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

doi:10.11901/1005.3093.2022.600

材料研究学报

2023, Vol. 37

Issue (12): 889-899 DOI: 10.11901/1005.3093.2022.600

研究论文

本期目录 | 过刊浏览

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

张英健¹, 张思倩¹(

), 王栋², 张浩宇¹, 周舸¹, 陈立佳¹

^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

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

ZHANG Yingjian¹, ZHANG Siqian¹(

), WANG Dong², ZHANG Haoyu¹, ZHOU Ge¹, CHEN Lijia¹

^1.School of Material Science and Engineering, Shenyang University of Technology, Shenyang 110870, China
^2.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

引用本文:

张英健, 张思倩, 王栋, 张浩宇, 周舸, 陈立佳. 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[J]. 材料研究学报, 2023, 37(12): 889-899.
Yingjian ZHANG, Siqian ZHANG, Dong WANG, Haoyu ZHANG, Ge ZHOU, Lijia CHEN. Effect of Long-term Thermal Exposure on Microstructure Evolution of a Platinum Modified Aluminide Coated Single Crystal Superalloy DD413[J]. Chinese Journal of Materials Research, 2023, 37(12): 889-899.

全文: PDF(18854 KB) HTML

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M₂₃C₆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。

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

Abstract：

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 and σ-TCP phase dissolve to varying degrees in the interdiffusion of zone (IDZ), accompanied by M₂₃C₆ carbide precipitation on the interface. At the same time, the size of the secondary reaction of zone (SRZ) and σ-TCP phase increases continuously. In the substrate beneath the coating, cubic γ' 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.

Key words： metallic materials Nickel base single crystal superalloy Pt-Al Coating Long-term thermal exposure Interface microstructure degradation

收稿日期: 2022-11-14

ZTFLH:

TG113

基金资助:国家自然科学基金(52071219)

通讯作者: 张思倩，教授，sqzhang@alum.imr.ac.cn，研究方向为单晶高温合金变形损伤机制

Corresponding author: ZHANG Siqian, Tel: 13700022372, E-mail: sqzhang@alum.imr.ac.cn

作者简介: 张英健，男，1998年生，硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2022.600 或 https://www.cjmr.org/CN/Y2023/V37/I12/889

表1 DD413合金名义成分(%，质量分数)

图1 涂层/基体截面的示意图

图2 原始态Pt-Al涂层的XRD谱

图3 原始态Pt-Al涂层/合金截面的形貌和形貌中红色方框对应EDS能谱

图4 Pt-Al涂层/合金截面蚀刻后的BSE图像和EDS能谱

图5 Pt-Al涂层/合金的TEM图像及选区衍射花样(SAD)

图6 在850℃热暴露不同时间后Pt-Al涂层/合金截面的BSE图像

图7 850℃热暴露3600 h后IDZ中的块状析出相的TEM图像及选区衍射花样(SAD)

图8 在850℃热暴露不同时间后蚀刻的Pt-Al涂层/合金截面的BSE图像

图9 在850℃热暴露3600 h后的TEM图像、选区衍射花样(SAD)和针状相对应的EDS能谱

图10 在1000℃长时热暴露不同时间后Pt-Al涂层/合金截面的BSE图像:

图11 在850℃和1000℃热暴露后IDZ、SRZ厚度的演化趋势

图12 在850℃和1000℃热暴露后IDZ中MC碳化物的演化趋势

图13 长期热暴露后Pt-Al/DD413体系的XRD谱

图14 Pt-Al涂层/合金截面蚀刻后在1000℃长时热暴露不同时间后的BSE图像

图15 在1000℃/3600 h后的TEM形貌、选区衍射花样(SAD)和与针状相对应的EDS能谱

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