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Dissertation by Chia-Jung Chen.pdf (5.97 MB)

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OPTIMIZATION OF MECHANICAL PROPERTIES IN A356 VIA SIMULATION AND PERMANENT MOLD TEST-BARS

Chen, Chia-Jung
http://rave.ohiolink.edu/etdc/view?acc_num=case1386184784

Abstract Details

2014, Doctor of Philosophy, Case Western Reserve University, Materials Science and Engineering.
Using as-cast test bars is a quick and convenient method of determining as-cast metal quality in the foundry--although such results are only representative of the section of a casting solidifying at the same rate as the test-bar. Unfortunately the current standard test-bar mold suffers from shrinkage porosity which detracts from best properties. In this work computer simulation has been utilized to predict and design an improved permanent mold test bar mold. A356 and 319 alloys have been melted and treated with best metal cleaning practices (degassing, filtration) in order to assess the effect of clean metal as a baseline of this research prior to microstructural enhancements (modification, grain refinement, SDAS). The results show that with a knife-ingate in the re-designed test-bar mold, better as-cast properties can be obtained on a more consistent basis throughout a varying mold temperature range. With best in-furnace clean metal practice and virgin ingot, applying filters in the test bar mold have minimal effect, but show that filtration is beneficial if melting recycled metal. In the standard heat treated T6 condition, the new test-bar mold delivers superior mechanical properties as measured by the Quality Index method.
David Schwam (Advisor)
John Lewandowski (Committee Chair)
Gerhard Welsch (Committee Member)
Malcolm Cooke (Committee Member)
106 p.
Materials Science; Metallurgy
Aluminum alloy, filtration, grain refining, gating system

Recommended Citations

Citations

  • Chen, C.-J. (2014). OPTIMIZATION OF MECHANICAL PROPERTIES IN A356 VIA SIMULATION AND PERMANENT MOLD TEST-BARS [Doctoral dissertation, Case Western Reserve University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=case1386184784

    APA Style (7th edition)

  • Chen, Chia-Jung. OPTIMIZATION OF MECHANICAL PROPERTIES IN A356 VIA SIMULATION AND PERMANENT MOLD TEST-BARS. 2014. Case Western Reserve University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=case1386184784.

    MLA Style (8th edition)

  • Chen, Chia-Jung. "OPTIMIZATION OF MECHANICAL PROPERTIES IN A356 VIA SIMULATION AND PERMANENT MOLD TEST-BARS." Doctoral dissertation, Case Western Reserve University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=case1386184784

    Chicago Manual of Style (17th edition)

case1386184784
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© 2014, all rights reserved.
This open access ETD is published by Case Western Reserve University School of Graduate Studies and OhioLINK.