Abstract
In the recent years, directionally solidified (DS) turbine blades are found widely in advanced aero-engines owing to their excellent creep resistance properties. Aluminising coating on turbine blades protects against high temperature oxidation and corrosion. Turbine blades of a military gas turbine engine are subjected to low cycle fatigue (LCF) damage during START and STOP cycles. The present investigation deals with the low cycle fatigue (LCF) life of a directionally solidified nickel-base super alloy MAR M 002. Influence of aluminising on LCF life of the DS alloy MAR M002 has been evaluated by carrying out strain controlled LCF test at 900°C with strain amplitudes (Δet/2) of ±0.3%, ±0.5%, and ±0.8% at a strain ratio (R) of –1. At low strain, coating favours LCF life. Accumulated plastic strain and tensile stress developed during cyclic loading and stiffness ratio are being used to correlate fatigue life. Fractography revealed initiation of cracks in the coating and multiple secondary cracks.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: International Journal of Materials and Structural Integrity
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
