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Welding Metallurgy of Nickel-Based Superalloys for Power Plant Construction

Tung, David C.
http://orcid.org/0000-0003-0946-6520
http://rave.ohiolink.edu/etdc/view?acc_num=osu1449164834

Abstract Details

2015, Doctor of Philosophy, Ohio State University, Welding Engineering.
Abstract Increasing the steam temperature and pressure in coal-fired power plants is a perpetual goal driven by the pursuit of increasing thermal cycle efficiency and reducing fuel consumption and emissions. The next target steam operating conditions, which are 760°C (1400°F) and 35 MPa (5000 psi) are known as Advanced Ultra Supercritical (AUSC), and can reduce CO2 emissions up to 13% but this cannot be achieved with traditional power plant construction materials. The use of precipitation-strengthened Nickel-based alloys (superalloys) is required for components which will experience the highest operating temperatures. The leading candidate superalloys for power plant construction are alloys 740H, 282, and 617. Superalloys have excellent elevated temperature properties due to careful microstructural design which is achieved through very specific heat treatments, often requiring solution annealing or homogenization at temperatures of 1100 °C or higher. A series of postweld heat treatments was investigated and it was found that homogenization steps before aging had no noticeable effect on weld metal microhardness, however; there were clear improvements in weld metal homogeneity. The full abstract can be viewed in the document itself.
John Lippold (Advisor)
Boian Alexandrov (Committee Member)
Antonio Ramirez (Committee Member)
214 p.
Materials Science; Metallurgy
Welding Metallurgy; Stress Relaxation Cracking; Stress Relief Cracking; 740; 282; 617; AUSC; Advanced Ultra Supercritical; PWHT; Stress Relaxation Testing; Stress Relief Testing; Compact Tension Samples; Residual Stress; Pre-Compression; Superalloy;

Recommended Citations

Citations

  • Tung, D. C. (2015). Welding Metallurgy of Nickel-Based Superalloys for Power Plant Construction [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1449164834

    APA Style (7th edition)

  • Tung, David. Welding Metallurgy of Nickel-Based Superalloys for Power Plant Construction. 2015. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1449164834.

    MLA Style (8th edition)

  • Tung, David. "Welding Metallurgy of Nickel-Based Superalloys for Power Plant Construction." Doctoral dissertation, Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1449164834

    Chicago Manual of Style (17th edition)

osu1449164834
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© 2015, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.