Heat Treatment of Metals ›› 2021, Vol. 46 ›› Issue (6): 213-220.DOI: 10.13251/j.issn.0254-6051.2021.06.042

• MICROSTRUCTURE AND PROPERTIES • Previous Articles     Next Articles

Microstructure and properties of a gas turbine blade after long-term service

Yang Jinping1, Song Guobin1, Dong Yongjun2, Cui Chong2, Duan Wenfeng3, Shi Quanqiang4,5, Shan Yiyin4,5   

  1. 1. Guodian North China Power Co., Ltd., Beijing 100070, China;
    2. Guodian Research Institute of Science and Technology Co., Ltd., Nanjing Jiangsu 210023, China;
    3. School of Materials and Metallurgy, University of Science and Technology Liaoning, Anshan Liaoning 114051, China;
    4. Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang Liaoning 110016, China;
    5. Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang Liaoning 110016, China
  • Received:2021-01-20 Online:2021-06-25 Published:2021-07-21

Abstract: Microstructure and creep rupture property of a gas turbine blade at different positions after 45 000 h cumulative operation were researched. The experimental results show that the microstructure of the tenon tooth blade has no obvious degradation, however, the microstructure degrades obviously for the leading edge on the section near blade tip, in which the MC-type carbides are degraded and decomposed, and the cubic γ′ phase degenerates into coarse spherical γ′ phase. After long-term service, the blade hardness has no obvious change, however, the creep rupture strength reduces obviously and the extrapolation rupture strength of the gas turbine blade at 850 ℃ for 105 h reduces to 66.72 MPa.

Key words: gas turbine blade, microstructure, γ′ phase, creep rupture property

CLC Number: