Abstract
Effects of hot working on elevated temperature tensile and creep rupture properties at 1000°C were investigated in powder metallurgy(PM) Ni-base alloy, Alloy X, with 50 ppm oxygen content consolidated by hot extrusion process in comparison with cast and wrought materials. It was found that the ductility of PM material at temperatures above 850°C was improved by the application of hot forging while the tensile strength was relatively unchanged. Furthermore, it was found that creep rupture properties of PM materials were not significantly affected by extrusion ratio ranging from 6 to 25, but improved by hot forging. Although aluminum oxides originating from powder surface oxidation during atomization aligned along grain boundaries in the extruded material, these oxides were redistributed within grains by nonuniform deformation of hot forging. It was considered that the improvement of creep rupture properties was realized by a decrease in cavity formation initiated at oxides at grain boundaries.
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 callMore From: Journal of the Japan Society of Powder and Powder Metallurgy
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.
