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

Rajpurohit, R S and Jena, P S M and Mahato, B and Sahu, J K (2020) Strain partitioning between matrix and precipitates during fatigue deformation of 2.25Cr-Mo steel. Material Science and Technology .

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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.

Item Type:Article
Official URL/DOI:http:// 10.1080/02670836.2020.1762981
Uncontrolled Keywords:Cyclic strain; defects; fatigue life; M23C6 carbide; stacking faults; microstructure; micro-twin;carbides
Divisions:Material Science and Technology
ID Code:8151
Deposited By:Sahu A K
Deposited On:11 Jun 2020 10:37
Last Modified:11 Jun 2020 10:37
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