical properties testing. Quantitative calculations were performed to find out the contribution of different strengthening mechanisms to the yield strength of the steel. SEM and TEM observations show that the steel exhibits equiaxed ferritic grains, its average size is 1.5 μm, and oxide particles of different sizes appear quite homogeneously distributed in the matrix. Tensile testing results indicate that the steel has superior tensile strength with the high yield strength of 738 MPa at room temperature. Orowan strengthening, work hardening effect of reinforced particles, dislocation strengthening by thermal expansion mismatch, and grain boundary strengthening are the main strengthening mechanisms of the steel. The theoretical yield strength is 750 MPa, which is in good agreement with the experimental data. |
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| Keywords: | ferritic steel oxides strengthening microstructure tensile properties powder metallurgy |
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