Strain partitioning between matrix and precipitates during fatigue deformation of 2.25Cr

Abstract

The influence of stress rate on load/strain partitioning between different phases of a micro-alloyed 2.25Cr–Mo steel during stress-controlled fatigue deformation at room temperature (RT) was studied by conducting asymmetrical ratcheting fatigue tests employing values of 50–450 MPa/s. Fatigue life (N_f) significantly reduced for tests conducted by employing = 50 MPa/s compared to 450 MPa/s, i.e. N_f= 510 and 24,983 cycles respectively. From TEM studies, it is confirmed that due to load/strain partitioning stacking faults (SFs)/micro-twin formed in M₂₃C₆ carbides during high fatigue deformation, whereas dislocation cells are formed in low fatigue deformation. A plausible explanation to account for different cycle life with change in of fatigue deformation is offered.

Keywords

Cyclic strain defects fatigue life stacking faults microstructure micro-twin

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References

Bendick

Gabrel

Hahn

New low alloy heat resistant ferritic steels T/P23 and T/P24 for power plant application. Int J Press Vessels Pip. 2007; 84:13–20. doi: 10.1016/j.ijpvp.2006.09.002

Vishnuvardhan

Raghava

Gandhi

Ratcheting failure of pressurised straight pipes and elbows under reversed bending. Int J Press Vessels Pip. 2013; 105–106:79–89. doi: 10.1016/j.ijpvp.2013.03.005

Kulkarni

Desai

Kant

Uniaxial and biaxial ratchetting study of SA333 Gr.6 steel at room temperature. Int J Press Vessels Pip. 2003; 80:179–185. doi: 10.1016/S0308-0161(03)00029-2

Rajpurohit

Srinivas

NCS

Singh

Fatigue behavior of Zircaloy-2 under asymmetric loading at 400°C. Int J Press Vessels Pip. 2018; 159:84–92. doi: 10.1016/j.ijpvp.2017.11.012

Hou

KM.

Alloy carbide precipitation in tempered 2.25 Cr–Mo steel under high magnetic field. Acta Mater. 2013; 61:2016–2024. doi: 10.1016/j.actamat.2012.12.021

Jones

Gioacchino

Lim

Reduced partitioning of plastic strain for strong and yet ductile precipitate-strengthened alloys. Sci Rep. 2018; 8:8698–8711. doi: 10.1038/s41598-018-26917-0

Shetty

MN.

Dislocations and mechanical behavior of materials, PHI Learning Pvt. Ltd., Delhi (2013) pp. 331.

Westgren

, Nature (1993) pp. 480.

Bowman

Arnold

Storms

The crystal structure of Cr23C6. Acta Crystal B Struct Crystal Crystal Chem. 1972: 3102–3103. doi: 10.1107/S0567740872007526

10.

Yong-Hua

Yong-Xiang

Xiang

HG.

Characterization of M23C6 carbide precipitated at grain boundaries in a superalloy. Metallography. 1989; 22:47–55. doi: 10.1016/0026-0800(89)90021-9

11.

Twinning structure of M₂₃C₆carbide precipitated at twin-related grain boundaries in Alloy 600. Philos Mag. 2016: 551–559. doi: 10.1080/14786435.2016.1143127

12.

Xia

Chen

Generalized stacking fault energies of Cr23C6 carbide: a first-principles study. Comput Mater Sci. 2019; 158:20–25. doi: 10.1016/j.commatsci.2018.11.006

13.

Fultz

Howe

Transmision electron microscopy and difractometry of materials. Fourth edition New York: Springer; 2013; pp. 405.

Strain partitioning between matrix and precipitates during fatigue deformation of 2.25Cr–Mo steel

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