کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1577620 | 1514809 | 2012 | 5 صفحه PDF | دانلود رایگان |
This study addresses the overestimation of the time–temperature-parameter (TTP) method on the allowable creep strength of 9–12% Cr heat resistant steels. Creep data of 9% Cr heat resistant steels are divided into several data sets according to the creep controlling mechanism. Constitutive equations of the minimum creep rate ε˙m depending on applied stress σ and temperature T have been constructed, and the modeling results are found to be well in agreement with the experimental data. The influence of the second phase particles in the power-law-breakdown (PLB) region on 9% Cr heat resistant steels is well reflected by introducing a parameter, σ0, into the equation. Furthermore, the construction of constitutive equations of ε˙m from the PLB region to the power-law (PL) region for 9% Cr heat resistant steels has been shown to be feasible.
► Constitutive equations of the minimum creep rate have been constructed.
► Creep data are divided according to the creep controlling mechanism.
► The influence of the second phase particles is emphasized.
► The influence of the second phase particles is well reflected.
► Constitutive equations from the PLB region to the PL region should be feasible.
Journal: Materials Science and Engineering: A - Volume 534, 1 February 2012, Pages 649–653