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The Effect of Solutionizing Heat Up Rate and Quench Rate on the Grain Size and Fracture Mode of a 6061 Alloy Pressure Vessel

Kulpinski, Kyle E.
http://rave.ohiolink.edu/etdc/view?acc_num=case1334239996

Abstract Details

2012, Master of Sciences (Engineering), Case Western Reserve University, Materials Science and Engineering.
Current production techniques for large diameter 6061 alloy seamless pressure vessels can lead to cylinder heads with regions of large (1mm+) grains that fracture in a low ductility intergranular fashion along the circumference of the head during proof tests. This phenomena and fracture mode was reproduced in commercially produced cylinders by a combination of slow strain rate (10-6/s) 4-point bending and controlled surface strain experiments. As-spun heads were commercially produced and given solution heat treatments at CWRU via either a salt bath or an induction coil, the former followed by quenching at rates from 180°C/s to 18°C/s. The effects of these different heat treatments on the resulting grain size, crack resistance and fracture mode were compared to the standard commercial treatments. Induction heated samples produced grain sizes below 150 µm and exhibited a significantly higher crack resistance, fracturing in a transgranular ductile manner.
John Lewandowski, PhD (Advisor)
Gary Michal, PhD (Committee Member)
David Schwam, PhD (Committee Member)
Henry Holroyd, PhD (Other)
Aerospace Materials; Materials Science; Metallurgy
aluminum; grain growth; pressure vessel; fracture; solution heat treatment; heat treatment

Recommended Citations

Citations

  • Kulpinski, K. E. (2012). The Effect of Solutionizing Heat Up Rate and Quench Rate on the Grain Size and Fracture Mode of a 6061 Alloy Pressure Vessel [Master's thesis, Case Western Reserve University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=case1334239996

    APA Style (7th edition)

  • Kulpinski, Kyle. The Effect of Solutionizing Heat Up Rate and Quench Rate on the Grain Size and Fracture Mode of a 6061 Alloy Pressure Vessel. 2012. Case Western Reserve University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=case1334239996.

    MLA Style (8th edition)

  • Kulpinski, Kyle. "The Effect of Solutionizing Heat Up Rate and Quench Rate on the Grain Size and Fracture Mode of a 6061 Alloy Pressure Vessel." Master's thesis, Case Western Reserve University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=case1334239996

    Chicago Manual of Style (17th edition)

case1334239996
3,037
© 2012, all rights reserved.
This open access ETD is published by Case Western Reserve University School of Graduate Studies and OhioLINK.