Abstract
In the present paper, a 0Cr17Ni10Mn5Mo2 steel was treated with different hot extrusion processes to obtain three different microstructures, namely, single austenite, austenite with thin-striped shaped δ-ferrite, and austenite with thin-sheet shaped δ-ferrite. Cyclic deformation tests were conducted on the test steel with microstructures described above. Cyclic deformation microstructures were characterized by optical microscope, electron backscatter diffraction technique and transmission electron microscopy. Results showed that the fatigue lives of the test steels containing δ-ferrite were longer than that with single austenite. At the total strain amplitude of 0.8%, cyclic hardening followed by softening occurred in the test steel containing δ-ferrite at the initial stage of cyclic deformation. Secondary hardening was observed in the subsequent cyclic deformation in the test steel containing thin-sheet shaped δ-ferrite. The hard lamellae of δ-ferrite and fine austenite grains reduced the plastic strain amplitude and dislocation multiplication rate in the test steel. Therefore, cyclic softening behavior was induced. With the increase of size and quantity of δ-ferrite and adjacent grains, the plastic strain amplitude and dislocation multiplication rate were elevated, leading to increased cyclic stress and secondary hardening behavior.
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.
