Effects of contents of Al, Zr and Ti on oxide particles in Fe-15Cr-2W-0.35Y2O3 ODS steels
Effects of contents of Al, Zr and Ti on oxide particles in Fe-15Cr-2W-0.35Y2O3 ODS steels
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Al、Zr、Ti含量对Fe～15Cr～2W～0.35Y2O3 ODS钢中氧化物颗粒的影响
DOI：
10.1016/j.jnucmat.2020.152025
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发表时间：
2020-04-01
影响因子：
3.1
通讯作者：
Kimura, Akihiko
中科院分区：
文献类型：
--
作者：
Dou, Peng;Jiang, Shaomin;Kimura, Akihiko
FeCrAl氧化物弥散强化（ODS）钢是第四代核反应堆最有前途的候选包壳材料之一，因为它不仅具有优异的耐腐蚀性，而且由于纳米级氧化物的高密度，还具有优异的抗蠕变和抗辐照性能。铝含量的影响，Zr和Ti对Fe-15 Cr-3.7Al-2 W-0.1Ti-0.6Zr-0.35Y（2）O（3）中颗粒晶体和金属/氧化物界面结构的影响（3.7Al-0.1Ti-0.6Zr）和Fe-15 Cr-3.8Al-2 W-0.12Ti-0.5Zr-0.35Y（2）O（3）（3.8Al-0.12Ti-0.5Zr）的高分辨透射电子显微镜（HRTEM）研究。对于3.7Al-0.1Ti-0.6Zr和3.8Al-0.12Ti-0.5Zr ODS钢，分别在175和213个颗粒上完成相鉴定，这些颗粒具有峰数分数，因此代表对ODS钢的宏观性能贡献最大的氧化物。确定了各种氧化物的比例。对于3.7Al-0.1Ti-0.6Zr和3.8Al-0.12Ti-0.5Zr ODS钢，Y-Zr复合氧化物的比例分别为87.4%和54.4%，而Y-Al复合氧化物的数量分数分别为3.5%和5.2%，表明0.5- 0.6wt.% Zr显著抑制Y-Al复合氧化物的形成，但促进了Y-Zr复合氧化物的大量生成。对于3.7Al-0.1Ti-0.6Zr和3.8Al-0.12Ti-0.5Zr ODS钢，Y-Ti复合氧化物的比例分别为5.7%和36.6%，表明从0.09wt.%开始增加Ti含量可有效地提高Y-Ti复合氧化物的比例至0.12重量%随着Zr含量从0.63 wt.%至0.49重量%。确定了氧化物和基体的晶体学取向相关性。在此基础上，讨论了氧化物的形成和细化机理，以及ODS钢抗辐照能力和热稳定性异常的原因。(C)2020爱思唯尔B. V.保留所有权利。
FeCrAl oxide dispersion strengthened (ODS) steel is one of the most promising candidate cladding materials of generation IV nuclear reactors because of its excellent resistance to not only corrosion but also creep and irradiation due to the ultrahigh density nanometer-scale oxides. Effects of the contents of Al, Zr and Ti on the crystal and metal/oxide interface structures of the particles in Fe-15Cr-3.7Al-2W-0.1Ti-0.6Zr-0.35Y(2)O(3) (3.7Al-0.1Ti-0.6Zr) and Fe-15Cr-3.8Al-2W-0.12Ti-0.5Zr-0.35Y(2)O(3) (3.8Al-0.12Ti-0.5Zr) were studied by high resolution transmission electron microscopy (HRTEM). For 3.7Al-0.1Ti-0.6Zr and 3.8Al-0.12Ti-0.5Zr ODS steels, phase identification was accomplished on 175 and 213 particles, respectively, which have peak number fraction and, therefore, represent the oxides contributing most significantly to the macroscopic properties of the ODS steels. The proportions of various types of oxides were determined. For 3.7Al-0.1Ti-0.6Zr and 3.8Al-0.12Ti-0.5Zr ODS steels, the proportions of Y-Zr complex oxides are similar to 87.4% and similar to 54.4% while the number fractions of Y-Al complex oxides are similar to 3.5% and similar to 5.2%, respectively, indicating that 0.5-0.6 wt.% Zr inhibits the formation of Y-Al complex oxides remarkably while prompts the significant occurrence of Y-Zr complex oxides. For 3.7Al-0.1Ti-0.6Zr and 3.8Al-0.12Ti-0.5Zr ODS steels, the proportions of Y-Ti complex oxides are similar to 5.7% and similar to 36.6%, respectively, indicating it is effective for increasing the proportion of Y-Ti complex oxides by increasing the content of Ti from 0.09 wt.% to 0.12 wt.% with the content of Zr decreased from 0.63 wt.% to 0.49 wt.%. The crystallographic orientation correlations of the oxides and matrix were determined. The formation and refinement mechanisms of oxides and, moreover, the reasons of the unusual irradiation tolerance and thermal stability of the ODS steel were discussed based on the results. (C) 2020 Elsevier B.V. All rights reserved.