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Dissertation Stewart.pdf (14.76 MB)

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Temper Bead Welding for Dissimilar Metal Welds and Overlays

Stewart, Jeffrey
http://rave.ohiolink.edu/etdc/view?acc_num=osu1574840746589766

Abstract Details

2019, Doctor of Philosophy, Ohio State University, Welding Engineering.
A welding continuous cooling transformation (CCT) diagram was developed for a heat of Grade 22 steel that gave a range of t8/5 times over which a full martensitic transformation occurs as opposed to a mixed martensitic/bainitic transformation. A method of quantifying the tempering response in Grade 22 steel was developed to estimate changes in hardness as a result of the thermal history experienced in the HAZ of multi-pass welds. A method to quantify non-isothermal tempering cycles by converting them into equivalent isothermal cycles was utilized in conjunction with the Grange-Baughman parameter (GBP) to correlate tempering cycles with hardness. This method was extended to apply to multiple tempering cycles as seen in temper bead welding and hardness predictive equations were able to be developed using this approach. The peak temperature of tempering cycles was also used to develop hardness predictive equations for both single and multiple tempering cycles. An algorithm to predict microstructure types as a function of thermal history for locations in the HAZ was developed and utilized the hardness prediction equations to estimate resulting hardness. Additional tempering efficiency metrics provide tools to improve procedure optimization. The carbides that developed during tempering of Grade 22 steel were studied, and the results indicate that as tempering level increase, fine carbides precipitate in a more evenly distributed manner than the carbides present in normalized and tempered base metal. In addition, the carbide type likely begins to transition from M3C/M7C3 to M23C6 as the more tempering cycles are applied.
Boian Alexandrov, Dr. (Advisor)
Avraham Benatar, Dr. (Committee Member)
David Phillips, Dr. (Committee Member)
186 p.
Engineering; Materials Science

Recommended Citations

Citations

  • Stewart, J. (2019). Temper Bead Welding for Dissimilar Metal Welds and Overlays [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1574840746589766

    APA Style (7th edition)

  • Stewart, Jeffrey. Temper Bead Welding for Dissimilar Metal Welds and Overlays. 2019. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1574840746589766.

    MLA Style (8th edition)

  • Stewart, Jeffrey. "Temper Bead Welding for Dissimilar Metal Welds and Overlays." Doctoral dissertation, Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1574840746589766

    Chicago Manual of Style (17th edition)

osu1574840746589766
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© 2019, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.