Temper Bead Welding for Dissimilar Metal Welds and Overlays
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The Ohio State University / OhioLINK
2019
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| Online Access: | http://rave.ohiolink.edu/etdc/view?acc_num=osu1574840746589766 |
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ndltd-OhioLink-oai-etd.ohiolink.edu-osu15748407465897662021-08-03T07:13:26Z Temper Bead Welding for Dissimilar Metal Welds and Overlays Stewart, Jeffrey Materials Science 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. 2019 English text The Ohio State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=osu1574840746589766 http://rave.ohiolink.edu/etdc/view?acc_num=osu1574840746589766 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws. |
| collection |
NDLTD |
| language |
English |
| sources |
NDLTD |
| topic |
Materials Science Engineering |
| spellingShingle |
Materials Science Engineering Stewart, Jeffrey Temper Bead Welding for Dissimilar Metal Welds and Overlays |
| author |
Stewart, Jeffrey |
| author_facet |
Stewart, Jeffrey |
| author_sort |
Stewart, Jeffrey |
| title |
Temper Bead Welding for Dissimilar Metal Welds and Overlays |
| title_short |
Temper Bead Welding for Dissimilar Metal Welds and Overlays |
| title_full |
Temper Bead Welding for Dissimilar Metal Welds and Overlays |
| title_fullStr |
Temper Bead Welding for Dissimilar Metal Welds and Overlays |
| title_full_unstemmed |
Temper Bead Welding for Dissimilar Metal Welds and Overlays |
| title_sort |
temper bead welding for dissimilar metal welds and overlays |
| publisher |
The Ohio State University / OhioLINK |
| publishDate |
2019 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=osu1574840746589766 |
| work_keys_str_mv |
AT stewartjeffrey temperbeadweldingfordissimilarmetalweldsandoverlays |
| _version_ |
1719456717617496064 |