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ODS FeCrAl合金的界面微观结构和腐蚀行为在450°C的氧和-比斯穆特欧特克中

Yang Luo¹, Shengqiang Ma^2,3, Ping Lv¹

¹State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an, 710049, Shaanxi Province, China.

Scientific reports

|October 31, 2024

概括

氧化物分散增强 (ODS) FeCrAl合金在-斯木 (LBE) 中呈现多层腐蚀膜. 形成保护,主要是通过氧化,防止LBE溶解和透.

科学领域:

材料科学材料科学材料科学
腐蚀工程腐蚀工程
核材料核材料核材料

背景情况:

氧化物分散增强 (ODS) FeCrAl合金对于高温应用至关重要.
了解液体金属环境中的腐蚀行为,如- (LBE) 等,对于材料完整性至关重要.
之前的研究强调,需要对高温下的合金与环境相互作用进行详细分析.

研究的目的:

为了研究20 wt%Cr ODS FeCrAl合金的界面微观结构和腐蚀行为.
分析合金对静态氧和LBE在450°C的反应,长时间暴露 (20-100小时).
阐明主要的腐蚀机制和形成的保护性质.

主要方法:

暴露20Cr ODS FeCrAl合金样本在450°C时与氧和的LBE.
系统地研究各种暴露时间 (20,40,60,80,100小时) 的腐蚀接口.
腐蚀薄膜和接口层的微结构分析.

主要成果:

在20Cr ODS FeCrAl合金的接口上观察到多层腐蚀膜.
确定的主要腐蚀机制是氧化,合金表面形成保护.
确定了密集的,旋形外层和富含Al的Fe-Cr旋中间层,有效地阻碍了LBE透和氧气扩散.
由Cr2O3组成的强化内部层和铁内部氧化区 (IOZ) 增强了层-基板粘附.

结论:

20Cr ODS FeCrAl合金在450°C的静态氧和LBE中表现出极好的耐腐蚀性.
保护性状物形成,包括螺旋和Cr2O3层,是主要的机制,防止LBE的溶解和透.
具有增强粘合力的多层结构确保了合金在这种激进环境中的长期完整性.

关键词:

腐蚀机制腐蚀机制腐蚀机制接口接口接口 - - 双珠 (LBE) 欧特克学微观结构的微观结构 ODS 是一种FeCrAl合金.

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