基于EFTEM表征的Al含量对18Cr-ODS钢的相分离行为影响研究
EFTEM Study on the Effect of Al Content on the Phase Separation Behavior in 18 Cr-ODS Steels
DOI: 10.12677/MS.2018.89107, PDF,  被引量    科研立项经费支持
作者: 窦 鹏, 张允题, 方 宇, 叶 侨：重庆大学材料科学与工程学院，重庆；木村晃彦：京都大学先进能源研究所，京都，日本；鵜飼重治：北海道大学工程学部，材料科学与工程系，札幌，日本
关键词: ODS钢；热时效；相分离；核–壳结构；能量过滤透射电子显微学(EFTEM)；ODS Steels； Thermal Ageing； Phase Separation； Core-Shell Structure； Energy-Filtered Transmission Electron Microscopy (EFTEM)
摘要: Al添加高铬ODS钢有优异的蠕变强度、抗氧化性能、抗腐蚀性能、耐辐照性能及核燃料相容性，是先进核能系统和轻水堆的抗事故燃料的最有希望的候选包壳材料之一。在高温环境长期服役时，Al添加高铬ODS钢有可能由于发生Fe-Cr相分离而遭受热时效硬化和/或热时效脆化。本研究通过能量过滤透射电子显微学(Energy-filtered transmission electron microscopy, EFTEM)技术研究了Al含量(5~9 wt.%)对18Cr-ODS钢在经过475℃和9000 h热时效后的Fe-Cr相分离行为的影响。18Cr-5Al (wt.%)和18Cr-7Al (wt.%) ODS钢中发生了显著的Fe-Cr相分离，形成了大量的富铬相(α’相)，并发现大量有核–壳结构粒子。18Cr-9Al (wt.%) ODS钢中未发现α′相与核–壳结构，这表明当Al的添加量为9 wt.%时，可完全抑制18Cr-ODS钢中的Fe-Cr相分离。根据所得结果简要讨论了核–壳结构形成机制。
Abstract: Al-added high-Cr ODS steel is one of the most promising candidate cladding materials for advanced nuclear energy systems and accident tolerant fuel of light water reactors because it has excellent resistance to creep, oxidation, corrosion and irradiation and, moreover, very good compatibility with nuclear fuels. However, it may suffer from thermal aging hardening and/or embrittlement during long-term service in the high temperature environment due to Fe-Cr phase separation. The effect of Al content (5 - 9 wt.%) on the Fe-Cr phase separation behavior of 18Cr-ODS steels, which have undergone thermal aging at 475˚C for 9000 h, has been investigated by energy-filtered transmission electron microscopy (EFTEM). In isothermally aged 18Cr-5Al and 18Cr-7Al ODS steels, a large amount of Cr-enriched phases (α’ phases) were found, indicating significant Fe-Cr phase separation occurred. However, no α′ phase was detected in isothermally aged 18Cr-9Al ODS steel, which means the Fe-Cr phase separation behavior of 18Cr-ODS steel could be completely suppressed when the concentration of Al reaches 9 wt.%. Core-shell structured nanoparticles were detected only when Fe-Cr phase separation occurred. The underlying mechanism of the formation of core-shell structure was briefly discussed based on the results obtained here.
文章引用：窦鹏, 张允题, 方宇, 叶侨, 木村晃彦, 鵜飼重治. 基于EFTEM表征的Al含量对18Cr-ODS钢的相分离行为影响研究[J]. 材料科学, 2018, 8(9): 917-927. https://doi.org/10.12677/MS.2018.89107

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