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EVALUATING SERVICE TEMPERATURE FIELD OF HIGH PRESSURE TURBINE BLADES MADE OF DIRECTIONALLY SOLIDIFIED DZ125 SUPERALLOY BASED ON MICRO-STRUCTURAL EVOLUTION |
Yadong CHEN1,Yunrong ZHENG1,Qiang FENG1,2() |
1 State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China 2 Beijing Key Laboratory of Special Melting and Reparation of High-End Metal Materials, University of Science and Technology Beijing, Beijing 100083, China |
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Cite this article:
Yadong CHEN, Yunrong ZHENG, Qiang FENG. EVALUATING SERVICE TEMPERATURE FIELD OF HIGH PRESSURE TURBINE BLADES MADE OF DIRECTIONALLY SOLIDIFIED DZ125 SUPERALLOY BASED ON MICRO-STRUCTURAL EVOLUTION. Acta Metall Sin, 2016, 52(12): 1545-1556.
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Abstract To get the actual service temperature distribution of turbine blades in aeroengines is very important for the design and maintenance. However, the acquisition of service temperature distribution has always been a challenge due to the complex and severe working condition of turbine blades. In this work, one turbine blade made of directionally solidified DZ125 superalloy was investigated after the service in air for 900 h. The microstructural evolution of DZ125 superalloy after thermal exposure at 900~1100 ℃ without the stress in different time period was also investigated, for comparison. According to microstructural degradation behaviors in the dendritic region, interdendritic region, carbides and grain boundary of DZ125 superalloy before and after service, the volume fraction of γ precipitates in the dendritic region was determined as the quantitative characterization parameter. A method to evaluate the service temperature of turbine blades was developed, based on the quantitative characterization of microstructural evolution, such as the relationship between the thermally exposured temperature and volume fraction of γ precipitates. The equivalent average service temperature (Tave) and the equivalent maximum service temperature (Tmax) were proposed based on the assumption of the constant temperature during service and the nearly service condition with variable temperature of blades, respectively. The results indicate that the service temperature was higher in the middle of the blade, and became lower at the locations closer to the tip or the root. For each cross-section, the service temperatures of the serviced blade in the descending order were leading edge, pressure side, trailing edge and suction side. The highest service temperature of 1050~1100 ℃ appeared at the leading edge in the middle of the blade. The distribution trend of Tave agreed well with that of Tmax, but Tmax was higher than Tave in some locations of the blade. This work suggests that the evaluation results of Tmax were more reasonable than those of Tave. This method would be helpful to establish the assessment method of the service-induced microstructural damage in turbine blades made of directionally solidified superalloys.
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Received: 03 May 2016
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Fund: Supported by National High Technology Research and Development Program of China (No. 2012AA03A513) and Science Foundation of Ministry of Education of China (No. 625010337) |
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