A possible stabilizing effect of work hardening on the tensile performance of superplastic materials
A possible stabilizing effect of work hardening on the tensile performance of superplastic materials
In general, the process of superplastic deformation is regarded as steady-state so that the flow stress is given as a function of the strain rate only, thereby emphasizing the significance of the strain rate sensitivity and its determining methods. In this work, in addition to the important role of the strain rate sensitivity, it is shown that it is necessary also to consider the stability criteria for real, stable superplastic deformation through other factors such as work hardening. A possible scenario is proposed to describe the process whereby the work hardening rate may stabilize the deformation process when a perturbation occurs in the cross-section of the sample. The assumption of a work hardening effect is confirmed by its application for interpretation of the systematic deviations observed between the strain rate sensitivities determined experimentally using different experimental methods.
Stability criterion, Strain rate sensitivity, Superplasticity, Tensile testing, Work hardening
448-454
Chinh, Nguyen Q.
8e075269-61a9-469c-8f71-3d52eb37dadc
Rácz, Gergely
efabf0c4-4c75-48e6-9dac-8ce063cc09cd
Gubicza, Jenő
e43bdde3-aee3-4542-9cff-cb80fa3caa99
Valiev, Ruslan Z.
ede7fb12-54a3-4d6f-a1a7-f04cc6549934
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
24 June 2019
Chinh, Nguyen Q.
8e075269-61a9-469c-8f71-3d52eb37dadc
Rácz, Gergely
efabf0c4-4c75-48e6-9dac-8ce063cc09cd
Gubicza, Jenő
e43bdde3-aee3-4542-9cff-cb80fa3caa99
Valiev, Ruslan Z.
ede7fb12-54a3-4d6f-a1a7-f04cc6549934
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Chinh, Nguyen Q., Rácz, Gergely, Gubicza, Jenő, Valiev, Ruslan Z. and Langdon, Terence G.
(2019)
A possible stabilizing effect of work hardening on the tensile performance of superplastic materials.
Materials Science And Engineering A, 759, .
(doi:10.1016/j.msea.2019.05.063).
Abstract
In general, the process of superplastic deformation is regarded as steady-state so that the flow stress is given as a function of the strain rate only, thereby emphasizing the significance of the strain rate sensitivity and its determining methods. In this work, in addition to the important role of the strain rate sensitivity, it is shown that it is necessary also to consider the stability criteria for real, stable superplastic deformation through other factors such as work hardening. A possible scenario is proposed to describe the process whereby the work hardening rate may stabilize the deformation process when a perturbation occurs in the cross-section of the sample. The assumption of a work hardening effect is confirmed by its application for interpretation of the systematic deviations observed between the strain rate sensitivities determined experimentally using different experimental methods.
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More information
Accepted/In Press date: 16 May 2019
e-pub ahead of print date: 18 May 2019
Published date: 24 June 2019
Keywords:
Stability criterion, Strain rate sensitivity, Superplasticity, Tensile testing, Work hardening
Identifiers
Local EPrints ID: 433662
URI: http://eprints.soton.ac.uk/id/eprint/433662
ISSN: 0921-5093
PURE UUID: 77e2dda9-cc09-4e63-8416-bbc6fd1e6a81
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Date deposited: 29 Aug 2019 16:30
Last modified: 06 Jun 2024 01:40
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Contributors
Author:
Nguyen Q. Chinh
Author:
Gergely Rácz
Author:
Jenő Gubicza
Author:
Ruslan Z. Valiev
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