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Title: The Effect of Shot Peening on Steam Oxidation of 304H Stainless Steel

Abstract

Shot peening is currently utilized in coal-fired power plant components to mitigate scale exfoliation issues from steamside oxidation of austenitic stainless steel superheater and reheater tubing. To focus on commercially available material, this study exposed quarter-ring specimens cut from two different commercially shot peened type 304H tubes and exposed to 1 bar steam for up to 15,000 h at 550°, 600°, 625°, and 650 °C. Specimens were removed at increments to characterize the oxide thickness and microstructure. The shot peened inner surface generally retained a thin, protective Cr-rich scale with occasional Fe-rich oxide nodules at 550–625 °C. The increased oxidation resistance from shot peening began to degrade at 650 °C after as little as 5,000 h. Cut and polished faces of these specimens formed thick, Fe-rich oxides similar to polished 304H coupons. Surprisingly, the mechanically machined outer surface of the tube specimens performed similarly to the shot peened inner diameter, suggesting it had sufficient cold work to achieve a similar benefit. As a result, electron backscatter diffraction and Vickers-hardness measurements were used to characterize post-exposure changes in underlying microstructure and mechanical properties, respectively, imparted by shot peening.

Authors:
ORCiD logo [1]; ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Fossil Energy (FE)
OSTI Identifier:
1606998
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Oxidation of Metals
Additional Journal Information:
Journal Volume: 93; Journal Issue: 1-2; Journal ID: ISSN 0030-770X
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; stainless steel; shot peening; cold work; steam oxidation; oxide spallation

Citation Formats

Kurley, J. Matthew, and Pint, Bruce A. The Effect of Shot Peening on Steam Oxidation of 304H Stainless Steel. United States: N. p., 2019. Web. https://doi.org/10.1007/s11085-019-09951-9.
Kurley, J. Matthew, & Pint, Bruce A. The Effect of Shot Peening on Steam Oxidation of 304H Stainless Steel. United States. https://doi.org/10.1007/s11085-019-09951-9
Kurley, J. Matthew, and Pint, Bruce A. Fri . "The Effect of Shot Peening on Steam Oxidation of 304H Stainless Steel". United States. https://doi.org/10.1007/s11085-019-09951-9. https://www.osti.gov/servlets/purl/1606998.
@article{osti_1606998,
title = {The Effect of Shot Peening on Steam Oxidation of 304H Stainless Steel},
author = {Kurley, J. Matthew and Pint, Bruce A.},
abstractNote = {Shot peening is currently utilized in coal-fired power plant components to mitigate scale exfoliation issues from steamside oxidation of austenitic stainless steel superheater and reheater tubing. To focus on commercially available material, this study exposed quarter-ring specimens cut from two different commercially shot peened type 304H tubes and exposed to 1 bar steam for up to 15,000 h at 550°, 600°, 625°, and 650 °C. Specimens were removed at increments to characterize the oxide thickness and microstructure. The shot peened inner surface generally retained a thin, protective Cr-rich scale with occasional Fe-rich oxide nodules at 550–625 °C. The increased oxidation resistance from shot peening began to degrade at 650 °C after as little as 5,000 h. Cut and polished faces of these specimens formed thick, Fe-rich oxides similar to polished 304H coupons. Surprisingly, the mechanically machined outer surface of the tube specimens performed similarly to the shot peened inner diameter, suggesting it had sufficient cold work to achieve a similar benefit. As a result, electron backscatter diffraction and Vickers-hardness measurements were used to characterize post-exposure changes in underlying microstructure and mechanical properties, respectively, imparted by shot peening.},
doi = {10.1007/s11085-019-09951-9},
journal = {Oxidation of Metals},
number = 1-2,
volume = 93,
place = {United States},
year = {2019},
month = {12}
}

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