摘要
使用强度为0.1 N、0.2 N、0.3 N以及0.45 N的喷丸对用EB-PVD制备的CoCrAlY涂层进行表面强化,观察了喷丸强化前后涂层的表面形貌,测量了喷丸前后涂层的表面粗糙度、表面残余应力、涂层的厚度和截面硬度,对比分析了喷丸前后涂层物相变化以及涂层高温氧化性能。结果表明:当喷丸强度为0.2 N时,CoCrAlY涂层的抗高温氧化性能大幅度提高。喷丸强度大于等于0.45 N时涂层出现破损,抗高温氧化性能降低。适当强度的喷丸能降低CoCrAlY涂层表面的粗糙度,提高涂层的致密度,改善物相结构,进而提高其抗高温氧化性能。喷丸强度大于等于0.3 N时CoCrAlY涂层表面出现鳞状突出物,Al氧化物在此处择优生长,Al氧化膜因应力集中而破裂,降低涂层的使用寿命。
In order to investigate the isothermal oxidation performance of CoCrAlY coatings prepared by EB-PVD after high energy shot peening process with different intensity, the CoCrAlY coatings on high temperature alloy DZ466 were surface shot peened with intensity of 0.1 N, 0.2 N, 0.3 N and0.45 N. The shot peened coatings were characterized in terms of surface morphology, surface roughness, surface residual stress, thickness and cross-sectional hardness and phase composition, as well as isothermal oxidation behavior in air at 1050℃. Results show that the isothermal oxidation resistance of CoCrAlY coating prepared by EB-PVD is greatly improved after surface shot peening with intensity of 0.1 N. When the shot peening intensity is greater than or equal to 0.45 N, the coating is damaged, which degrades the isothermal oxidation performance of the CoCrAlY coating. The suitable shot peening intensity can decrease the surface roughness, whilst increase the density and change the phase composition of the CoCrAlY coating, and so that lead to the improvement of isothermal oxidation performance of the CoCr Al Y coating. When the shot peening intensity is greater than or equal to 0.3 N, scale-shaped bulges formed on the surface of CoCrAlY coating, resulting in preferential growth of Al-oxide there. Because of the rupture of Al-oxide film induced by stress concentration in this place, the service life of coating is degraded.
作者
何利民
邓仲华
黄光宏
常振东
刘其斌
HE Limin;DENG Zhonghua;HUANG Guanghong;CHANG Zhendong;LIU Qibin(Research Institute of Surface Engineering,Beijing Institute of Aeronautical Materials,Beijing 100095,China;College of Materials and Metallurgy,Guizhou University,Guiyang 550025,China)
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2018年第7期525-532,共8页
Chinese Journal of Materials Research
基金
国家高技术研究发展计划(2015AA034403)
贵州省科技合作计划(黔科合LH[2015]7650)~~
关键词
材料表面与界面
喷丸
EB-PVD
CoCrAlY涂层
高温氧化性能
塑性变形
surface and interface in the materials
shot peening
EB-PVD
CoCrAIY coating
isothermal oxidation performance
mechanical deformation
