Corrosion characteristics of low activation ferritic steel, JLF-1, in liquid lithium in static and thermal convection conditions
Corrosion characteristics of low activation ferritic steel, JLF-1, in liquid lithium in static and thermal convection conditions
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DOI：
10.1016/j.fusengdes.2008.05.034
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发表时间：
2008-12
影响因子：
1.7
通讯作者：
Qi Xu;M. Kondo;T. Nagasaka;T. Muroga;M. Nagura;A. Suzuki
中科院分区：
文献类型：
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作者：
Qi Xu;M. Kondo;T. Nagasaka;T. Muroga;M. Nagura;A. Suzuki
研究了 JLF-1(Fe–9Cr–2W–0.1C)（一种低活化铁素体/马氏体 (RAFM) 钢）与静态和流动锂 (Li) 的兼容性。通过失重测量和扫描电子显微镜（SEM）/能谱仪（EDS）对试样表面和横截面进行分析，研究了腐蚀特征。 JLF-1样品的失重在500℃和600℃温度下呈现饱和状态。这可能是由于块状锂中铁、铬的饱和或在样品表面附近的液态锂中溶解元素的饱和层的形成。在热对流回路腐蚀试验中，500℃、250h的腐蚀速率明显大于相同条件下静态试验的腐蚀速率。锂暴露后，样品上发现了从马氏体到铁素体的相变。化学分析结果和碳化物的损失表明相变是由碳的贫化引起的。同时，通过EDS在表面检测到Cr和W等合金元素的选择性贫化。维氏硬度测试结果表明，浸锂后试件表面发生了明显的软化，软化区域的深度与相变的深度一致。流动的锂由于传质而增强了重量损失、相变和硬度降低。
The compatibility of JLF-1(Fe–9Cr–2W–0.1C), a reduced activation ferritec/martensitic (RAFM) steel with static and flowing lithium (Li) was investigated. The corrosion characteristics were studied by means of measurement of weight losses and scanning electron microscope (SEM)/energy dispersive X-ray spectrometer (EDS) analysis on the surfaces and cross-sections of the specimens. The weight losses of JLF-1 specimens showed saturation at the temperature of 500°C and 600°C. This is possibly due to the saturation of Fe, Cr in bulk Li or formation of saturated layer of dissolved elements in liquid Li near the specimen surface. In the corrosion test in a thermal convection loop, the corrosion rate at 500°C for 250h was significantly larger than that obtained in the static test in an identical condition. After Li exposure, the phase transformation from martensite to ferrite was found on the specimens. The chemical analysis results and the loss of carbides suggested that the phase change was caused by the depletion of carbon. At the same time, selective depletion of alloy elements, such as Cr and W was detected by EDS on the surface. The result of Vickers hardness test showed that obvious softening occurred on the surface of the specimens after Li exposure and the depth of the softened region was consistent with that of the phase transformation. The flowing Li enhanced the weight loss, phase change and hardness reduction due to the mass transfer.