Abstract
The effects ofβ heat treatment andβ-work on microstructure and high temperature low cycle fatigue properties of Ti-5Al-5Sn-2Zr-2Mo-0.25Si were investigated. Strain control tests at total strains ranging from 1.2 to 2.5 pct were conducted at 427, 482, and 538 °C with frequencies of 10 and 0.4 cpm. The results showed shorter fatigue life at the higher temperature and lower frequency for all microstructural conditions.β-worked material with shorterα-platelet structure showed the highest fatigue strength for all test conditions. At these high temperatures, fatigue cracks initiate along theα/β interfaces with longer initial cracks in theβ-annealed condition which had longer interfaces. It is suggested that oxygen diffusion along theα/β interfaces is responsible for surface connected interfacial cracking leading to the observed temperature and frequency dependence. The better HTLCF life of theβ-worked material is related to the shorter initial interface cracks.
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 callDisclaimer: 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.
