The effect of strain rate and temperature on the elevated temperature tensile flow behavior of service-exposed 2.25Cr-1Mo steel

The elevated temperature tensile flow behavior of service-exposed 2.25Cr-1Mo steel has been critically examined with respect to strain rate sensitivity ( m) and apparent activation energy ( Q) for tensile deformation. The predominant role of forest dislocations in determining the relative flow respo...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2007-09, Vol.465 (1), p.109-115
Main Authors: Girish Shastry, C., Parameswaran, P., Mathew, M.D., Bhanu Sankara Rao, K., Mannan, S.L.
Format: Article
Language:English
Subjects:
2.25Cr-1Mo steel
Apparent activation energy
Applied sciences
Elasticity. Plasticity
Exact sciences and technology
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Strain rate effect dislocation–dislocation interaction
Tensile deformation behavior
Thermal activation
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Summary:The elevated temperature tensile flow behavior of service-exposed 2.25Cr-1Mo steel has been critically examined with respect to strain rate sensitivity ( m) and apparent activation energy ( Q) for tensile deformation. The predominant role of forest dislocations in determining the relative flow response at true plastic strains greater than 0.01 is inferred from the profile of ‘ m’ against flow stress. The variation of ‘ m’ with temperature and strain is discussed based on the kinetics of dislocation generation and recovery. The decrease in Q with the increase in strain rate or temperature is attributed to the increase in recovery processes like dislocation annihilation and subcell/subgrain formation. This suggestion has been supported by transmission electron microscopy.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2007.02.052