Development efforts are underway to qualify boiler and turbine materials for the ultra-supercritical (USC) steam conditions of 720/760°C and 31/35 MPa. An evaluation of the creep-rupture and stress relaxation data was performed for the critical turbine components of casing and bolting. The casing materials were Inconel 740, Udimet 500, and CCA617. Time-temperature parametric analysis of the rupture data was performed to determine the average rupture stress for a life of 100,000 hours at temperatures from 700 to 760°C. A multiple heat analysis was used for Inconel 740, and the average stress varied from 88 MPa to 109 MPa at 760°C. For Udimet 500, data for both cast and forged materials were used, and the average rupture stress was approximately the same, greater than 150 MPa at 760°C. The maximum useful temperature for CCA617 is about 730°C based on a 100 MPa/105 hours criterion. The bolting materials were Nimonic 105 and Udimet 500. For Nimonic 105, the initial strain was 0.15% and the calculated relaxed stress at 760°C was 32 MPa (using the Larson Miller parameter). For Udimet 500, the initial strains were 0.2% and 0.3%. The calculated time to a relaxed stress of 47 MPa depended on the time-temperature parameter used, and ranged from 50,000 to 100,000 hours at 760°C for an initial strain of 0.3%.
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ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference
July 23–27, 2006
Vancouver, BC, Canada
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
0-7918-4754-3
PROCEEDINGS PAPER
Analysis of Creep and Stress Relaxation Data for Ultra-Supercritical Steam Turbine Materials
Fred V. Ellis,
Fred V. Ellis
Tordonato Energy Consultants, Inc., Chattanooga, TN
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Philip J. Maziasz,
Philip J. Maziasz
Oak Ridge National Laboratory, Oak Ridge, TN
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Ian G. Wright,
Ian G. Wright
Oak Ridge National Laboratory, Oak Ridge, TN
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John P. Shingledecker
John P. Shingledecker
Oak Ridge National Laboratory, Oak Ridge, TN
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Fred V. Ellis
Tordonato Energy Consultants, Inc., Chattanooga, TN
Philip J. Maziasz
Oak Ridge National Laboratory, Oak Ridge, TN
Ian G. Wright
Oak Ridge National Laboratory, Oak Ridge, TN
John P. Shingledecker
Oak Ridge National Laboratory, Oak Ridge, TN
Paper No:
PVP2006-ICPVT-11-93110, pp. 407-416; 10 pages
Published Online:
July 23, 2008
Citation
Ellis, FV, Maziasz, PJ, Wright, IG, & Shingledecker, JP. "Analysis of Creep and Stress Relaxation Data for Ultra-Supercritical Steam Turbine Materials." Proceedings of the ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference. Volume 3: Design and Analysis. Vancouver, BC, Canada. July 23–27, 2006. pp. 407-416. ASME. https://doi.org/10.1115/PVP2006-ICPVT-11-93110
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