Microstructural study of creep rupture in a 12% chromium ferritic steel

Eggeler, Gunther; Earthman, James C.; Nilsvang, Nicolas; Ilschner, Bernhard

doi:10.1016/0001-6160(89)90265-4

Cited by 85 publications

(50 citation statements)

References 17 publications

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“…Many measurements were performed by Wu and Sandström (1995) for a 12% Cr steel and led to the conclusion that the nucleation kinetics is controlled only by strain. They confirmed this result in Wu and Sandström (1996) where a review of more than ten other works concerning 0.5-2.25 and 12% Cr steels is added and supports their conclusions (see also Eggeler et al, 1989b). However, creep cavity measurements were only carried out on smooth creep specimens, for which the stress state is uniaxial and uniform.…”

Section: Model For the Damaged Materialssupporting

confidence: 58%

“…In Figure 6, experimental results are well reproduced using this well known LM parameter. However, long term creep data at 650 • C from Kimura et al (2000) and at 600 • C from Eggeler et al (1989b), who carried out creep tests longer than 30,000 h, show a change in the damage mechanism for longer failure times leading to premature failure in comparison with LM predictions, as shown in Figure 6.…”

Section: Creep Fracture Propertiesmentioning

confidence: 97%

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Creep failure model of a tempered martensitic stainless steel integrating multiple deformation and damage mechanisms

2005

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International audienceA new model considering both deformation and damage evolution under multiple viscoplastic mechanisms is used to represent high temperature creep deformation and damage of a martensitic stainless steel in a wide range of load levels. First, an experimental database is built to characterise both creep flow and damage behaviour using tests on various kinds of specimens. The parameters of the model are fitted to the results and to literature data for long term creep exposure. An attempt is made to use the model to predict creep time to failure up to 105 h

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Section: Model For the Damaged Materialssupporting

confidence: 58%

Section: Creep Fracture Propertiesmentioning

confidence: 97%

Creep failure model of a tempered martensitic stainless steel integrating multiple deformation and damage mechanisms

2005

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“…The damage mechanisms were analyzed using microstructural observations and quantitative measurements of the primary graphite dimensions. This approach is closely related to previous works [12,21,22], where mechanistically-based parameters were successfully used to quantify cavitation creep damage. After tensile and compression tests, samples were longitudinally cut and polished to measure the nodule parameters: surface fraction, mean size diameter and aspect ratio.…”

Section: Mechanical Testing and Damage Analysismentioning

confidence: 77%

Damage Analysis of a Ferritic SiMo Ductile Cast Iron Submitted to Tension and Compression Loadings in Temperature

Thuault

Hug

2015

Metals

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Tensile and compression tests were carried out on a ductile cast iron for temperatures up to 1073 K. The damage caused inside and around graphite nodules was evaluated as a function of the local equivalent plastic strain by using microstructural quantifications. The mechanical properties are strongly dependent on a temperature above 773 K. Concerning tensile behavior, an evolutional law issued from the Gurson model representing the void growth as a function of the deformation and temperature was successfully employed. It is demonstrated that the strain state and the temperature have a strong influence on the void growth function. In the case of compression tests, the temperature has a weak influence on the nodule deformation for temperatures lower than 773 K, and the mechanical behavior is driven by the viscoplastic properties of the ferrite. For higher temperatures, the mechanical properties in compression are progressively modified, since graphite nodules tend to remain spherical, and ferrite grains are severely deformed. A synthesis of the damage mechanisms is proposed in the studied range of temperature and plastic strain. It appears that the graphite nodule aspect ratio can be used OPEN ACCESSMetals 2015, 5 2352 as an indicator of the deformation under compression loading for temperatures ranging from room temperature to 673 K.

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“…Longterm creep specimens fracture after the coalescence of diffusional creep cavities. These ones nucleated and grew at austenitic grain and packet/block boundaries (Eggeler et al 1989).…”

Section: Introductionmentioning

confidence: 99%

Modelling and experimental study of the tertiary creep stage of Grade 91 steel

et al. 2011

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International audienceThis article addresses experimental studies and analytical simulations of the tertiary creep stage of Grade 91 steel tested at various stresses and temperatures between 500°C (up to 160 × 103 h) and 600°C (up to 94 × 103 h). The strain rate increases after its minimum mainly because of the softening of the material which microstructure evolves strongly during creep deformation. An interrupted creep test shows that necking significantly affects the acceleration of the reduction in cross-section only during the last 10% of the creep lifetime. The Hoff model based on homogeneous reduction of cross-section correctly predicts lifetimes only for high applied stress. The Hart necking model using the Norton power-law allows fair predictions of lifetimes up to 60 × 103 h at 500°C. The necking model using a modified Norton power-law combined with a material softening term allows predictions of lifetimes for all creep tests, differing from the experimental results by less than 50%, which is consistent with the experimental scatter. The evolution of the cross-section predicted by this model is in agreement with measurements carried out during the interrupted creep test. Two prediction rules for the lifetime prediction are deduced from the necking model that takes into account the material softening. For a large number of tempered martensitic steels, these two criteria bound the experimental lifetimes up to 200 × 103 h at 500-700°C

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Microstructural study of creep rupture in a 12% chromium ferritic steel

Cited by 85 publications

References 17 publications

Creep failure model of a tempered martensitic stainless steel integrating multiple deformation and damage mechanisms

Creep failure model of a tempered martensitic stainless steel integrating multiple deformation and damage mechanisms

Damage Analysis of a Ferritic SiMo Ductile Cast Iron Submitted to Tension and Compression Loadings in Temperature

Modelling and experimental study of the tertiary creep stage of Grade 91 steel

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