Creep Properties Assessment of P92 Steel by Small Punch Creep Tests

Deshmukh, G.S.; Prasad, M. L. V.; Peshwe, D. R.; Kumar, J. Ganesh; Mathew, M.D.; Amarendra, G.

doi:10.1007/s12666-015-0579-8

Cited by 11 publications

(6 citation statements)

References 30 publications

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“…3,4 Successful use of a small specimen testing yet warrants a method of data conversion as the data from a small specimen test are different from those of a standard one. 13 If the testing stress in a certain small specimen is somewhere around the transition point of 2 stress regimes, can the creep properties such as creep strain rate derived from small specimens with complex stress distributions be meaningful? Typically, the conversion of data is achieved through empirical equations or through iterations via finite element method, 5-8 both of which are based on the theory of continuum mechanics.…”

Section: Introductionmentioning

confidence: 99%

“…Although there were some researches demonstrating stress regime-dependent creep behaviour based on small punch creep tests, the measurement errors were unfortunately not known. 13 If the testing stress in a certain small specimen is somewhere around the transition point of 2 stress regimes, can the creep properties such as creep strain rate derived from small specimens with complex stress distributions be meaningful? This was, however, not fully considered yet in the previous studies.…”

Section: Introductionmentioning

confidence: 99%

“…However, previous studies on measurement error in data correlation between small and standard specimen testing merely aim at materials with a single stress regime. Although there were some researches demonstrating stress regime‐dependent creep behaviour based on small punch creep tests, the measurement errors were unfortunately not known . If the testing stress in a certain small specimen is somewhere around the transition point of 2 stress regimes, can the creep properties such as creep strain rate derived from small specimens with complex stress distributions be meaningful?…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of stress regime‐dependent creep behaviour on measurement of creep strain rate based on small specimen techniques

Zhang

Bai

et al. 2018

Fatigue Fract Eng Mat Struct

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Small specimen creep testing technique has become a hot topic of research as bulk materials are not available in many occasions. The stress distributions in the small specimens such as small punch and 3‐point bending specimens are essentially nonuniform. As it is known, the creep deformation/damage accumulation mechanisms exhibited at a high stress regime are not the same as the ones at a lower stress regime for many engineering alloys. The potential measurement errors because of stress regime‐dependent creep behaviour, however, has not been considered in the determination of the creep parameters based on small specimen testing in the previous studies. In this paper, 2 kinds of materials that show different Norton's parameters at the corresponding stress regimes are examined. A simple case of 2‐bar structure is firstly adopted to illustrate the measurement error of creep strain rate because of stress regime‐dependent creep behaviour. Furthermore, clamped beam bending testing and small punch testing are investigated to demonstrate the significance of measurement error using the same materials. It is shown that an error of more than 8 times may occur near the transition point of creep deformation mechanism depending on specimen types and materials. Attention should thus be paid to the selection of stress level in the small specimen testing to avoid significant measurement errors.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of stress regime‐dependent creep behaviour on measurement of creep strain rate based on small specimen techniques

Zhang

Bai

et al. 2018

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

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“…[29][30][31] Contrary to the uniaxial creep tension specimens, small specimens under creep conditions may exhibit complex mechanical responses, for example, SPT, thereby leading to nonuniform stress and strain fields in the specimen. 17,32,33 Accordingly, even though a constant external force is applied, different regions of the small specimen are likely to sustain simultaneously different creep deformation mechanisms due to the stress regimedependent creep behavior. In view of this, the stress regime-dependent creep behavior of materials may greatly influence the evaluation of creep properties based on SSTT.…”

Section: Introductionmentioning

confidence: 99%

Influence of constitutive equation and friction on measurement of creep strain rate based on small specimen testing technique

Tan,

Chang,

Zhang

et al. 2024

Fatigue Fract Eng Mat Struct

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Two stress regime‐dependent creep constitutive equations, that is, two‐regime Norton (2RN) model and Sin‐hyperbolic (Sinh) model, are adopted to numerically investigate the influence of constitutive equation and friction on the measurement of steady‐state creep strain rate based on five types small specimens. Results show that the influence of constitutive equation and friction depends strongly on the type of small specimen. A measurement error of more than 19 times may occur if the 2RN model is used, while the use of the Sinh model is able to generate a consistently lower measurement error. Of all small specimens, the cantilever beam testing (CaBT) is revealed to exhibit the best comprehensive performance in terms of measurement error and response to friction. To validate numerical findings, creep tests on the CaBT specimen of P91 steel are conducted at 600°C. Finally, recommendations on the choice of small specimen for obtaining creep strain rate are made.

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“…time to rupture or minimum creep rate. It has been employed satisfactorily to evaluate the creep strength of new alloys and welded joints in several works [29][30][31][32][33]. Furthermore, many works have been focused on extrapolating the creep results obtained by means of SPCT to conventional uniaxial creep tests and have highlighted the reliability of this miniaturized specimen testing technique to predict creep strength [34,35].…”

Section: Introductionmentioning

confidence: 99%

Design and high temperature behavior of novel heat resistant steels strengthened by high density of stable nanoprecipitates

Vivas

De-Castro

Altstadt

et al. 2020

Materials Science and Engineering: A

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International efforts have been focused on the development of new 9CrFerritic/Martensitic steels capable of operating at temperatures above 700 ºC to improve thermal efficiency of new power plants. The distribution and size of the MX nanoprecipitates present in these steels have been reported to be the key factor for improving the thermal stability of the microstructure during creep. Bearing in mind these findings, three different heat resistant steels were designed to have a higher number density of MX nanoprecipitates than commercial 9Cr ferritic/martensitic steels. The manufacturing and subsequent microstructural characterization carried out showed that this goal was achieved. Preliminary high temperature strength results performed by means of Small Punch Creep Tests (SPCT) demonstrated that these new steels improve significantly the high temperature strength without an important loss of ductility as compared to a current commercial 9Cr Ferritic/Martensitic steel.

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Creep Properties Assessment of P92 Steel by Small Punch Creep Tests

Cited by 11 publications

References 30 publications

Effect of stress regime‐dependent creep behaviour on measurement of creep strain rate based on small specimen techniques

Effect of stress regime‐dependent creep behaviour on measurement of creep strain rate based on small specimen techniques

Influence of constitutive equation and friction on measurement of creep strain rate based on small specimen testing technique

Design and high temperature behavior of novel heat resistant steels strengthened by high density of stable nanoprecipitates

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