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Steam Oxidation Resistance of Shot Peened Austenitic Stainless Steel Superheater Tubes

Tossey, Brett M.
http://rave.ohiolink.edu/etdc/view?acc_num=osu1306261300

Abstract Details

2011, Master of Science, Ohio State University, Materials Science and Engineering.
Steam-side oxidation and the resultant exfoliation of iron-based scales cause unplanned shutdowns at coal-fired power generation facilities. Exfoliation mitigation is currently limited to frequent unit cycling to minimize the volume of exfoliated scale and upgrading a plant with a “blow down” system. This thesis discusses the rate of steam-side oxidation on Type 304H stainless steel (304H) and Type 347H Stainless steel tube after shot peening the internal surface with commercially available techniques. Shot peening the ID of Type 304H austenitic stainless steel superheater tubes has been shown to improve the overall oxidation resistance in steam. Decreasing the oxidation rate directly impacts the exfoliation rate. The adherent spinel scales are thinner and more robust than non-shot peened tubes of the same alloy. Most of the improved oxidation resistance can be attributed to the presence of a spinel oxide layer combined with a continuous chromia layer formed near the steam-touched surfaces. The presence of a continuous chromia layer greatly reduces the outward diffusion of iron and minimizes the formation of iron-based scales that exfoliate. This work showed that a uniform cold-worked layer along the tube ID has a profound effect on oxidation resistance. Incomplete coverage allows oxidation to occur in the non-hardened regions at a rate comparable to the oxidation rate on unpeened Type 304H. Type 347H resisted oxidation to a greater degree than 304H due to a finer grain size and higher residual compressive stress.
Dr. Gerald Frankel (Advisor)
Dr. Rudy Buchheit (Committee Member)
Dr. John Beavers (Committee Member)
128 p.
Metallurgy
oxidation; steam; austenitic; 304H; 347H; shot peen; cold work; pipe; pipeline; diffusion; dislocation

Recommended Citations

Citations

  • Tossey, B. M. (2011). Steam Oxidation Resistance of Shot Peened Austenitic Stainless Steel Superheater Tubes [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1306261300

    APA Style (7th edition)

  • Tossey, Brett. Steam Oxidation Resistance of Shot Peened Austenitic Stainless Steel Superheater Tubes. 2011. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1306261300.

    MLA Style (8th edition)

  • Tossey, Brett. "Steam Oxidation Resistance of Shot Peened Austenitic Stainless Steel Superheater Tubes." Master's thesis, Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1306261300

    Chicago Manual of Style (17th edition)

osu1306261300
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© 2011, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.