STEM and HRTEM study on matrix microstructure and oxide particles in 11Cr ferritic/martensitic ODS steel
STEM and HRTEM study on matrix microstructure and oxide particles in 11Cr ferritic/martensitic ODS steel
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11Cr铁素体/马氏体ODS钢基体显微组织和氧化物颗粒的STEM和HRTEM研究
DOI：
10.1016/j.jnucmat.2023.154259
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发表时间：
2023-01
影响因子：
3.1
通讯作者：
Yong-Chun Yang
中科院分区：
文献类型：
--
作者：
Tian-Xing Yang;Peng Dou;Peng Zhang;Yong-Chun Yang
Fe-Cr氧化物弥散强化（ODS）钢具有上级的高温强度、抗腐蚀、抗蠕变和抗辐照性能，是钠冷快堆和聚变堆包层高燃耗燃料包壳的候选结构材料之一。用扫描透射电镜（STEM）和高分辨透射电镜（HRTEM）研究了11 Cr铁素体/马氏体ODS钢（Fe-11 Cr-0.13C-1.3W-0.4Ni-0.3Ti-0.35Y2O3）的基体组织和氧化物。11 Cr F/M ODS钢的基体组织为回火马氏体和残余铁素体。残余铁素体的氧化物的分散形态好得多，相对于回火马氏体，因为在前者中的氧化物具有小得多的平均直径和颗粒间间距，但是，显着较高的数密度和体积分数。对于回火马氏体和残余铁素体，41和69纳米粒子的峰值分数，因此，最显着的贡献，宏观性能的相识别，分别完成。回火马氏体中Y-Ti-O、Y-Cr-O、TiO 2和Y2 O3的含量分别为58.5%、12.2%、19.5%和9.8%。残余铁素体中Y-Ti-O、Y-Cr-O、TiO 2和Y2 O3的含量分别为65.3%、8.7%、15.9%和10.1%。回火马氏体和残余铁素体的相和相应的纳米粒子数分数没有显著差异。氧化物晶格和残余铁素体基体之间的相干性和晶体学取向关系是普遍存在的，而且，氧化物晶格和回火马氏体基体之间的这种相干性和晶体学相关性只是偶尔检测到。讨论了11 Cr F/M ODS钢中各种氧化物的形成和多晶型转变机制，残余铁素体纳米颗粒弥散形态优于回火马氏体的结构根源，以及11 Cr F/M ODS钢的强化机制。
Fe–Cr oxide dispersion strengthened (ODS) steel is one of the candidate structural materials for high burn-up fuel cladding of sodium-cooled fast reactor and fusion reactor blanket due to its superior high temperature strength and excellent resistances to corrosion, creep and irradiation. The matrix structure and oxides in 11Cr ferritic/martensitic (F/M) ODS steel (Fe–11Cr–0.13C–1.3W–0.4Ni–0.3Ti–0.35Y2O3) have been characterized by scanning transmission electron microscopy (STEM) and high resolution transmission electron microscopy (HRTEM). The matrix of 11Cr F/M ODS steel is composed of tempered martensite (major) and residual ferrite (minor). The dispersion morphology of oxides of residual ferrite is much better, relative to that of tempered martensite, because the oxides in the former have much smaller mean diameter and inter-particle spacing and, however, significantly higher number density and volume fraction. For tempered martensite and residual ferrite, phase identifications on 41 and 69 nanoparticles with peak number fraction and, consequently, most significant contributions to the macroscopic properties, were accomplished, respectively. The proportions of Y–Ti–O, Y–Cr–O, TiO2and Y2O3in tempered martensite are 58.5%, 12.2%, 19.5% and 9.8%, respectively. The proportions of Y–Ti–O, Y–Cr–O, TiO2and Y2O3in residual ferrite are 65.3%, 8.7%, 15.9% and 10.1%, respectively. There is no considerable difference in phases and their corresponding number fractions of nanoparticles between tempered martensite and residual ferrite. Coherency and crystallographic orientation relationship between the lattice of oxides and that of the residual ferrite matrix are ubiquitous and, moreover, such coherency and crystallographic correlation between the lattice of oxides and that of the tempered martensite matrix were only occasionally detected. The mechanisms of the formation and polymorphic transition of various kinds of oxides, the structure origins of the much better dispersion morphology of the nanoparticles of residual ferrite, relative to that of tempered martensite, and, moreover, the strengthening mechanisms in the 11Cr F/M ODS steel were discussed.
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