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Study of the Microstructure of the Gas Turbine Internal Blade

Nurul Najat binti Ahmad, Nurul Najat (2011) Study of the Microstructure of the Gas Turbine Internal Blade. Universiti Teknologi Petronas, Sri Iskandar, Tronoh, Perak. (Unpublished)

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High Pressure Turbine (HPT) first stage blade is the most important rotational components of aero-engine. It operatesat high temperature and under conditions of extreme environmental attack such as oxidation and corrosion, isespecially subjected to degradation by oxidation, corrosion and wear. Due to the elevated temperature been introduced on the turbine blades, they faced several failure such as thermal stress failure and creep. This failure is very common and always occurred on this life limiting component of gas turbine. Further study on the microstructure behavior with respect to the temperature along the blade is carried out to predict the cycle life of the blade. The objective of this project is basically to study on the microstructure of Nickel based Superalloy characterization. The study is mainly focusing on the evaluation of the morphology changeof the γ′particles, carbide precipitation and characterization of particle type and size.Then, a complete procedure and testing related with the study of gas turbine blades were performed using relevant equipment and tools.The procedure involves preparing metallographic sample, chemical analysis and analyzing the microstructure under FESEM and EDS. Though, the main objective of this project is to create a complete profile of microstructure along the turbine blade. This profile is believed to be very useful in the industry to predict the cycle life of turbine blade. Thorough analysis been done,the microstructure undergoes transformations which likely degrade the mechanical properties of the alloy, including γ’ coarsening, increased carbide precipitation in grain boundaries, andincreasinggrain size with respect to temperature. From the analysis, we can predict the temperature profile alongside the blade, which is increase from lower part to upper part. Therefore, the operating temperature of gas turbine need to be maintain so that the microstructure of blade is not affected and as well reduce the lifespan of turbine blade.

Item Type: Final Year Project
Subject: T Technology > TJ Mechanical engineering and machinery
Divisions: Engineering > Mechanical
Depositing User: Users 5 not found.
Date Deposited: 21 May 2012 12:04
Last Modified: 25 Jan 2017 09:41
URI: http://utpedia.utp.edu.my/id/eprint/2416

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