Creep-fatigue-oxidation interactions in a 9Cr–1Mo martensitic steel. Part II: Effect of compressive holding period on fatigue lifetime

Fournier, Benjamin; Sauzay, Maxime; Caës, Christel; Noblecourt, Michel; Mottot, Michel; Bougault, Annick; Rabeau, Véronique; Pineau, A.

doi:10.1016/j.ijfatigue.2007.05.008

Cited by 82 publications

(45 citation statements)

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“…3. However, according to the previous reports [15][16][17][18][19], the fatigue life of the 9-12Cr martensitic steels obtained in vacuum was longer than that Fig. 3 Relationship between total strain range (Δε t ) and number of cycles to failure (N f ) of RB-1 specimen tested at R.T. in air [1] and tested at 550…”

Section: Resultsmentioning

confidence: 77%

“…On the other hand, based on the fact that the difference in the fatigue life of the RB-7 specimen between in air and in vacuum was not so large, which did not exceed the scatter range of a factor of 2 of the regression curve of the room temperature test shown in Fig. 3, and fact that the detrimental effect of oxidation on the fatigue life occurred under relatively low strain range conditions [18,19], it could be assumed that the effect of the oxidation on the fatigue life of the F82H-IEA was relatively small or negligible under the test condition of the present study.…”

Section: Resultsmentioning

confidence: 99%

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High Temperature Fatigue Life Evaluation Using Small Specimen

Nogami

Hisaka

Fujiwara

et al. 2017

Plasma and Fusion Research

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For developing the high temperature fatigue life evaluation method using small specimen, the effect of specimen size and test environment on the high temperature fatigue life of the reduced activation ferritic/martensitic steel, F82H-IEA, was investigated at 550• C under the total strain range of 0.5 -1.2 % using a new high temperature low cycle fatigue testing machine for the small round-bar specimen. No significant effect of the test environment (oxidation) on the fatigue life was observed in the standard-size specimen, whereas the slight reduction of the fatigue life due to that was indicated in the small-size specimen, especially at the final fracture stage of the test. It could be concluded that the new high temperature low cycle fatigue testing machine of the present study could satisfy the minimum requirements for the high temperature low cycle fatigue life evaluation using small specimen because the fatigue life data obtained using this testing machine could be acceptable based on the comparison with the previous studies data. To improve the reliability and the applicability of this test technology, further evaluations under the wider test temperature and strain conditions are expected in future.

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Section: Resultsmentioning

confidence: 77%

Section: Resultsmentioning

confidence: 99%

High Temperature Fatigue Life Evaluation Using Small Specimen

Nogami

Hisaka

Fujiwara

et al. 2017

Plasma and Fusion Research

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“…Therefore, the effect of cycling on the creep properties (lifetime and minimum creep rate) remains marginal. As detailed elsewhere, the fatigue damage [36,38] is directly related to the plastic strain amplitude applied during cycling. The absence of plastic strain applied during cycling can thus explain the similarity with conventional creep tests.…”

Section: Discussionmentioning

confidence: 99%

“…[36] The cyclic tests were controlled in terms of total strain, which was measured with a capacitive extensometer. The cyclic strain rate was equal to 2AE10 À3 s À1 for all tests.…”

Section: B Cf Testsmentioning

confidence: 99%

Creep-Fatigue Interactions in a 9 Pct Cr-1 Pct Mo Martensitic Steel: Part I. Mechanical Test Results

Fournier

Sauzay

Caës

et al. 2008

Metall Mater Trans A

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Creep-fatigue (CF) tests are carried out on a modified 9 pct Cr-1 pct Mo (P91) steel at 550°C. These CF tests are strain controlled during the cyclic part of the stress-strain hysteresis loop and then load controlled when the stress is maintained at its maximum value, to produce a prescribed value of the creep strain before cyclic deformation is reversed under strain-controlled conditions. The observed cyclic softening implies that the applied creep stress continuously decreases with the number of cycles. However, the minimum creep rates measured at the end of the holding periods do not decrease when the applied stress decreases. The minimum creep rates measured at the end of these tests can be hundreds of times faster than those observed for the asreceived material. This acceleration of creep rates can be to the microstructural coarsening and to the decrease of the dislocation density observed after fatigue and CF loadings. Cyclic creep tests consisting of very long holding periods interrupted by unloading/reloading are also carried out. These results suggest that cyclic loadings affect the creep lifetime and flow behavior only if a plastic strain is applied during cycling. Creep tests carried out on a material cyclically prestrained and fatigue tests carried out on a material previously deformed in creep confirm that the deterioration of the mechanical properties is much faster in fatigue and CF compared to creep.

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“…Tensile and compressive holds with the same duration have usually different influence on the creep-fatigue life for many materials. For example 9-12 % Cr steels compressive hold phases more detrimental than tensile ones, in the sense that the fatigue life is more severely reduced under compressive holds than under tensile holds (Aktaa and Petersen 2009;Fournier et al 2008). This effect might be surprising as one expects creep damage evolution under tension rather than under compression hold phases.…”

Section: Low Cyclementioning

confidence: 99%

Analysis of Inelastic Behavior for High Temperature Materials and Structures

Naumenko

Altenbach

2015

Advanced Structured Materials

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This review provides a current status in modeling and analysis of structures for high-temperature applications. Basic features of inelastic behavior of heat resistant alloys are discussed. Typical responses for stationary and varying loading and temperature are presented and classified. Microstructural features and microstructural changes in the course of inelastic deformation at high temperature are discussed. The state of the art on material modeling and structural analysis in the inelastic range at high temperature is resented.Keywords Creep · Low cycle fatigue · Damage mechanics · Length scales · Temporal scales · Structural analysis IntroductionThe aim of this contribution is to give an overview of experimental and theoretical approaches to analyze the behavior of materials and structures subjected to mechanical loading and "high-temperature" environment. The definition of "hightemperature" materials and "high-temperature" structures can be related to the value of the homologous temperature, that is T /T m , where T is the absolute temperature and T m is the melting point of the considered material. Materials that can be efficiently used within the temperature range 0.3 < T /T m < 0.7 are called hightemperature materials. Examples include heat resistant steels, nickel-bases alloys, age-hardened aluminum alloys, cast iron materials and metal matrix composites. Structures that operate in the temperature range 0.3 < T /T m < 0.7 over a long period of time are called high-temperature structures. Examples include turbine

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Creep-fatigue-oxidation interactions in a 9Cr–1Mo martensitic steel. Part II: Effect of compressive holding period on fatigue lifetime

Cited by 82 publications

References 0 publications

High Temperature Fatigue Life Evaluation Using Small Specimen

High Temperature Fatigue Life Evaluation Using Small Specimen

Creep-Fatigue Interactions in a 9 Pct Cr-1 Pct Mo Martensitic Steel: Part I. Mechanical Test Results

Analysis of Inelastic Behavior for High Temperature Materials and Structures

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