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Low Temperature Carburization of Ferritic Stainless Steels

Katz, Joshua H.
http://rave.ohiolink.edu/etdc/view?acc_num=case1256605313

Abstract Details

2009, Master of Sciences (Engineering), Case Western Reserve University, Materials Science and Engineering.
Ferritic stainless steels with a high chromium content were case hardened at 350 to 420° C using a carburization technique developed by the Swagelok company. This carburization treatment applied to body-centered cubic ferritic stainless steels has resulted in a case only a few microns thick in contrast to the 20 to 40 micron thick casesproduced in face-centered cubic austenitic stainless steels carburized at 450 to 470° C. This situation has been investigated using CALPHAD based thermodynamic simulation techniques to explore the possible formation of carbides having the same composition of metal elements as their ferritic matrix, i.e. paraequilibrium carbides. Experimental work has included X-ray Diraction (XRD), hardness measurements, metallographic analysis using Scanning Electron Microscopy (SEM), Auger Electron Spectroscopy, X-ray Photoelectron Spectroscopy (XPS), and Transmission Electron Microscopy (TEM). Both the simulation and the experimental work indicate that paraequilibrium carbides are forming a layer in the near surface region that creates a barrier which greatly restricts carbon diffusion into the ferrite phase during the carburization treatments.
Gary Michal, PhD (Advisor)
Frank Ernst, PhD (Committee Member)
Arthur Heuer, PhD (Committee Member)
John Lewandowski, PhD (Committee Member)
162 p.
Engineering; Materials Science; Metallurgy
carburization; ferritic stainless steel; thermodynamics; CALPHAD; paraequilibrium; carbide

Recommended Citations

Citations

  • Katz, J. H. (2009). Low Temperature Carburization of Ferritic Stainless Steels [Master's thesis, Case Western Reserve University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=case1256605313

    APA Style (7th edition)

  • Katz, Joshua. Low Temperature Carburization of Ferritic Stainless Steels. 2009. Case Western Reserve University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=case1256605313.

    MLA Style (8th edition)

  • Katz, Joshua. "Low Temperature Carburization of Ferritic Stainless Steels." Master's thesis, Case Western Reserve University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=case1256605313

    Chicago Manual of Style (17th edition)

case1256605313
659
© 2009, all rights reserved.
This open access ETD is published by Case Western Reserve University School of Graduate Studies and OhioLINK.