Abstract
Cold deformation is effective in significantly improving the strength of engineering materials while avoiding surface oxidation caused by hot deformation. However, the underlying mechanisms of cold deformation impacting the mechanical properties of superalloys remain ambiguous. In this study, a Fe-Ni-Cr superalloy was pre-strained to various degrees by cold drawing to investigate the effect of cold deformation on its microstructure and mechanical properties. The initial non-textured microstructure before deformation is observed to gradually transform into< 111 > and< 100 > fiber textures by the application of pre-strains. Detailed X-ray diffraction and transmission electron microscopy reveal that the deformation mechanisms transform from dislocation slip at low pre-strains (<0.47) to nanotwinning at high pre-strains (>0.47). A novel twinning-detwinning process at high pre-strains was identified to be responsible for the achieved good combination of an ultra-high yield strength of 967 MPa and a reasonable elongation of 12 % for the studied alloy. The mechanism and corresponding impacts of cold deformation on mechanical properties identified in this study can serve as a crucial step in designing ultra-high-performance superalloys.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
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.