Abstract
An arrest function of fatigue short crack growth from notch root at 200 and 550°C in air was investigated for Fe-20Cr alloy containing 1.1 weight percent of dispersed Y2O3 particles and for SUS403 (Fe-12Cr) and SUS304 (Fe-18Cr-8Ni) stainless steels containing 0.2 weight percent of dispersed Pb particles. The main conclusions obtained are as follows. The fatigue Iimits at the high temperatures were 40∼60% higher for the alloy containing dispersed Y2O3 particles and the stainless steels containing dispersed Pb perticles than for their base metals. Above the fatigue limit, the fatigue life was longer for the materials containing dispersed Y2O3 or Pb particles than for their base metals, because the growth rate of a fatigue short crack, which was initiated from the notch root, was low. Those improvements in high-temperature fatigue properties were explained, considering that the presence of Y2O3 or Pb particles strengthened the oxide film at the notch root or at the crack tip of a short crack. Accordingly, we concluded that Y2O3 and Pb dispersed particles show an arrest function of fatigue short crack growth at elevated temperatures.
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.
