长时热暴露对一种抗热腐蚀单晶高温合金/Pt-Al涂层体系微观组织演化的影响  

Effect of Long-term Thermal Exposure on Microstructure Evolution of a Platinum Modified Aluminide Coated Single Crystal Superalloy DD413

作　　者：张英健 张思倩[1] 王栋[2] 张浩宇 周舸 陈立佳[1] ZHANG Yingjian;ZHANG Siqian;WANG Dong;ZHANG Haoyu;ZHOU Ge;CHEN Lijia(School of Material Science and Engineering,Shenyang University of Technology,Shenyang 110870,China;Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,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,沈阳110016

出　　处：《材料研究学报》2023年第12期889-899,共11页Chinese Journal of Materials Research

基　　金：国家自然科学基金(52071219)。

摘　　要：用电镀Pt和气相渗铝方法在抗热腐蚀镍基单晶高温合金DD413表面制备Pt-Al涂层并将其分别在850℃和1000℃长时热暴露,用扫描电子显微镜(SEM)、能谱分析仪(EDS)、透射电子显微镜(TEM)和X射线衍射仪(XRD)等手段表征其基体/涂层间的互扩散行为和近涂层基体界面的微观组织,研究了长时热暴露对其微观组织演化的影响。结果表明:随着热暴露时间的延长互扩散区(IDZ)内的MC碳化物和σ-TCP相都发生不同程度的溶解,并在界面上析出M_(23)C_(6)碳化物。同时,二次反应区(SRZ)的尺寸及其内的σ-TCP相的含量不断提高。近涂层基体中的立方状γ’相依次发生球化和相互联接呈筏形转变。热暴露温度越高上述组织退化过程越明显,长时热暴露引起的组织退化与高温下元素的扩散密切相关。A nickel base single crystal superalloy DD413 was coated with platinum modified aluminide(Pt-Al)coating via successively Pt electrodepositing and vapor phase aluminizing,then the degradation behavior of the Pt-Al coating/DD413 alloy after long-term thermal exposure in air at 850℃and 1000℃is studied by means of scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS),transmission electron microscopy(TEM)and X-ray diffraction(XRD).The results show that with the extension of thermal exposure time,MC carbide andσ-TCP phase dissolve to varying degrees in the interdiffusion of zone(IDZ),accompanied by M_(23)C_(6)carbide precipitation on the interface.At the same time,the size of the secondary reaction of zone(SRZ)andσ-TCP phase increases continuously.In the substrate beneath the coating,cubicγ'precipitates are spheroidized and connected with each other in a raft shape.The higher thermal exposure temperature,the more obvious the above microstructure degradation process.It can be seen from the comparative analysis that the microstructure degradation after long-term thermal exposure is closely related to the diffusion of elements at high temperatures.

关 键 词：金属材料 镍基单晶高温合金 Pt-Al涂层 长时热暴露 界面显微组织退化 

分 类 号：TG113[金属学及工艺—物理冶金]