Creep characterization of a Ni-based Hastelloy-X alloy by using theta projection method

Kim, Woo‐Gon; Yin, Song-Nan; Chang, Jonghwa

doi:10.1016/j.engfracmech.2008.06.017

Cited by 47 publications

(24 citation statements)

References 12 publications

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“…Creep property prediction of the high chromium ferritic steel: Hui Liu and Hua-Tang Yao model the decelerating primary and the accelerating tertiary stages of creep, not only interpolating but also extrapolating creep data [14]. Many experiments confirmed that Theta projection method is an important and reliable method for extrapolating short-term test results to long-term creep data needed for the design of components [4,[14][15][16].…”

Section: (A) (B)mentioning

confidence: 99%

Creep property prediction of the high chromium ferritic steel 1Cr10NiMoW2VNbN at 600°C

Liu

Yao²

2013

Materials at High Temperatures

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High chromium (Cr) ferritic steel 1Cr10NiMoW2VNbN was the first material developed in China for ultra-supercritical power stations. The creep property of high Cr ferritic steel 1Cr10NiMoW2VNbN has been studied under constant loading conditions at 600°C. The Theta projection concept applied to the creep curves was found to yield accurate predictions when interpolating and predicting creep data under service conditions. Four Theta parameters were obtained by Theta projection concept from the creep curves. The shape of the creep curves, as well as the minimum creep rate, the time to reach a limiting strain, and the time to rupture were considered with a wide range of stresses at 600°C of the high Cr ferritic steel.

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Section: (A) (B)mentioning

confidence: 99%

Creep property prediction of the high chromium ferritic steel 1Cr10NiMoW2VNbN at 600°C

Liu

Yao²

2013

Materials at High Temperatures

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“…The subscript "bc" represents the bond coat, and "s" substrate. Those stresses could lead to the creep deformation in both bond coat and substrate [16][17][18].…”

Section: Methodsmentioning

confidence: 99%

“…To ensure reliability of the results, a 50× optical lens was employed and 50 measurements were performed for each sample. 16 …”

mentioning

confidence: 99%

High temperature stress and its influence on surface rumpling in NiCoCrAlY bond coat

et al. 2017

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The objective of this work is to develop a methodology to measure the high temperature stress in the bond coat, and investigate its role on the surface rumpling. We first presented an analytical model to evaluate the high temperature stress using X-ray sin 2 Ψ technique coupling with the curvature measurement at room temperature. A typical NiCoCrAlY bond coat with a Hastelloy-X substrate was employed as a model sample. During exposure at 1150 ºC , the bond coat was under tension at high temperature, increasing parabolically from 1.05 MPa after 12 h to 3.81 MPa after 120 h. To understand its effect on the surface rumpling, the bond coat surface roughness was recorded as a function of time, and compared with a bulk NiCoCrAlY alloy. A strong correlation between the bond coat stress and the surface roughness was identified. In addition, the origination of the bond coat stress and the rumpling mechanism were discussed. 2It was revealed that the high temperature stress in the bond coat was caused by the volume shrinkage from β-γ transformation, mainly due to the inter-diffusion. The grain sliding accompanied with diffusional creep in response to the bond coat stress controls the roughening.

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“…Recently, it has been proposed that these conventional approaches to creep should be replaced by procedures offering constitutive ..ÏÏ equations which accurately describe the shape of the entire creep curve and which quantify the changes in creep curve shape resulting from changes in test conditions [5][6][7][8]. Among these equations, the ö-projection method has been widely used for characterizing the creep properties of some materials commonly used in hightemperature applications [3,[8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…Over the past decades, various equations have been suggested by many researchers for describing the creep curves [4][5][6][7]. Recently, it has been proposed that these conventional approaches to creep should be replaced by procedures offering constitutive ..ÏÏ equations which accurately describe the shape of the entire creep curve and which quantify the changes in creep curve shape resulting from changes in test conditions [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Creep Characterization of Ni-Based Superalloy IN-792 Using the 4- and 6-θ Projection Method

Sajjadi¹,

Berahmand²,

Rezaee-Bazzaz

2013

Journal of Engineering Materials and Technology

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This paper studies the accuracy of a technique which is capable of predicting and modeling a wide range of creep life in Ni-based superalloys. The 9-projection method was applied to characterize the creep behavior of the Ni-based superalloy IN-792 at 800 °C. Constant load creep tests have been carried out over a wide range of loads at the constant operating temperature. Creep curves were fitted using either 4-6 or 6-9 equation by the use of a nonlinear ¡east-square technique. The results showed that both 4-and 6-0 projection parameters revealed a good linearity as a function of stress. Comparison of experimental creep curves with those predicted using both of the utilized 6-projection techniques showed that the techniques fit the experimental data at high strain values very well while the 6-9 approach describes much better the creep curves at low strain region.

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Creep characterization of a Ni-based Hastelloy-X alloy by using theta projection method

Cited by 47 publications

References 12 publications

Creep property prediction of the high chromium ferritic steel 1Cr10NiMoW2VNbN at 600°C

Creep property prediction of the high chromium ferritic steel 1Cr10NiMoW2VNbN at 600°C

High temperature stress and its influence on surface rumpling in NiCoCrAlY bond coat

Creep Characterization of Ni-Based Superalloy IN-792 Using the 4- and 6-θ Projection Method

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