Iranian Journal of Mechanical Engineering Transactions of ISME

Iranian Journal of Mechanical Engineering Transactions of ISME

Remaining Creep Life Assessment of Gas Turbine Blade Made of IN 792 ‎Nickel-Base Superalloy

Authors
Abstract
During the operation, the turbine blades of hot gas path suffer service induced degradation due to ‎different causes such as creep, fatigue, oxidation, corrosion and etc. The present study was carried ‎out the effect of long-term service at the high temperature exposure to remaining life assessment gas ‎turbine blade made of Inconel 792 nickel base superalloy. That is investigated by studying on ‎microstructure by optical and scanning electron microscopy, mechanical properties such as high ‎temperature tensile and stress-rupture test and stress analyses of turbine blade. The result has been ‎shown the gamma prime rafting and TCP phase formation has occurred at the microstructure. ‎Because of long-term service at high temperature, stress- rupture properties of blade reduced and ‎‎20% lower than new IN 792 alloys. The stress analyses with ANSYS software and creep life ‎assessment results by use Larson-miller parameter, the safety factor of blade lower than 1 and life ‎time of turbine blade is finished.‎
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Volume 18, Issue 3 - Serial Number 44
System Dyanamics and Solid Mechanics
Autumn 2016
Pages 6-18

  • Receive Date 06 November 2014
  • Revise Date 25 November 2015
  • Accept Date 30 November 2016