Assessment of remaining life of fossil power plant parts by means of a miniature creep rupture test.

Kadoya, Y.; Goto, Toru; Date, Shingo; Yamauchi, T.; Saida, Tomikane; Sada, T

doi:10.2355/isijinternational.30.854

Cited by 12 publications

(7 citation statements)

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“…Among the class of candidate materials preferred for such applications, 9-12% chromium (Cr) martensitic/ferritic steels are one of the primary choices of interest due to their excellent mechanical properties under such loading conditions (Hald, 2008;Klueh, 2005;Yoshizawa and Igarashi, 2007). Due to continuous optimization of their microstructure by metallurgical alloying over the last five decades, 9-12% Cr steels currently possess much improved structural properties that have helped USC power plants to reduce their specific carbon dioxide 0749-6419/$ -see front matter Published by Elsevier Ltd. http://dx.doi.org/10.1016/j.ijplas.2013.01.008 (CO 2 ) emissions by $30% (Armor and Viswanathan, 2005;Cerjak et al, 1999;Kadoya et al, 1990). Modified 9% Cr-1% molybdenum (Mo) -designated as grade P91 by the American Society for Testing and Materials (ASTM) -belongs to this class of advanced steels and is chosen extensively for elevated temperature components (Cohn et al, 2005;Kunz and Lukas, 2002;Sikka et al, 1983).…”

Section: Introductionmentioning

confidence: 97%

WITHDRAWN: Dislocation-based constitutive modeling of martensitic/ferritic steels at elevated temperatures. Part II: Cyclic behavior without hold time effects

Kalyanasundaram

Saxena

Holdsworth

2013

International Journal of Plasticity

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Section: Introductionmentioning

confidence: 97%

WITHDRAWN: Dislocation-based constitutive modeling of martensitic/ferritic steels at elevated temperatures. Part II: Cyclic behavior without hold time effects

Kalyanasundaram

Saxena

Holdsworth

2013

International Journal of Plasticity

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“…Due to the elevated temperatures and stresses during testing, samples may require the use of an inert atmosphere within the test furnace, because oxidation effects are substantial on small specimens. Comparing the data with that in air it has shown that in an argon-rich environment the creep curves compare more favourably with those of conventional full size uniaxial specimens [9].…”

Section: Conventional Sub-size Creep Testmentioning

confidence: 72%

“…This is a tool that is used to relate the different geometries of all the individual non-standard small specimen tests to that of the full-size uniaxial test specimen. The gauge length 'l' used in conventional uniaxial creep tests and the sub-size uniaxial creep test constitutes the creep deformation as a fraction of the working gauge length, equation (9). The equivalent gauge length 'l e 'is a quantity that is derived from the geometry of the specimen in order to create an expression that models the creep strain in the unconventionally shaped small specimen tests to the conventionally shaped specimen…”

Section: Equivalent Gauge Lengthmentioning

confidence: 99%

Use of small specimen creep data in component life management: A review

Dyson

Sun

Hyde

et al. 2016

Materials Science and Technology

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Small specimen creep testing techniques are novel mechanical test techniques that have been developed over the past 25 years. They mainly include the sub-size uniaxial test, the small punch creep test, the impression creep test, the small ring creep test and the two bar creep test. This paper outlines the current methods in practice for data interpretation as well as the state of the art procedures for conducting the tests. Case studies for the use of impression creep testing and material strength ranking of creep resistant steels is reviewed along with the requirement for the standardization of the impression creep test method. A database of small specimen creep testing is required to prove the validity of the tests.

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“…A further refinement to the technique consists of using miniature specimens to minimize sample requirements. It has been demonstrated that miniature specimens (10 mm long, 3 mm diameter) tested in argon yield results representative of large specimens tested in air (Askins & Marchant 1988;Kadoya et al 1990).…”

Section: Creep Testsmentioning

confidence: 99%

Life-assessment technology for fossil power plants

Viswanathan

1995

Sadhana

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During the last decade, construction of new fossil power plants has come to a virtual halt in the United States. The main factors responsible for this situation are: (1) industry perception of the existence of sufficient reserve margins, (2) uncertainty in forecasting load growth, (3) cost of borrowing for new plant construction, (4) siting and licensing problems for new plants, and (5) the applicability of more stringent environmental standards for new plants. Unfortunately, by the year 2000 it is estimated that nearly 20% of all the fossil units will be more than 40 years old, and almost 44% will be more than 30 years old. Based on historical trends, nearly half of all fossil plants have been retired before their fortieth year and three quarters before serving 50 years. In the future this trend is unlikely because of the shrinking reserve margins and the long lead time for new capacity addition. If the life of these aging plants can be extended by 20-30 years, utilities can have a viable low-cost alternative to building new plants while at the same time circumventing some of the regulatory, siting and licensing constraints. In view of this, plant life extension has become an integral part of the planning strategy for many US utilities. A critical component of the Electric Power Research Institute's (EPRI) efforts in formulating life extension strategies for fossil power plants is the development of techniques to assess the current condition of high-temperature components. These techniques are necessary not only for assessment of the remaining life, but also for avoiding catastrophic failures and forced outages, for setting up inspection intervals and for optimizing the operating procedures. The components that are being addressed at present are boiler pressure parts, steam pipes and steam turbine rotors. This paper will provide a brief overview of current concerns and areas of research where significant progress has been made to address these concerns from a phenomenological point of view.

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Assessment of remaining life of fossil power plant parts by means of a miniature creep rupture test.

Abstract: In order to validate a procedure for creep rupture tests using miniature specimens, a sampling technique and a method of making the miniature specimens were investigated.

Cited by 12 publications

References 0 publications

WITHDRAWN: Dislocation-based constitutive modeling of martensitic/ferritic steels at elevated temperatures. Part II: Cyclic behavior without hold time effects

WITHDRAWN: Dislocation-based constitutive modeling of martensitic/ferritic steels at elevated temperatures. Part II: Cyclic behavior without hold time effects

Use of small specimen creep data in component life management: A review

Life-assessment technology for fossil power plants

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