Abstract
There are three stages of gas turbine blade in hot gas path (turbine section) of power generation gas turbine. Occurrences of wear and crack were observed on gas turbine blades in this section. The blades are made of nickel base superalloy (GTD 111). Crack generally occurred at airfoil area of the blades while wear generally occurred at root area of the blades. The purpose of this study is to determine the degradation of two stages blades in the turbine section after being exposed to 24,000 running hours. The affected areas of the mating surfaces were analyzed through visual and microstructure testings and the type of degradation was discussed.
Highlights
Nickel base superalloys are widely used in applications exposed to high temperature and vibration such as hot gas path components in power generation gas turbine
Based on previous investigation of wear and crack on gas turbine blades, most blades suffer severe operation conditions characterized by the following factors: operation environment and mechanical action [2]
This study focuses on the degradation of gas turbine blades, which have been taken out at the earlier than their design life, which is at 24,000 hours for visual and microstructure evaluation
Summary
Nickel base superalloys are widely used in applications exposed to high temperature and vibration such as hot gas path components in power generation gas turbine. Based on previous investigation of wear and crack on gas turbine blades, most blades suffer severe operation conditions characterized by the following factors: operation environment (high temperature) and mechanical action (relative movement between and forces between blade root and its supporters) [2]. There are many study conducted on gas turbine blades based on their design life of 72,000 hours. Bernstein had revealed that for gas turbine hot section components, wear and crack are most important for turbine hardware at their design life [5]. This study focuses on the degradation of gas turbine blades, which have been taken out at the earlier than their design life, which is at 24,000 hours for visual and microstructure evaluation
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