长时热暴露对一种热障涂层/DZ411镍基高温合金体系界面组织演变的影响  

Effect of Long-term Thermal Exposure on Microstructure Evolution of Interface Thermal Barrier Coating/DZ411 Ni-based Superalloy

作　　者：袁鸿渊 张思倩[1] 王栋[2] 张英建 马力 于明涵 张浩宇 周舸 陈立佳[1] YUAN Hongyuan;ZHANG Siqian;WANG Dong;ZHANG Yingjian;MA Li;YU Minghan;ZHANG Haoyu;ZHOU Ge;CHEN Lijia(School of Material Science and Engineering,Shenyang University of Technology,Shenyang 110870,China;Superalloys Division,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;School of Materials Science and Engineering,Northeastern University,Shenyang,110819,China)

机构地区：[1]沈阳工业大学材料科学与工程学院,沈阳110870 [2]中国科学院金属研究所高温结构材料研究部,沈阳110016 [3]东北大学材料科学与工程学院,沈阳110819

出　　处：《材料研究学报》2025年第2期113-125,共13页Chinese Journal of Materials Research

基　　金：国家科技重大项目(J2019-Ⅳ-0006-0074,J2019-Ⅵ-0010-0124);国家自然科学基金(52071219);燃气轮机项目科学中心资助(P2021-AB-Ⅳ-001-002)。

摘　　要：将一种热障涂层/DZ411镍基高温合金体系分别在900和1000℃进行长时热暴露,使用扫描电子显微镜(SEM)、能谱分析仪(EDS)、透射电子显微镜(TEM)等手段表征涂层/基体界面以研究其微观组织的演变行为。结果表明:随着热暴露时间的延长基体/涂层界面(CSI)下方的基体发生再结晶,σ相的析出方向与CSI呈45°角。在900和1000℃热暴露的二次反应区(SRZ)与拓扑密堆相(TCP)的演变显著不同。在900℃热暴露100 h后富Cr相弥散分布在混乱的γ'相组成的互扩散区(IDZ),而在1000℃热暴露100 h后IDZ、SRZ由胞状再结晶组成,富Cr相的析出不明显。在900℃热暴露500~2000 h后IDZ、SRZ逐渐长大,富Cr相在再结晶晶界附近沿着与CSI呈45°角的方向析出;在1000℃热暴露后富Cr相在再结晶晶界下方聚集析出,SRZ逐渐退化为IDZ。长时热暴露后,界面组织的演变与元素的扩散密切相关。Herein,the effect of long term thermal exposure at 900 and 1000℃ on the microstructure variation of the interface MCrAlY thermal barrier coating/DZ411 Ni-based directionally solidified superalloy(IC/S)was studied by means of scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS)and transmission electron microscopy(TEM).The results indicate that with the extension of thermal exposure time,the substrate beneath the IC/S undergoes recrystallization,the orientation ofσ-phase precipitates is 45°respect to the IC/S.Significant differences were observed in the evolution of secondary reaction zone(SRZ)and topologically close-packed(TCP)phases during heating process at 900℃ and 1000℃.After being exposed at 900℃for 100 h the granular Cr-rich phase precipitated in the interdiffusion zone(IDZ)composed of chaotically distributed γ'-phase;In contrast,IDZ and SRZ were formed after being exposed at 1000℃ for 100 h,and the precipitates of Cr-rich phase were not significant.After being exposed at 900℃ for 500 h to 2000 h,IDZ and SRZ gradually grow,and the orientation of Cr-rich phase precipitates nearby the recrystallized grain boundary with an angle 45°;However,at 1000℃ the Cr-rich phase precipitates and aggregates below the recrystallized grain boundary,and SRZ gradually degenerates into IDZ.The evolution of interface structure is closely related to the diffusion of elements after long-term heat exposure.

关 键 词：金属材料 镍基高温合金 长时热暴露 界面组织 涂层/基体界面 

分 类 号：TG132.32[一般工业技术—材料科学与工程]