Low cycle fatigue behavior of modified 9Cr–1Mo steel at room temperature

Verma, Preeti; Srinivas, N.C. Santhi; Singh, Surendra Prasad; Singh, Vakil

doi:10.1016/j.msea.2015.11.060

Cited by 63 publications

(33 citation statements)

References 25 publications

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“…Figure 9(c and e) demonstrate that the original PAG structure was not significantly changed during SWT and DWT, whereas the formation of sub-grains that are < 1 µm in diameter was extensively observed within the martensitic blocks, Figure 9(d and f). This is consistent with existing observations from similar 9-12% Cr steels demonstrating similar resultant microstructures after LCF exposure (Mishnev et al, 2016;Verma et al, 2016).…”

Section: Ebsd Mapping Analysissupporting

confidence: 92%

“…The transformation of the martensitic substructure is also commonly accompanied with a decrease in dislocation density due to the rearrangement of dislocation structure and the annihilation of mobile dislocations, which contributes to a decrease in stress amplitude during cyclic fatigue testing (Pineau and Antolovich, 2015;Shankar et al, 2006). The increase in stress amplitude and the time period of stress duration have been shown to accelerate the coarsening of the martensitic substructure (Shankar et al, 2006;Verma et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

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Characterization of cyclic behavior, deformation mechanisms, and microstructural evolution of MarBN steels under high temperature conditions

Benaarbia

Sun

et al. 2020

International Journal of Fatigue

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In this paper, the low cycle fatigue behaviour of MarBN steels at elevated temperatures is discussed. Four cyclic loading waveforms were applied to investigate both the mechanical and microstructural features. The mechanical results exhibit continuous cyclic softening and decelerated stress relaxation, recoverable viscoelasticity at both short and long time scales and irrecoverable viscoplastic mechanisms. Detailed microstructural characterisation was also conducted to investigate the rupture behaviour of the investigated steel. The microstructural findings indicate typical transgranular and ductile fracture behaviour, extensive sub-grain formation and structural refinement as well as significant decrease in hardness close to the fracture surface.

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Section: Ebsd Mapping Analysissupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Characterization of cyclic behavior, deformation mechanisms, and microstructural evolution of MarBN steels under high temperature conditions

Benaarbia

Sun

et al. 2020

International Journal of Fatigue

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“…Attention has already been paid since a long time on the low cycle fatigue behaviour of 9% Cr from room temperature [6] up to 600°C [7]. The cyclic response is characterized by a softening which is dependent on strain rate and test temperature.…”

Section: Introductionmentioning

confidence: 99%

Stability of fatigue cracks at 350 °C in air and in liquid metal in T91 martensitic steel

Vogt

Bouquerel

Carle

et al. 2020

International Journal of Fatigue

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The low cycle fatigue behaviour of a 9Cr1MoNbV martensitic steel has been investigated at 350°C in air and in lead-bismuth eutectic (LBE) with low and high oxygen content. Total strain controlled tests were performed from t = 0.40% to 1.2%. The material exhibited a pronounced cyclic softening in both environments. LBE reduced the fatigue resistance. LBE accelerated the formation of the long crack by promoting the growth of the first short cracks. A clear change in propagation mode was observed. In air, ductile fatigue striations were observed while in LBE a brittle fracture decorated by voluminous and largely spaced striations were visible. From EBSD analysis, it was concluded that in LBE, the long crack advanced quickly by repeated and discontinuous cleavage.

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“…First, the poor long-term aging structure stability and the low high-temperature creep resistance of RAFM steels limit their service temperature and affect the conversion efficiency of the nuclear fusion reactor [2,18]. Second, the creep-fatigue cyclic softening phenomenon in RAFM steels limits the maximum load of the nuclear fusion reactor [19][20]. Third, the structure stability of RAFM steels is poor at high temperatures.…”

Section: Introductionmentioning

confidence: 99%

Strengthening mechanisms of reduced activation ferritic/martensitic steels: A review

Zhou

Shen

Jia

2021

Int J Miner Metall Mater

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This review summarizes the strengthening mechanisms of reduced activation ferritic/martensitic (RAFM) steels. High-angle grain boundaries, subgrain boundaries, nano-sized M 23 C 6 , and MX carbide precipitates effectively hinder dislocation motion and increase high-temperature strength. M 23 C 6 carbides are easily coarsened under high temperatures, thereby weakening their ability to block dislocations. Creep properties are improved through the reduction of M 23 C 6 carbides. Thus, the loss of strength must be compensated by other strengthening mechanisms. This review also outlines the recent progress in the development of RAFM steels. Oxide dispersion-strengthened steels prevent M 23 C 6 precipitation by reducing C content to increase creep life and introduce a high density of nano-sized oxide precipitates to offset the reduced strength. Severe plastic deformation methods can substantially refine subgrains and MX carbides in the steel. The thermal deformation strengthening of RAFM steels mainly relies on thermo-mechanical treatment to increase the MX carbide and subgrain boundaries. This procedure increases the creep life of TMT(thermo-mechanical treatment) 9Cr-1W-0.06Ta steel by ~20 times compared with those of F82H and Eurofer 97 steels under 550°C/260 MPa.

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Low cycle fatigue behavior of modified 9Cr–1Mo steel at room temperature

Cited by 63 publications

References 25 publications

Characterization of cyclic behavior, deformation mechanisms, and microstructural evolution of MarBN steels under high temperature conditions

Characterization of cyclic behavior, deformation mechanisms, and microstructural evolution of MarBN steels under high temperature conditions

Stability of fatigue cracks at 350 °C in air and in liquid metal in T91 martensitic steel

Strengthening mechanisms of reduced activation ferritic/martensitic steels: A review

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Low cycle fatigue behavior of modified 9Cr–1Mo steel at room temperature

Cited by 63 publications

References 25 publications

Characterization of cyclic behavior, deformation mechanisms, and microstructural evolution of MarBN steels under high temperature conditions

Characterization of cyclic behavior, deformation mechanisms, and microstructural evolution of MarBN steels under high temperature conditions

Stability of fatigue cracks at 350 °C in air and in liquid metal in T91 martensitic steel

Strengthening mechanisms of reduced activation ferritic/martensitic steels: A review

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Stability of fatigue cracks at 350 °C in air and in liquid metal in T91 martensitic steel