Creep behaviour of modified 9Cr–1Mo ferritic steel

Choudhary, B.K.; Samuel, E. Isaac

doi:10.1016/j.jnucmat.2011.02.024

Cited by 115 publications

(52 citation statements)

References 29 publications

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“…It can be seen that these values are much higher and do not reflect the true value of the activation energy. Higher apparent creep activation energies for different high strength Cr-Mo steels have also been reported by different studies [39,40].…”

Section: Creep Behaviour Analysissupporting

confidence: 69%

Investigation of short-term creep deformation mechanisms in MarBN steel at elevated temperatures

Benaarbia

Sun

et al. 2018

Materials Science and Engineering: A

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This paper reports the short-term creep behaviour at elevated temperatures of a MarBN steel variant. Creep tests were performed at three different temperatures (625°C, 650°C and 675°C) with applied stresses ranging from 160 MPa to 300 MPa, and failure times from 1 to 350 h. Analysis of the macroscopic creep data indicates that the steady-state creep exhibits a power-law stress dependence with an exponent of 7 and an activation energy of 307 kJ mol, suggesting that dislocation climb is the dominant rate-controlling creep mechanism for MarBN steel. Macroscopic plastic instability has also been observed, highlighted by an obvious necking at the rupture region. All the macroscopic predictions have been combined with microstructural data, inferred from an examination of creep ruptured samples, to build up relations between macroscopic features (necking, damage, etc.), and underlying microstructural mechanisms. Analysis of the rupture surfaces has revealed a ductile fracture mode. Electron Backscatter Diffraction (EBSD) analysis near to the rupture surface has indicated significant distortion and refinement of the original martensitic substructure, which is evidence of long-range plastic flow. Dislocation pile-ups and tangles from TEM were also observed near substructure boundaries and precipitate particles. All of these microstructural observations suggest that creep is influenced by a complex interaction between several elements of the microstructure, such as dislocations, precipitates and structure boundaries. The calculated stress exponent and activation energy have been found to agree quantitatively with the highlighted microstructural features, bearing some relationships to the true observed creep microstructures.

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Section: Creep Behaviour Analysissupporting

confidence: 69%

Investigation of short-term creep deformation mechanisms in MarBN steel at elevated temperatures

Benaarbia

Sun

et al. 2018

Materials Science and Engineering: A

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“…The creep strain in the tertiary creep stage accumulated more rapidly than in the primary and steady-state creep stages, which is a result of necking prior to fracture. The stress dependence of minimum creep rate m  obeyed Norton's power law [9]:…”

Section: Resultsmentioning

confidence: 99%

Study on creep behavior of Grade 91 steel at 838K

Ren¹,

Tang²

2017

Proceedings of the 2nd International Conference on Computer Engineering, Information Science &Amp; Application Technology (ICCI

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“…In the second set (Set-2), the creep-rupture data consisted of 1072 data points. In addition to the data in Set-1, a significantly large amount of creep-rupture data was obtained from different sources from Japan [19][20][21], Europe [22][23][24], USA [25][26][27][28], and the Indira Gandhi Centre for Atomic Research (IGCAR), India [4]. The larger creep rupture database for Grade 91 steel was prepared by digitizing the published document data.…”

Section: Two Sets Of Creep Rupture Datamentioning

confidence: 99%

“…The steel developed by the addition of strong carbide/nitride forming elements such as V and Nb along with the controlled addition of N in the plain 9Cr-1Mo steel, offers a good combination of high creep strength and ductility over long exposures at high temperatures [1][2][3][4]. In view of its superior creep strength, Grade 91 steel has been chosen as a candidate structural material for the steam generator, intermediate heat exchangers (IHX), and primary pipes of a generation-IV (Gen-IV) sodium-cooled fast reactor (SFR).…”

Section: Introductionmentioning

confidence: 99%

Influence of data size on the reliability assessment of creep life of grade 91 steel

et al. 2014

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Influence of data size on a reliability assessment of the long-term creep life of Grade 91 steel was investigated for two different sets of large body of creep-rupture data comprising 690 (Set-1) and 1072 (Set-2) data points. The Z-parameter on the Larson-Miller parameter of creep rupture data supported a normal distribution well. Based on the normal distribution, the reliability of the predicted creep life for the two data sets was assessed to obtain variations in reliability owing to fluctuations in the service conditions and the dispersion of the creep data using a service condition-creep rupture property interference (SCRI) model. A large number of random variables for Z-parameter were generated using Monte-Carlo simulation. A reliability assessment for the two data sizes under specific service conditions has been comparatively demonstrated. It was found that the size of the creep-rupture data influenced the reliability of the creep life prediction.

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Creep behaviour of modified 9Cr–1Mo ferritic steel

Cited by 115 publications

References 29 publications

Investigation of short-term creep deformation mechanisms in MarBN steel at elevated temperatures

Investigation of short-term creep deformation mechanisms in MarBN steel at elevated temperatures

Study on creep behavior of Grade 91 steel at 838K

Influence of data size on the reliability assessment of creep life of grade 91 steel

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