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Advanced High Strength Steel Through Paraequilibrium Carbon Partitioning and Austenite Stabilization

Qu, Hao
http://rave.ohiolink.edu/etdc/view?acc_num=case1283353953

Abstract Details

2011, Master of Sciences, Case Western Reserve University, Materials Science and Engineering.
Research has been conducted on third generation advanced high strength steels to determine the amount of retained austenite that can be produced by quench and partitioning heat treatments. Computer coupling of phase diagrams and thermochemistry based thermodynamic simulation software has been used to design the steel compositions and heat treatment parameters. Direct quench, interrupted quench and double stabilization heat treatments were conducted to study the phase transformation behavior in candidatesteels containing 0.1 to 0.3 wt. pct. carbon content. The amount of retained austenite phase was measured using an X-ray diffraction technique. Scanning electron microscopy and transmission electron microscopy were employed to analyze the size and distribution of the phases created by the different heat treatments. Up to 13 vol. pct. of retained austenite was found in the steel after a double stabilization heat treatment. The final microstructure consists of ferrite, lath martensite and retained austenite grains in the size range of 200 to 300 nm. Partitioning of alloying elements manganese, aluminum and silicon between austenite and ferrite during the initial austenitization heat treatments at 900 °C for 60 seconds was observed by using energy dispersive X-ray spectroscopy. In addition, hardness testing was carried out and correlated with the microstructural features found in the heat treated steels.
Gary Michal, PhD (Advisor)
Arthur Heuer, PhD (Committee Member)
Lewandowski John, PhD (Committee Member)
Engineering; Materials Science
AUSTENITE; Retained Austenite; pct; STEEL; Quench; final quench; Heat Treatments

Recommended Citations

Citations

  • Qu, H. (2011). Advanced High Strength Steel Through Paraequilibrium Carbon Partitioning and Austenite Stabilization [Master's thesis, Case Western Reserve University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=case1283353953

    APA Style (7th edition)

  • Qu, Hao. Advanced High Strength Steel Through Paraequilibrium Carbon Partitioning and Austenite Stabilization. 2011. Case Western Reserve University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=case1283353953.

    MLA Style (8th edition)

  • Qu, Hao. "Advanced High Strength Steel Through Paraequilibrium Carbon Partitioning and Austenite Stabilization." Master's thesis, Case Western Reserve University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=case1283353953

    Chicago Manual of Style (17th edition)

case1283353953
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© 2010, all rights reserved.
This open access ETD is published by Case Western Reserve University School of Graduate Studies and OhioLINK.