Abstract
Fatigue tests have been performed to investigate the effect of strain aging on the fatigue limit and fatigue crack behavior about two kinds of austenitic stainless steels, SUS 304 and nitrogen contained SUS 304 (SUS 304 N). From the testing results, the fatigue limits of SUS 304 and SUS 304 N increase by 5 and 30 MPa, respectively by the low temperature annealing (300°C×2h) during fatigue test by the specified cyclic ratio under constant higher stress amplitude than their original fatigue limits. It is considered that the effect of strain aging by nitrogen in SUS 304 N increases its fatigue limit. However, the specimens, in which the fatigue micro-cracks in the length of 1∼2 grains sizes exist under the higher stress amplitude than the fatigue limit of each material, propagate to be a final fracture before 1×107 cycles under the same original stress amplitude of fatigue limit, even if the specimens were annealed in the vacuum at low temperature.
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: TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A
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.
