On the physical basis of a Larson-Miller constant of 20

K. Maruyama, F. Abe, H. Sato, J. Shimojo, N. Sekido, K. Yoshimi

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

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. 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.

Original languageEnglish
Pages (from-to)93-100
Number of pages8
JournalInternational Journal of Pressure Vessels and Piping
Volume159
DOIs
Publication statusPublished - 2018 Jan

Keywords

  • Aging
  • Creep fracture
  • Creep life prediction
  • Modelling of creep rupture life
  • Time-temperature parameter analysis

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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