Abstract
Density and sintering temperature effects were investigated with FL4405 low alloy PM high strength steel. Room temperature, plane strain fracture toughness KIc, and constant amplitude fatigue crack growth with (min/max) load ratios of 0·05 and 0·5 and macroand microfractography were evaluated. Two density levels, 7·0 and 7·4 g cm−3, and two sintering temperatures, 1120 and 1315°C, were investigated. Increasing the density and sintering temperature had no influence on stress intensity threshold and near threshold fatigue crack growth resistance where transcrystalline/transparticle cleavage existed. At higher fatigue crack growth rates, where ductile dimples existed, both higher density and higher sintering temperature enhanced fatigue crack growth resistance. The KIc and Kmax values at fatigue crack growth fracture increased at the higher density and increased further at the higher sintering temperature. All final fracture regions were brittle at the macroscale while containing ductile dimples at the micro scale. No crack closure was found in fatigue crack growth tests and no load ratio effects were present at low fatigue crack growth rates. Significant load ratio effects were present at high fatigue crack growth rates. PM/0770
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.
