The 100,000 hrs creep rupture strength of Alloy 617 at 700 °C is estimated by Larson–Miller method using the rupture data of longer duration than 500 hrs in the temperature range between 593 and 816 °C, corresponding to 700 ± 100 °C. The maximum time to rupture was 40,126.7 hrs. The rupture data exhibit large scattering, especially at 760 °C. After eliminating the shorter time to rupture data at 760 °C, the regression analysis gives us the Larson–Miller constant C = 12.70 and the 100,000 hrs creep rupture strength of 100 MPa at 700 °C, by Swindeman program. The present regression analysis underestimates the constant C and 100,000 hrs creep rupture strength. The linear extrapolation of log tr versus reciprocal temperature 1/T plots to 1/T = 0 gives us an average C value of Cav = 18.5, which is much larger than the constant C of 12.70 obtained by the Swindeman program. It is concluded that the origin of underestimation of the constant C and corresponding 100,000 hrs creep rupture strength is large data scattering. Using an appropriate constant C of 18.45, the 100,000 hrs creep rupture strength at 700 °C is estimated to be 123 MPa. Using the rupture data including the shorter time to rupture data at 760 °C and using C = 18.45, the 100,000 hrs creep rupture strength at 700 °C is estimated to be 116 MPa.
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February 2017
Research-Article
Influence of Data Scattering on Estimation of 100,000 hrs Creep Rupture Strength of Alloy 617 at 700 °C by Larson–Miller Method
Fujio Abe,
Fujio Abe
National Institute for Materials Science,
1-2-1 Sengen,
Tsukuba 305-0047, Japan
e-mail: ABE.Fujio@nims.go.jp
1-2-1 Sengen,
Tsukuba 305-0047, Japan
e-mail: ABE.Fujio@nims.go.jp
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M. Tabuchi,
M. Tabuchi
National Institute for Materials Science,
1-2-1 Sengen,
Tsukuba 305-0047, Japan
1-2-1 Sengen,
Tsukuba 305-0047, Japan
Search for other works by this author on:
M. Hayakawa
M. Hayakawa
National Institute for Materials Science,
1-2-1 Sengen,
Tsukuba 305-0047, Japan
1-2-1 Sengen,
Tsukuba 305-0047, Japan
Search for other works by this author on:
Fujio Abe
National Institute for Materials Science,
1-2-1 Sengen,
Tsukuba 305-0047, Japan
e-mail: ABE.Fujio@nims.go.jp
1-2-1 Sengen,
Tsukuba 305-0047, Japan
e-mail: ABE.Fujio@nims.go.jp
M. Tabuchi
National Institute for Materials Science,
1-2-1 Sengen,
Tsukuba 305-0047, Japan
1-2-1 Sengen,
Tsukuba 305-0047, Japan
M. Hayakawa
National Institute for Materials Science,
1-2-1 Sengen,
Tsukuba 305-0047, Japan
1-2-1 Sengen,
Tsukuba 305-0047, Japan
Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received November 13, 2015; final manuscript received March 28, 2016; published online August 5, 2016. Assoc. Editor: Haofeng Chen.
J. Pressure Vessel Technol. Feb 2017, 139(1): 011403 (9 pages)
Published Online: August 5, 2016
Article history
Received:
November 13, 2015
Revised:
March 28, 2016
Citation
Abe, F., Tabuchi, M., and Hayakawa, M. (August 5, 2016). "Influence of Data Scattering on Estimation of 100,000 hrs Creep Rupture Strength of Alloy 617 at 700 °C by Larson–Miller Method." ASME. J. Pressure Vessel Technol. February 2017; 139(1): 011403. https://doi.org/10.1115/1.4033290
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