Abstract
This paper describes the fatigue behaviour at elevated temperatures in a ferritic stainless steel, type 444. Test temperatures evaluated were ambient temperature, 673K and 773K in laboratory air. Fatigue strength decreased at elevated temperatures compared with at ambient temperature. At all temperatures, cracks were generated at the specimen surface due to cyclic slip deformation, but fractographic analysis revealed a brittle features in fracture surface near the crack initiation site at elevated temperatures. Cracks initiated earlier at elevated temperatures than at ambient temperature and subsequent small cracks grew faster at elevated temperatures even though the difference in elastic modulus was taken into account, indicating the decrease in crack initiation resistance and crack growth resistance. The observed decrease in both resistances was discussed in relation to the 748K(475C) embrittlement in ferritic stainless steels.
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 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.
