Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7175088 | International Journal of Pressure Vessels and Piping | 2018 | 32 Pages |
Abstract
Larson-Miller (LM) and Orr-Sherby-Dorn (OSD) parameters are widely used when formulating and predicting creep rupture life tr. The LM constant C and the activation energy Q in the OSD parameter characterize temperature dependence of tr. QÂ =Â QLSD (QLSD: activation energy for lattice self-diffusion) and CÂ =Â 20 are often assumed in the formulation. Creep rupture datasets of 11 heats of nickel alloy A617, 304H and 304J1 stainless steels, 6 heats of A3004N aluminum alloy and four Mg-Al alloys are formulated with the parameters for determining C and Q of each dataset. Based on the correlation between C and Q among similar materials, it is discussed what is the C value equivalent to QÂ =Â QLSD. It is also examined how the C value changes with melting temperature of the material. The value of C equivalent to QÂ =Â QLSD varies from 14 to 9.5 depending on average values of log(rupture life) and of reciprocal temperature of the dataset. These values of C point out that CÂ =Â 20 is not equivalent to QÂ =Â QLSD. The equivalent C values are similar in all the materials independently of their melting temperatures.
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Authors
K. Maruyama, F. Abe, H. Sato, J. Shimojo, N. Sekido, K. Yoshimi,