Hf对ODS-FeCrAl合金微观组织及性能的影响
Effect of Hf on Microstructure and Property of ODS-FeCrAl Alloy
查看参考文献22篇
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文摘
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为研究少量添加的Hf对ODS-FeCrAl合金微观组织及性能的影响,通过机械合金化和后续的热等静压工艺研制两种14Cr-ODS-FeCrAl合金,对其进行微观结构、力学性能、1 200 ℃空气抗氧化性能和1 200 ℃水蒸气抗腐蚀性能测试。TEM结果表明,两种合金中YAlO_3氧化物析出相细小弥散,而Hf的添加促进合金基体中生成颗粒尺寸更加细小的Y_2Hf_2O_7纳米氧化物。由于纳米氧化物Orowan的强化机制,两种合金均具有优异的室温与高温力学性能。XRD和SEM结果表明,两种合金经过1 200 ℃空气氧化与1 200 ℃水蒸气腐蚀后,表面均形成均匀致密的α-Al_2O_3膜,对合金起保护作用。Hf添加有利于合金在1 200 ℃水蒸气腐蚀条件下形成更加均匀的α-Al_2O_3膜,抑制Al~(3+)的向外扩散,避免合金内部晶界处形成空穴。 |
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其他语种文摘
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In order to study the effect of a small amount of Hf on the microstructure and property of ODS-FeCrAl alloy,two kinds of 14Cr-ODS-FeCrAl alloys were prepared by mechanical alloying and subsequent hot isostatic pressing.The microstructure,mechanical property,air oxidation resistance at 1 200 ℃ and steam corrosion resistance at 1 200 ℃ were tested.TEM results show that the oxide precipitate phases of YAlO_3 oxide in the two kinds of alloys are fine and dispersed,while the addition of Hf promotes the formation of Y_2Hf_2O_7 nano-oxide with finer particle size in the alloy matrix.Due to the Orowan strengthening mechanism,the two kinds of alloys have excellent mechanical property at room temperature and high temperature.The results of XRD and SEM show that the surface of the two kinds of alloys form uniform and dense α-Al_2O_3 film after air oxidation at 1 200 ℃ and steam corrosion at 1 200 ℃,which protects the alloy.The addition of Hf is beneficial to form more uniform α-Al_2O_3 films under the condition of 1 200 ℃ steam corrosion,to inhibit the outward diffusion of Al~(3+),and to avoid the formation of cavities at the internal grain boundary of the alloy. |
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来源
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原子能科学技术
,2020,54(4):648-656 【核心库】
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DOI
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10.7538/yzk.2019.youxian.0632
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关键词
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ODS合金
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显微组织
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氧化物析出相
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力学性能
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高温空气氧化
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高温水蒸气腐蚀
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地址
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中国科学院金属研究所, 中国科学院核用材料与安全评价重点实验室, 辽宁, 沈阳, 110016
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中国科学技术大学材料科学与工程学院, 辽宁, 沈阳, 110016
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-6931 |
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学科
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金属学与金属工艺 |
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基金
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沈阳科技局资助项目
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文献收藏号
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CSCD:6735383
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