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Characterization and Modeling of Heat Affected Zone Microstucture in a Blast Resistant Steel

Yu, Xinghua
http://rave.ohiolink.edu/etdc/view?acc_num=osu1262201157

Abstract Details

2009, Master of Science, Ohio State University, Welding Engineering.
BlastAlloy 160 (BA-160) is a steel that was developed to meet the requirements for blast-resistant naval hull applications. In order to study the weldability of BA-160, a Gleeble thermal mechanical simulator was used to simulate the heat affected zone (HAZ) microstructure in BA-160. The influence of simulated HAZ thermal cycles on microstructure evolution of BA-160 was investigated by optical microscopy, secondary electron microscopy, atom probe tomography (APT) and electron backscatter techniques. Microhardness testing revealed anomalous strengthening behavior in the inter-critical heat affected zone (ICHAZ). Strengthening and softening in different regions of HAZ was studied by evaluating strengthening due to precipitate and martensite high misorientation boundaries.Coarsening and partial dissolution of Cu precipitates were observed in the sub-critical (SCHAZ) and ICHAZ. A low number density of Cu precipitates and high Cu concentration in the fine grained heat affected zone (FGHAZ) indicates the onset of Cu precipitate dissolution. Re-precipitation of Cu is found in the coarse grained heat affected zone (CGHAZ). Carbides were found to dissolve when the peak temperature of the HAZ is above 750°C. The segregation of Cu to grain boundaries was characterized by APT in ICHAZ and CGHAZ. The maximum concentration at the boundary was as high as 20 at. %. Finally, a model for Cu precipitate dissolution is proposed to explain dissolution phenomenon during welding.
Sudarsanam Babu, PhD (Advisor)
John Lippold, PhD (Committee Member)
115 p.
Materials Science; Metallurgy
Blast Resistant Steel; Heat Affected Zone; Atom Probe tomography; Cu precipitates; Cu segregationm

Recommended Citations

Citations

  • Yu, X. (2009). Characterization and Modeling of Heat Affected Zone Microstucture in a Blast Resistant Steel [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1262201157

    APA Style (7th edition)

  • Yu, Xinghua. Characterization and Modeling of Heat Affected Zone Microstucture in a Blast Resistant Steel. 2009. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1262201157.

    MLA Style (8th edition)

  • Yu, Xinghua. "Characterization and Modeling of Heat Affected Zone Microstucture in a Blast Resistant Steel." Master's thesis, Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1262201157

    Chicago Manual of Style (17th edition)

osu1262201157
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© 2009, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.