Abstract
Two unique morphologies of Mo/sub 2/C are attainable through isothermal heat treatments of Fe-C-Mo steels. Specifically, both a fibrous carbide structure and an interphase needle carbide structure (i.e., the needles are arranged in layers or sheets) can be produced. The monotonic behavior of an Fe-0.2C-4Mo alloy has shown that the dense carbides contribute significantly to the total yield strength in these microstructures. This study considers the strengthening of these two different carbide distributions and morphologies on the basis of Orowan strengthening. This allows for the evaluation of Orowan strengthening predictions for the two different Mo/sub 2/C precipitate distributions. Two alloys, nominally Fe-0.2C-4Mo and Fe-0.2C-2Mo were used. The alloys were encapsulated in quartz and homogenized for 4 days at 1200/sup 0/C. The final heat treatment consisted of austenization for 30 minutes at 1250/sup 0/C, and quenching into nitrate salt at 625 or 725/sup 0/C for the times specified for each alloy. This produced dual-phase microstructures consisting of 60 pct ferrite and Mo/sub 2/C surrounding equiaxed martensite (40 pct) packets.
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.
