定向凝固涡轮叶片不同部位材料疲劳性能差异研究

Abstract

Abstract: Due to the geometry characteristics, the microstructure of different directional solidification (DS) blade regions is different during the solidification process, which suggests that the mechanical properties may also show variation among these regions. Three types of DS specimens (platform-like, shroud-like and notched) are designed to investigate the differences through high temperature low cycle fatigue tests. Tests results show that the fatigue performances of the shroud-like specimen and the platform-like specimen are respectively 7.68% and 5.93% those of the notched specimen. Therefore, the difference of fatigue property among different regions on a DS turbine blade should be considered in blade structure design and fatigue life prediction. The research results may also help to improve the fabrication processes of directional turbine blade solidification.

Key words: turbine blade, low cycle fatigue, blade-like specimen, directional solidification, microstructure

CLC Number:

V321.95

YAN Xiaojun, DENG Ying, SUN Ruijie, XIE Jianwen. Study of Fatigue Property Variation at Different Regions on a DS Turbine Blade[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2011, 32(10): 1930.

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Study of Fatigue Property Variation at Different Regions on a DS Turbine Blade

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