The role of Laves phase on microstructure evolution and creep strength of novel 9%Cr heat resistant steels

Prat, O.; García, J.; Rojas, D.; Sauthoff, Gerhard; Inden, Gerhard

doi:10.1016/j.intermet.2012.08.016

Cited by 110 publications

(60 citation statements)

References 42 publications

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“…As observed, there is a change of the Cr signal in the Laves phase composition from the EDX-TEM analysis, which is similar to the observation in the references [18][19] . This has a consequence on depletion of Cr but also on change of the W content in the matrix of the steel.…”

Section: Discussion On the Laves Composition And Morphologysupporting

confidence: 88%

“…The effect of elements on kinetics, composition and morphology of the Laves phase was included in previous studies [18][19][20] .…”

Section: Discussion On the Laves Composition And Morphologymentioning

confidence: 99%

“…Previous research [18][19][20] also provides some basis for the effect of heat treatment on morphology, in particular if we are dealing with newly nucleated Laves phase or re-transformed Laves phase on grain boundaries. From the microstructure observation in the present work, it appears inconceivable for the Laves phase after reheating to be all newly nucleated, though a fraction of it could be re-transformed.…”

Section: Discussion On the Laves Composition And Morphologymentioning

confidence: 99%

See 2 more Smart Citations

Relationship between Laves phase and the impact brittleness of P92 steel reevaluated

Zhong

Wang

et al. 2015

Materials Science and Engineering: A

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Section: Discussion On the Laves Composition And Morphologysupporting

confidence: 88%

“…The effect of elements on kinetics, composition and morphology of the Laves phase was included in previous studies [18][19][20] .…”

Section: Discussion On the Laves Composition And Morphologymentioning

confidence: 99%

Section: Discussion On the Laves Composition And Morphologymentioning

confidence: 99%

See 1 more Smart Citation

Relationship between Laves phase and the impact brittleness of P92 steel reevaluated

Zhong

Wang

et al. 2015

Materials Science and Engineering: A

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“…Prat [13] carried out the microstructural study of 9Cr heat-resistant ferritic steels and demonstrated the validity of the multi-component phase diagram calculated by the Thermo-calc code and TC-FE database. Additionally, Tamura [14] metallurgically investigated the microstructure of thermally aged 8-12Cr heat-resistant ferritic steels and reported the temperature dependence of the precipitation behavior (M 23 C 6 , Laves) in the steels, which agrees well with that seen in Figure 3: precipitation of both the M 23 C 6 -type carbide and the Laves phase roughly at 600-700…”

Section: Resultsmentioning

confidence: 90%

Investigation of the cause of peculiar irradiation behavior of 9Cr-ODS steel in BOR-60 irradiation tests

Ohtsuka

Kaito

Yano

et al. 2013

Journal of Nuclear Science and Technology

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Four experimental fuel assemblies (EFAs) containing 9Cr-ODS steel cladding fuel pins were previously irradiated in the BOR-60 to demonstrate the in-reactor performance of 9Cr-ODS steel for use as fuel cladding tubes. One of the EFAs achieved the best data, a peak burn-up of 11.9at% and a neutron dose of 51 dpa, without any microstructure instability or any fuel pin rupture. On the other hand, in another EFA (peak burn-up, 10.5at%; peak neutron dose, 44 dpa), peculiar irradiation behaviors, such as microstructure instability and fuel pin rupture, occurred. Investigations of the cause of these peculiar irradiation behaviors were carried out. The detection sensitivity in an ultrasonic inspection test was shown to be low for the metallic Cr and metallic Fe inclusions. The peculiar microstructure change reappeared with high-temperature thermal-aging of the 9Cr-ODS steel containing metallic Cr inclusions. The strength and ductility of the defective part containing metallic Cr inclusions were appreciably lower than those of a standard part without the inclusions. The combined effects of matrix Cr heterogeneity (presence of metallic Cr inclusions) and high-temperature irradiation were concluded to be the main cause of the peculiar microstructure change in 9Cr-ODS steel cladding tubes in the BOR-60 irradiation tests. They contributed to the fuel pin rupture.

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“…The creep strength obtained with the extrapolation method based on the data of the creep deformation at a high stress is higher than the true creep strength under these conditions (at low stresses). 1,2 The creepstrength degradation is not only based on the microstructural degradation [3][4][5][6] , but it is also related to the change in the creep mechanism. [7][8][9] The creep-mechanism clarification has to depend on the instantaneous creep behavior because the long-term creep is associated with the microstructural degradation.…”

Section: Introductionmentioning

confidence: 99%

Short-term creep of P91 heat-resistant steels at low stresses and an instantaneous-stress-change testing

Zhe¹,

Junjie²,

Pengshuo³

2017

Mater. Tehnol.

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For the short-term creep behavior to be evaluated and the creep mechanism of P91 heat-resistant steels at low stresses and high temperatures to be clarified, stress-change testing was conducted with a "helicoidal-spring creep test" demonstrating a high strain resolution. The creep deformation consists of the primary creep stage, whereas no secondary creep stage was observed. Blackburn's law was suggested to be the best choice for a short-term-creep-behavior description because it provides a good representation of an experimental creep curve. An anelastic backflow at a low stress was confirmed, following a high reduction in the stress. The absolute value of the instantaneous strain for a load increase was equal to the value for a load decrease and the creep of the P91 steels at low stresses might have been controlled by the viscous glide of dislocations. Keywords: P91 heat-resistant steel, creep, anelastic, stress change Da bi bilo mo~oceniti kratkotrajno lezenje in njegov mehanizem toplotno obstojnega jekla P91 pri nizkih napetostih in visokih temperaturah, so bili izvedeni preizkusi spremembe napetosti z uporabo t.i. testa spiralne vzmeti, ki omogo~a veliko lo~ljivost deformacije. Deformacija lezenja sestoji iz primarne in sekundarne faze lezenja, vendar sekundarne faze niso analizirali oz. opazovali. Blackburnov zakon je najbolj uporaben zakon za opis obna{anja jekla med kratkotrajnim lezenjem, ker se z njim najbolj pribli`amo rezultatom, dobljenim z eksperimenti. Neelasti~ni povratni tok pri nizki napetosti je bil potrjen z ve~jim zmanj{anjem napetosti. Zaradi absolutne vrednosti trenutne deformacije za dano obremenitev je bil narastek deformacije enak zmanj{anju obremenitve, medtem ko je lezenje pri nizkih napetostih jekla P91 kontrolirano z viskoznim drsenjem dislokacij. Klju~ne besede: P91 jeklo za delo v vro~em, lezenje, neelasti~nost, sprememba napetosti

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The role of Laves phase on microstructure evolution and creep strength of novel 9%Cr heat resistant steels

Cited by 110 publications

References 42 publications

Relationship between Laves phase and the impact brittleness of P92 steel reevaluated

Relationship between Laves phase and the impact brittleness of P92 steel reevaluated

Investigation of the cause of peculiar irradiation behavior of 9Cr-ODS steel in BOR-60 irradiation tests

Short-term creep of P91 heat-resistant steels at low stresses and an instantaneous-stress-change testing

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