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To aid in understanding the creep behavior of CSEF steel, the project team will review the available literature pertaining both to crack growth at elevated temperature and material performance under conditions involving the combined effect of creep and fatigue. In addition, the team will validate creep-indentation testing as a means of assessing the creep behavior of CSEF steels. This technique has been used successfully in Europe to provide quantitative information on the creep behavior of the CSEF steels, which was then used in analyses to more accurately estimate component life. Trials conducted to date by EPRI have demonstrated excellent correspondence between the strain rates measured using the creep-indentation test and the material condition (i.e., hardness, creep strength and microstructure).
Upon completion of all phases of the study, expected by the end of 2011, the project team will publish a “User’s Handbook” for CSEF steels, which will provide the necessary information to successfully control all major aspects of the fabrication, erection, use
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Energy-Tech will continue to follow this study - look for updates in future issues.
Kent Coleman manages EPRI’s Boiler Life and Availability Improvement Program. He has been a member of EPRI’s Generation staff for 10 years, after a 17-year utility background, and has an extensive background in the materials, life assessment and welding areas. He also holds several patents in the areas of boiler materials, welding and repair. Coleman is a member of several ASME Code committees, including SCI, Power Boilers. You may contact him by e-mailing editorial@woodwardbizmedia.com.
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