| 铅铋合金提纯用316L坩埚失效行为分析 |
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| 引用本文： | 张雪宁,周建明,丁祥彬,张伟伟,雷玉成. 铅铋合金提纯用316L坩埚失效行为分析[J]. 失效分析与预防, 2020, 15(4): 237-242. DOI: 10.3969/j.issn.1673-6214.2020.04.007 |
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| 作者姓名： | 张雪宁 周建明 丁祥彬 张伟伟 雷玉成 |
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| 作者单位： | 1.江苏大学 材料科学与工程学院，江苏 镇江 212013 |
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| 摘 要： | 使用316L坩埚对铅铋合金进行提纯处理6~7个月后，坩埚底部出现穿孔现象，侧壁减薄明显。利用XRD、SEM-EDS、LCM和体视显微镜对失效316L坩埚表面形貌、截面组分进行观察分析，结合使役环境分析失效原因。结果表明:在600 ℃待提纯液态铅铋合金中，316L坩埚发生严重的溶解腐蚀和氧化腐蚀；表面形成能有效保护基体的不均匀氧化层；未被氧化层保护的区域Sb元素富集，基体材料以大块物质剥落的形式进行溶解；基体内部出现蚀孔，蚀孔达到临界尺寸或在外力作用下，边缘处裂纹形核并长大，Sb元素沿裂纹扩展通道向基体内部渗透富集并溶解基体。
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| 关 键 词： | 316L 液态铅铋合金 氧化腐蚀 溶解腐蚀 穿孔失效 |
| 收稿时间： | 2020-05-11 |
Failure Behavior Analysis of 316L Crucible for Lead Bismuth Alloy Purification |
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| ZHANG Xue-ning,ZHOU Jian-ming,DING Xiang-bin,ZHANG Wei-wei,LEI Yu-cheng. Failure Behavior Analysis of 316L Crucible for Lead Bismuth Alloy Purification[J]. Failure Analysis and Prevention, 2020, 15(4): 237-242. DOI: 10.3969/j.issn.1673-6214.2020.04.007 |
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| Authors: | ZHANG Xue-ning ZHOU Jian-ming DING Xiang-bin ZHANG Wei-wei LEI Yu-cheng |
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| Abstract: | After using 316L crucible for lead bismuth alloy purification for 6-7 months, the bottom of the crucible was perforated and the side wall was thinned obviously. X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive spectrometry (EDS), laser confocal microscope (LCM) and stereomicroscope were carried out to observe and analyze the surface morphology and cross-section components of 316L failure crucible, and the causes of perforation failure were analyzed combined with the service condition. The results showed that in the liquid lead bismuth alloy to been purified at 600 ℃, the 316L crucible had seriously dissolution corrosion and oxidation corrosion and the formation of uneven oxide layer could effectively prevent the matrix material. The areas not protected by oxide layer were enrichment of Sb element, and the matrix material was dissolved in the form of large pieces of material peeling off. The matrix had gradually grown corrosion holes. When corrosion holes grew to critical size or under the action of external force, the cracks at the edge nucleate and grew up and Sb element infiltrated into the matrix and dissolved the matrix along the crack propagation channel. |
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