216 Int. J. Mech. Eng. & Rob. Res. 2015 Rajni Dewangan et al., 2015 GAS TURBI NES BLADES—A CRI TI CAL REVI EW OF FAI LURE ON FI RST AND SECOND STAGES Rajni Dewangan 1 * , Jaishri Patel 1 , Jaishri Dubey 1 , Prakash Kumar Sen 1 and Shailendra Kumar Bohidar 1 * Corresponding Author: Rajni Dewangan,  rajnidewangan161@gmail.com Gas turbine blades have numerous applications in the aerospace industry. In this study, the stresses and deformations of a turbine were studied. The goal was to highlight the stress and deformation distribution to assist in the design of a blades. The stresses and deformations developed as a result of the blade operating conditions at high rotational speeds and thermal gradients were evaluated using two types of heat transfer modes-conduction and convection, taking into consideration the material behavior at elevated temperatures. The greatest stresses in the blades result from the thermal load caused by conduction, and they are located between the blades and disc. In addition an analytical method was used to evaluated and predict the stresses along the blades it gave a good estimate of the stress values compared to the finite element. It is important to design for as high temperatures gas as possible in order to attain a high thermal efficiency in gas turbines. In the case of power generating gas turbines, the increase of temperature leads to lower fuel consumption, reduced pollution and thus lower costs. Keywords: Fretting fatigue, Super alloy, Failure analysis, Elevated temperature I NTRODUCTI ON Turbine components (rotor disks, blades, blade attachments) are heavy duty components which can be classified as critical components. Gas turbine blades are made of nickel-base and cobalt-base super alloys principally. During the past few decades, the operating temperatures of gas turbine engines have been on the rise to achieve higher and higher engine power and efficiency. This has ISSN 2278 – 0149 www.ijmerr.com Vol. 4, No. 1, January 2015 © 2015 IJMERR. All Rights Reserved Int. J. Mech. Eng. & Rob. Res. 2015 1 Mechanical Engg. Department, Kirodimal Institute of Technology, Raigarh, Chhattisgarh, India. necessitated a continuing advancement in the temperature withstanding capabilities of materials used in the air construction (Bhaumik and Sujata, 2006). Gas turbine blades are critical components in power plants which in the event of their failure the power plants will shut down. This case can cause long time current failure and economic loss. Therefore, it is necessary to settle the failure analysis of turbine blades in order to Review Aticle