Flow Characteristics of Metal with Phase Transformation and Prediction of Its Microstructure
We propose a flow stress characteristic of SUS430F steel that takes in account the effects of temperature, strain rate and their deformation history. In the framework of this characteristic, the history effects of strain rate and temperature are estimated through the plastic strain energy stor...
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| Date: | 2002 |
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| Main Authors: | , |
| Format: | Article |
| Language: | English |
| Published: |
Інститут проблем міцності ім. Г.С. Писаренко НАН України
2002
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| Series: | Проблемы прочности |
| Subjects: | |
| Online Access: | http://dspace.nbuv.gov.ua/handle/123456789/46757 |
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| Journal Title: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Cite this: | Flow Characteristics of Metal with Phase Transformation and Prediction of Its Microstructure / T. Shirakashi, M. Yoshino // Проблемы прочности. — 2002. — № 3. — С. 22-29. — Бібліогр.: 6 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| Summary: | We propose a flow stress characteristic of
SUS430F steel that takes in account the effects
of temperature, strain rate and their deformation
history. In the framework of this characteristic,
the history effects of strain rate and
temperature are estimated through the plastic
strain energy stored. The formulated characteristic
(σ) may be shown as the function of temperature
(θ), strain rate (ε), and the stored energy
(W) or the reference stress (σst). The energy is
stored through plastic deformation and released
during annealing process. The energy is also re ferred
by the yield flow stress (ost), which is
measured under the reference condition. The
discussion on the characteristic is extended to
the material under high temperature
(1073-1473 K) with α + γ phase in the given
phase ratio. The equilibrium ratio of α or γ
phase under given temperature can be estimated
on the basis of an equilibrium phase diagram.
In order to introduce the flow stress
characteristic with phase transformation using
the proposed formulation, we also analyze the
phase transformation rate from α to α + γ with
temperature elevation, and from α to γ + α in
cooling process based on “time-temperature-
transformation” diagram that includes the
quenching process as well. The flow stress characteristic
and phase ratio are estimated simultaneously
for a hot forging process. |
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