摘要
铅冷快堆作为第Ⅳ代核反应堆的推荐堆型,具有显著的先进性。然而,耐铅铋腐蚀结构材料一直是制约其发展的重要因素。已有研究表明Fe_(37)Ni_(36)Cr_(10)Al_(17)多主元合金具有良好的静态铅铋相容性。基于此,以Fe_(37)Ni_(36)Cr_(10)Al_(17)合金为对象,在含氧量为10^(-7)%(质量分数)、流速为2 m/s的550℃液态铅铋中暴露2 000 h以探究其动态腐蚀行为,为新型含Al金属材料在铅冷快堆中的应用提供研究基础。结果表明,Al对氧化层的致密性和稳定性起决定性作用。当合金表面生成富Al氧化层时,合金能够得到很好保护;当氧化层中Al含量较低或分布不均时,合金会发生明显的溶解腐蚀。溶解腐蚀主要发生在FCC相中,导致FCC相中的Ni大量流失,并析出弥散的B2相。相比于传统商用不锈钢,Fe_(37)Ni_(36)Cr_(10)Al_(17)合金的溶解腐蚀深度较浅,具有明显的应用优势。
As the recommended reactor type for fourth-generation nuclear reactors,lead-cooled fast reactors have made remarkable progress.However,lead-bismuth corrosion-resistant structural materials have always been an important factor restricting their development.Previous studies have shown that Fe37Ni36Cr10Al17 multiprinciple component alloys have good static lead-bismuth compatibility.Therefore,with the Fe37Ni36Cr10Al17 alloy as the object,the dynamic corrosion behavior of a 550℃liquid lead-bismuth eutectic with an oxygen content of 10-7 wt.%and a flow rate of 2 m/s was explored,providing a research basis for the application of new Al-containing metallic materials in lead-cooled fast reactors.These results indicate that Al plays a decisive role in the oxide layer.When the alloy indicates the formation of an Al-rich oxide layer,the alloy can be well protected;when the Al content in the oxide layer is low or unevenly distributed,the Fe37Ni36Cr10Al17 alloy undergoes significant dissolution corrosion.Dissolution corrosion mainly occurs in the FCC phase,causing a significant loss of Ni,a decrease in stability,and the precipitation of the dispersed B2 phase.Compared with traditional commercial stainless steel,the Fe37Ni36Cr10Al17 alloy has a shallower dissolution corrosion depth and significant application advantages.
作者
王健斌
赵可
王志军
刘小明
黄赟浩
李俊杰
王锦程
WANG Jianbin;ZHAO Ke;WANG Zhijun;LIU Xiaoming;HUANG Yunhao;LI Junjie;WANG Jincheng(State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi'an 710072,China;Science and Technology on Reactor Fuel and Materials Laboratory,Nuclear Power Institute ofChina,Chengdu 610213,China)
出处
《铸造技术》
2025年第5期464-470,共7页
Foundry Technology
基金
国家自然科学基金(52001299)
中核集团基础科研项目(NPIC-z3012023004)
中核集团青年英才(NPIC-k301007038)。
关键词
铅冷快堆
铅铋合金
动态腐蚀
FeNiCrAl多主元合金
lead-cooled fast reactor
lead-bismuth eutectic alloy
dynamic corrosion
FeNiCrAl multiprinciple component alloy
