Interdiffusion Behavior and Microstructure Change of Al-, Ti-, or Ta-doped NiCoCrAlY Bond Coat on IN 792 Superalloy

IF 4 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Metals and Materials International Pub Date : 2025-04-15 DOI:10.1007/s12540-025-01921-y

Yeon Woo Yoo, Dongwon Kim, Yong-Jin Kang, Hansol Kwon, Youngjin Park, Young-Cheon Kim, Do Hyun Kim, Byoung-Joon Kim, Eungsun Byon

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Abstract

During power generation, the turbine inlet temperature of an industrial gas turbine is increasing continuously. As a high inlet temperature results in changes to microstructure of superalloys along with mechanical degradation, a highly reliable thermal barrier coating is typically developed by doping an additional element on barrier coating. To investigate the effect of such doping on barrier coating and interdiffusion behavior, Al-, Ti-, and Ta-doped NiCoCrAlY bond coat – IN 792 superalloy diffusion couples were fabricated and assessed in an isothermal oxidation test performed at 1000 °C. The results showed that the addition of Al content in the NiCoCrAlY bond coat did not suppress the change in the microstructure of the IN792. The addition of Ti in the bond coat retarded the diffusion of Ti in IN 792 superalloy, while the formation of the γʹ depletion layer of IN 792 superalloy was suppressed; however, the γ phase under the interface was instead depleted, and topologically close packed phase (TCP) phase was formed. Meanwhile, the addition of Ta in the bond coat forms (Ta, Ti)C at the interface. The carbides partially suppress the Ti diffusion of the IN792 superalloys, thus causing a reduction in the γʹ depletion layer. The experimental results indicate that the main factor for microstructure change is the Ti diffusion of IN 792 superalloys. The addition of Ta in the NiCoCrAlY bond coat is expected to improve the lifetime of the turbine blade by suppressing the change in the microstructure of the IN 792 superalloy without the formation of TCP phase.

Graphical Abstract

Abstract Image

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Al、Ti、ta掺杂NiCoCrAlY键合层在in792高温合金上的相互扩散行为和显微组织变化

工业燃气轮机在发电过程中，进气温度不断升高。由于入口温度过高会导致高温合金的微观结构发生变化，并伴有机械退化，因此通常通过在热障涂层上添加额外的元素来开发高可靠性的热障涂层。为了研究这种掺杂对势垒涂层和相互扩散行为的影响，制备了Al， Ti和ta掺杂NiCoCrAlY结合涂层- IN 792高温合金扩散偶，并在1000°C的等温氧化测试中进行了评估。结果表明，NiCoCrAlY结合层中添加Al含量并没有抑制IN792显微组织的变化。结合层中Ti的加入延缓了Ti在in 792高温合金中的扩散，抑制了in 792高温合金γ′枯竭层的形成；然而，界面下的γ相却被耗尽，形成了拓扑紧密堆积相（TCP）。同时，在结合层中加入Ta，在界面处形成（Ta, Ti）C。碳化物部分抑制了IN792高温合金的Ti扩散，导致γ′枯竭层减小。实验结果表明，导致in792高温合金显微组织变化的主要因素是Ti的扩散。在NiCoCrAlY结合层中添加Ta有望通过抑制in 792高温合金的微观组织变化而不形成TCP相来提高涡轮叶片的使用寿命。图形抽象

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来源期刊

Metals and Materials International 工程技术-材料科学：综合

CiteScore

7.10

自引率

8.60%

发文量

197

审稿时长

3.7 months

期刊介绍： Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.