Cr涂层对Zr-1Nb合金包壳微动磨损行为的影响

Effects of Cr Coating on Fretting Wear Behavior of Zr-1Nb Alloy Cladding

采用三维白光干涉仪、扫描电子显微镜、能谱仪等表征技术对比研究Cr涂层Zr-1Nb合金包壳和Zr-1Nb合金包壳与格架在模拟压水堆一回路水环境下的微动磨损行为及损伤机制。结果表明,Cr涂层显著提高Zr-1Nb合金包壳的抗微动磨损性能。此外,对磨副为刚凸时,Zr-1Nb合金包壳微动磨损机制以磨粒磨损和剥层磨损为主,而Cr涂层Zr-1Nb合金包壳由于表面硬度较高,且表面形成具有保护作用的三体层,其损伤机制以黏着磨损和材料单向转移为主。对磨副为弹簧时,Zr-1Nb合金包壳微动磨损机制主要为剥层和黏着磨损,Cr涂层Zr-1Nb合金包壳主要为磨粒磨损。

The fretting wear behavior and damage mechanism of Cr-coated and uncoated Zr-1Nb alloy cladding with AFA 3G grid under simulated PWR primary water environment were studied contrastively by 3D white light interferometer,SEM and EDS.The results indicate that Cr coating can significantly improve the fretting wear resistance of Zr-1Nb alloy cladding.In addition,for cladding against dimple,the dominant wear mechanism of Zr-1Nb is delamination and abrasive wear.However,the main damage mechanism of Cr-coated Zr-1Nb is adhesive wear and materials transfer,due to higher surface hardness and formation of protective third body layer.For claddi ng against spring,the damage mechanism is delamination and adhesive wear for Zr-1Nb,while abrasive wear for Cr-coated Zr-1Nb.