TY - JOUR
T1 - On the physical basis of a Larson-Miller constant of 20
AU - Maruyama, K.
AU - Abe, F.
AU - Sato, H.
AU - Shimojo, J.
AU - Sekido, N.
AU - Yoshimi, K.
N1 - Funding Information:
The present study was supported by an ALCA project (grant No. 411 ) and a JSPS Grant-in-Aid for Scientific Research (C) (grant No. 15K06499 ). Financial supports from Japan Science and Technology Agency and Japan Society for the Promotion of Science are acknowledged. The authors thank also The Light Metal Educational Foundation, Inc., Japan for financial support (grant No. 2016-3 ).
Funding Information:
The present study was supported by an ALCA project (grant No. 411) and a JSPS Grant-in-Aid for Scientific Research (C) (grant No. 15K06499). Financial supports from Japan Science and Technology Agency and Japan Society for the Promotion of Science are acknowledged. The authors thank also The Light Metal Educational Foundation, Inc., Japan for financial support (grant No. 2016-3).
Publisher Copyright:
© 2017 Elsevier Ltd
PY - 2018/1
Y1 - 2018/1
N2 - 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. Q = QLSD (QLSD: activation energy for lattice self-diffusion) and C = 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 Q = QLSD. It is also examined how the C value changes with melting temperature of the material. The value of C equivalent to Q = 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 C = 20 is not equivalent to Q = QLSD. The equivalent C values are similar in all the materials independently of their melting temperatures.
AB - 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. Q = QLSD (QLSD: activation energy for lattice self-diffusion) and C = 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 Q = QLSD. It is also examined how the C value changes with melting temperature of the material. The value of C equivalent to Q = 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 C = 20 is not equivalent to Q = QLSD. The equivalent C values are similar in all the materials independently of their melting temperatures.
KW - Aging
KW - Creep fracture
KW - Creep life prediction
KW - Modelling of creep rupture life
KW - Time-temperature parameter analysis
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U2 - 10.1016/j.ijpvp.2017.11.013
DO - 10.1016/j.ijpvp.2017.11.013
M3 - Article
AN - SCOPUS:85036478602
SN - 0308-0161
VL - 159
SP - 93
EP - 100
JO - International Journal of Pressure Vessels and Piping
JF - International Journal of Pressure Vessels and Piping
ER -