Effect of Ta on the Microstructure and Creep Properties of a Hot-Corrosion Resistant Ni-Based Single-Crystal Superalloy After Long-Term Exposure
Received date: 2022-07-19
Revised date: 2022-09-27
Online published: 2022-10-20
Supported by
National Natural Science Foundation of China(51631008);National Natural Science Foundation of China(52071219);National Science and Technology Major Project(J2019-IV-0006-0074);National Science and Technology Major Project(2017-VI-0019-0091);National Science and Technology Major Project(J2019-VI-0010-0124);Science Center for Gas Turbine Project(P2021-A-IV-001-002)
Innovative, massive gas turbines have emerged as critical equipment for achieving the goals of energy conservation and the development of new clean energy sources. As the inlet temperature of industrial gas turbines continues to rise, the high-temperature capabilities of hot corrosion-resistant single-crystal turbine blades should be enhanced. This work investigates the effects of Ta on the microstructural stability and creep properties of hot corrosion-resistant Ni-based single-crystal superalloys with varying Ta contents (2Ta, 5Ta, and 8Ta) during long-term thermal exposure at 900oC. The findings revealed that after various thermal exposure times, the addition of Ta had no observable influence on the size of γ' precipitates, but it considerably increased the cubic degree of γ' precipitates and continuously decreased the number of tertiary γ' precipitates in γ matrix. With the increase of Ta content from 2% to 5%, the volume fraction of γ' precipitates of 5Ta alloy is higher than that of 2Ta alloy except that which is close to each other when thermal exposure at 4000 h. In addition, the volume fraction of γ' precipitates increased was higher than that of 2Ta and 5Ta alloys, as the Ta content increased from 5% to 8% after various thermal exposure times. The creep lives of the three alloys at 900oC and 275 MPa exhibited different trends as thermal exposure time increased; there was no obvious fluctuation in the 2Ta alloy after thermal exposure from 0 to 4000 h, but it significantly decreased after thermal exposure at 8000 h; the creep lives of the 5Ta and 8Ta alloys increased initially and then decreased, and the peak creep lives were 500 and 2000 h, respectively. With the addition of Ta, the steady-state creep rate continuously decreased, the creep life significantly increased, and the peak creep life shifted backward. Simultaneously, the degree and structural integrity of the rafted γ' precipitates after creep rupture increased steadily. Hence, the improvement of the creep life of the alloys was attributed to a combination of factors, such as the increase in the volume fraction of the γ' precipitates in the initial state of the creep, the increase in rafted structural integrity, and thickness of the rafted γ' precipitates during the creep process.
LIU Jing , ZHANG Siqian , WANG Dong , WANG Li , CHEN Lijia . Effect of Ta on the Microstructure and Creep Properties of a Hot-Corrosion Resistant Ni-Based Single-Crystal Superalloy After Long-Term Exposure[J]. Acta Metall Sin, 2024 , 60(2) : 179 -188 . DOI: 10.11900/0412.1961.2022.00349
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