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Dissertation_GuilhermeAbreuFaria.pdf (5.11 MB)

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Investigation of a CalPhaD Approach for the Prediction of Solidification Segregation and its Effect on Solid State Transformations

Abreu Faria, Guilherme
http://orcid.org/0000-0002-9233-263X
http://rave.ohiolink.edu/etdc/view?acc_num=osu157441443446564

Abstract Details

2019, Doctor of Philosophy, Ohio State University, Welding Engineering.
During solidification of multi-component systems, composition partition between the liquid and solid phases is inevitable in most practical applications. This partition induces a segregation profile in the solid phase, which may affect solid-state transformation behavior. Several models exist both to address the formation of this segregation profile and solid-state phase transformations. The ability to model the full history of the material allows for digital testing of manufacturing process parameters, new alloy compositions and post solidification heat treatments. In this work, we investigate a modelling approach which uses several CalPhaD based models to follow the materials history and the phase transformations taking place during it. The basis and outline are presented and the modelling approach is applied to follow two cases, Cu phase formation in a Grade 91 Creep Strength Enhanced Ferritic Steel and solidification and phase transformations in a non-homogenized alloy 718 material produced through Laser powder bed additive manufacturing. The results of the model application are presented in article form. The first article correlates creep damage to second phase particles coming from solidification. The second article establishes a mechanism for the formation of a Cu phase layer around the second phase particles. The third article compares results of the Scheil model to segregation maps in as-built additively manufactured alloy 718. The fourth article uses a modelled segregation profile in alloy 718 to model δ phase formation in a heat treatment of the non-homogenized sample, and compares results with in-situ x-ray diffraction quantification of the δ phase. The document concludes with an analyses of the accuracy of the modelling approach and a discussion of the sensibility of the model to its inputs.
Antonio Ramirez (Advisor)
Carolin Fink (Committee Member)
Wei Zhang (Committee Member)
210 p.
Materials Science
CalPhaD, segregation, phase transformations

Recommended Citations

Citations

  • Abreu Faria, G. (2019). Investigation of a CalPhaD Approach for the Prediction of Solidification Segregation and its Effect on Solid State Transformations [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu157441443446564

    APA Style (7th edition)

  • Abreu Faria, Guilherme. Investigation of a CalPhaD Approach for the Prediction of Solidification Segregation and its Effect on Solid State Transformations. 2019. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu157441443446564.

    MLA Style (8th edition)

  • Abreu Faria, Guilherme. "Investigation of a CalPhaD Approach for the Prediction of Solidification Segregation and its Effect on Solid State Transformations." Doctoral dissertation, Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu157441443446564

    Chicago Manual of Style (17th edition)

osu157441443446564
692
© 2019, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.