|About this Abstract
||Materials Science & Technology 2019
||Late News Poster Session
||P1-71: Microstructural Evaluation of an Overheated Gas Turbine Blade
||Xiaotong Guo, Weiwei Zheng, Longfei Li, Stoichko Antonov, Yunrong Zheng, Qiang Charles Feng
|On-Site Speaker (Planned)
||Qiang Charles Feng
Gas turbine blades may suffer overheating during service which could cause serious microstructural degradation and even failure. Nonetheless, limited studies focus on microstructural evaluation in overheated turbine blades. In this work, microstructural investigation was conducted in an overheated failed turbine blade made of equiaxed-cast superalloy with Al-Si coating. By quantitatively characterizing several microstructural features, the microstructure of the serviced blade was evaluated and the equivalent maximum service temperature was estimated. It is suggested that most locations of this blade had been operating at normal temperature. And only the blade tip had suffered overheating at almost 200°C above normal service temperature due to the coating spalled off. The overheating led to incipient melting and material loss at the blade tip. This study could provide a reference for the evaluation of microstructural degradation in overheated cast turbine blades.