氧化铝奥氏体钢在 600°C 下暴露于含 10-8 重量百分比氧气的铅铋共晶时,脱捻和沉淀对溶解腐蚀的协同抑制作用

IF 11.2 1区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Materials Science & Technology Pub Date : 2024-11-01 DOI:10.1016/j.jmst.2024.10.009
Decang Zhang, Xiaoxin Zhang, Jun Zhang, Hao Ren, Zhonghui Liao, Xian Zeng, Qingzhi Yan
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引用次数: 0

摘要

这项工作研究了冷作氧化铝奥氏体钢的原始微观结构,以及其在 600°C 氧气含量为 10-8 wt.% 的铅铋共晶中的沉淀和溶解腐蚀行为,并使用固溶退火钢作为对比。异常的是,与固溶退火钢相比,冷作钢的腐蚀程度更轻,暴露 1700 小时后的平均腐蚀深度分别为 314.3 和 401.0 μm。冷加工引起的去捻将退火孪晶边界转变为正常高角度晶界(NGBs),使 NGBs 比例从 36% 增加到 89%。增加的 NGB 为由 NiAl 和 M23C6 沉淀交替组成的晶间障提供了更多的成核点,从而更好地阻止了溶解侵蚀。
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Synergistic inhibition to dissolution corrosion by de-twinning and precipitation in alumina-forming austenitic steel exposed to lead-bismuth eutectic with 10-8 wt.% oxygen at 600°C
This work investigated the original microstructure of cold-worked alumina-forming austenitic steel, along with its precipitation and dissolution corrosion behaviors in lead-bismuth eutectic with 10-8 wt.% oxygen at 600°C, using solution-annealed steel for comparison. Anomalously, cold-worked steel presented milder corrosion compared to solution-annealed steel, with average corrosion depths of 314.3 and 401.0 μm after 1700 h exposure. Cold working-induced de-twinning transformed the annealing twin boundaries into normal high-angle grain boundaries (NGBs), increasing NGBs proportion from 36% to 89%. The increased NGBs provided more nucleation sites for intergranular barriers composed of alternate NiAl and M23C6 precipitates, thus better obstructing the dissolution attack.
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来源期刊
Journal of Materials Science & Technology
Journal of Materials Science & Technology 工程技术-材料科学:综合
CiteScore
20.00
自引率
11.00%
发文量
995
审稿时长
13 days
期刊介绍: Journal of Materials Science & Technology strives to promote global collaboration in the field of materials science and technology. It primarily publishes original research papers, invited review articles, letters, research notes, and summaries of scientific achievements. The journal covers a wide range of materials science and technology topics, including metallic materials, inorganic nonmetallic materials, and composite materials.
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