Rationalization of Short-Term Creep Test Data and Prediction of Long-Term Creep Strengths of a Fe-20Cr-25Ni (Wt Pct) Austenitic Stainless Steel (Alloy 709)

Determination of Activation Energy and Prediction of Long-Term Strength of Creep Rupture for Alloy Inconel 740/740H: A Method Based on a New Tensile Creep Rupture Model

“…These results differ fundamentally from those of the conventional creep rupture model described previously. Nevertheless, they are consistent with those obtained by the new creep rupture model for other types of creep-resistant alloys such as martensitic [5,8,9,[13][14][15][16] and austenitic [12] creep-resistant steels and Ni-base superalloys. [8,14] The results in Figure 4 also suggest that stress and temperature have equivalent effects on creep lifetime, i.e., varying stress has the same effect as varying temperature on creep lifetime.…”

A new tensile creep model for predicting long-term creep strengths with short-term test data for creep resistant alloys

“…The above model can meet the two limiting conditions of tensile creep, i.e. (a) when σ → 0, ṁin → 0 (no creep), and (b) when σ → σ TS , ṁin → rupture occurs immediately) It has been shown that Equation (4) can be used to rationalise creep behaviour of different types of creep resistant alloys including 9-12Cr martensitic steels [8][9][10][11][12][13][14][15], austenitic steels [16] and different grades of Ni-based superalloys [8,12,17]. For all these alloys, when the creep data are analysed based on Equation ( 4), the stress exponant n is not a function of temperature and the activation energy Q c is independent of stress.…”

“…For all these alloys, when the creep data are analysed based on Equation ( 4), the stress exponant n is not a function of temperature and the activation energy Q c is independent of stress. As a consequence, the model constants in Equation ( 4), once obtained from the short-term creep test data, can be used to make the long-term creep strength predictions at different temperatures [8][9][10][11][12][13][14][15][16][17].…”

Design of a novel creep testing machine to investigate the creep life history of austenitic steel foil at elevated temperature

“…Finally, the theta projection model can be applied to produce a reliable estimation of the rupture life of a material subjected to creep. 31,32 Although several studies used existing models for predicting the creep life in the case of austenitic stainless steels, 7,14,33,34 there still seems to be a lack of a detailed investigation in the case of modeling the creep behavior of AISI 347 employing theta projection model. Moreover, it has been limited to 35 simulate the effect of oxidation on the creep life of material through a numerical study.…”