蒸汽发生器690合金传热管微动磨损研究进展
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中图分类号：TG172.82 文献标志码：A文章编号：1006-0316（2026）02-0001-09
doi：10.3969/j.issn.1006-0316.2026.02.001
Research Progresson Fretting WearofAlloy 69o Heat Transfer Tubes in Steam Generators
ZHUANG Wenhua1，HE Jifan²，YANG Yaru1，REN Zhenxing1，WEI Chao² （1.School of Mechanical Engineering， Chengdu University， Chengdu 610106， China;
2.School of Mechanical Engineering，Southwest Jiaotong University， Chengdu， 61oo31， China）
Abstract ∵ As the second safety barrier of pressurized water reactor nuclear power plants， the heat transfer tube bundle serves a dualrole in thermal exchange and safetyisolation.However，the coupling effect offlow-induced vibrationand high-temperature water corrosion can easilyinduce freting-corrosion，causing the thinningof the tube wall， which threatens the safe operation of nuclear power plants.This paper focuses on the alloy 690 heat transfer tubes，systematically exploring the fretting-corrosion damage mechanism，damage evolution law and material oxidation behavior under different service conditions，and clarifying the mechanismand extent of the influence of key factors.The research shows that the worn area of the alloy 690 tube forms multiple layers of gradient nanostructures along the cross-sectional direction during the fretting wear process.From the matrix to the worn surface，the grain size gradually becomes finer， the oxygen content increases，and strain accumulates simultaneously.In light of these findings，strategies for improving wear resistanceareproposed from the perspectives of surface modification and microstructure regulation： deposit a strengthening coating on the surface;optimize the grain size，ensure a disordered distribution ofcarbides at grain boundaries，and shorten the aging treatment time to synergistically enhance the hardness and toughness of the material.By clarifying the failure mechanism of the alloy 690 tube and exploring optimization measures，this study provides guidance for the design and protection of high-reliability nuclear-grade alloys.
Key words ： fretting;oxidation; alloy 69O tube;heat transfer tube;wear mechanism
随着我国社会经济发展对能源供给和环境保护的双重需求日益紧迫，发展核电成为优化能源结构、保障能源与经济安全、改善环境及推动科技进步的关键途径。（剩余15153字）
