Constitutive Equations Describing Creep Curve of a Statically Aged Mod.9Cr-1Mo Steel

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  • 静的時効させた改良9Cr-1Mo鋼のクリープ曲線を記述する構成方程式
  • セイテキ ジコウ サセタ カイリョウ 9Cr-1Mo コウ ノ クリープ キョクセン オ キジュツ スル コウセイ ホウテイシキ

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Abstract

Creep behavior of a Mod.9Cr-1Mo steel statically aged under various conditions has been analyzed using the Omega method. The aging temperature and time are between 873 and 948 K, and between 100 and 10000 h, respectively. Tertiary creep was expressed by the following equation;<BR>(This article is not displayable. Please see full text pdf.) <BR>\oindentwhere \dotε0 is the imaginary initial creep rate and Ω is the strain rate acceleration factor. The imaginary initial creep rate was expressed as a function of aging time, ta and aging temperature, Ta as follows;<BR>(This article is not displayable. Please see full text pdf.) <BR>\oindentwhere the values of Aa, nta, Q0a, na and Qa are 1.02×103 s−1, 0.19, 52 kJ/mol, 13.0 and 623 kJ/mol in this order.<BR>Behavior of primary creep was approximated by a logarithmic creep equation containing two parameters, which were correlated with the imaginary initial creep rate. Consequently, creep life was estimated from a knowledge of imaginary initial creep rate. It was found that the calculated creep life from the modified Omega method in which primary creep was taken into account, agreed well with the measured one.

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