316和T91钢在液态铅铋合金中的腐蚀行为研究  

Corrosion Behavior of 316 and T91 Steel in Liquid Lead-bismuth Eutectic Alloy

作　　者：马韦刚[1] 邓平 曹宇 银朝晖 高军 Ma Weigang;Deng Ping;Cao Yu;Yin Zhaohui;Gao Jun(Nuclear Power Institute of China,Reactor Engineering Research Subinstisute,Chengdu,China)

机构地区：[1]中国核动力研究设计院,四川成都

出　　处：《科学技术创新》2023年第9期49-53,共5页Scientific and Technological Innovation

摘　　要：为准确评估铅冷快堆候选材料与液态铅铋合金的相容性,以预测材料的服役寿命,采用强迫对流回路,开展316和T91钢在450℃、2 m/s液态铅铋中的动态腐蚀行为研究。试验后,通过精细化表征氧化膜,并利用第一性原理构建腐蚀界面原子交互作用模型,以探明316和T91钢在液态铅铋合金中的腐蚀机理。结果表明,316和T91表面均生成连续致密的保护性氧化膜,且316发生均匀腐蚀的速率较T91低。T91钢在均匀腐蚀层下方的晶界/相界处有明显局部加速腐蚀。分析认为,316材料Cr含量差异以及加工变形产生的表面纳米晶变形层使316形成氧化膜的保护性优于T91,并导致两种材料发生不同的腐蚀行为。In order to predict the service life of key candidate materials,the corrosion behavior of such key candidate structural materials as 316 austenitic stainless steel and T91 ferrite-martensite with liquid lead-bismuth alloy was investigated.The corrosion test was conducted by using a a refreshed liquid lead-bismuth alloy loop at 450℃and 2 m/s.The investigation was conducted by comparing the microstructure of the oxide scale formed on the 316 and T91 steel in the flowing liquid lead-bismuth eutectic alloy.First principles and molecular dynamics were comnined to construct an atomic interaction model at the corrosion interface.The results revealed that a continuous and compact protective oxide film was formed on both surfaces of 316 and T91 steel in the flowing lead-bismuth alloy.The steel of 316 showed a lower overall corrsoion rate than the T91 steel.Further,enhanced localized corrosion at the grain boundary in T91 was found.The difference in corrosion behavior of the two steels is attributed to the nano-crystalline layer induced by cold working as well as the Cr content of 316 steel,both of which lead to a more protective oxide film.

关 键 词：316不锈钢 T91钢 腐蚀 纳米晶 化学成分 

分 类 号：TG172[金属学及工艺—金属表面处理] TL343[金属学及工艺—金属学]