Journal Published Online: 05 June 2019
Volume 8, Issue 5

New Phenomenological Model to Predict High-Temperature Flow Stress Curves at High Strain Rates

CODEN: MPCACD

Abstract

In this study, a new phenomenological equation has been presented to predict high-temperature flow stress curves of metallic materials at industrially relevant deformation conditions with negligible flow softening. To this end, a nonlinear estimation of strain-hardening rate versus strain curves was employed to obtain flow stress as a function of strain. To prove the validity and competency of the presented model, flow stress curves of Alloy 800 H obtained at temperatures from 850°C to 1,050°C and at strain rates of 5 s−1 and 10 s−1 were used. The evaluation of the mean error of flow stress revealed that the presented model can give a precise estimation of stress-strain curves of Alloy 800 H at high strain rates. The Johnson-Cook and logarithmic power models were also used to show the accuracy of the presented model at different deformation conditions. It was discovered that the presented model can provide a more accurate estimation of flow stress curves for the alloy of this study.

Author Information

Shafiei, E.
Department of Materials Engineering, Islamic Azad University, Bandar Abbas Branch, Daneshgah Blvd., Bandar Abbas, Hormozgan, Iran
Ostovan, F.
Department of Materials Engineering, Islamic Azad University, Bandar Abbas Branch, Daneshgah Blvd., Bandar Abbas, Hormozgan, Iran
Pages: 8
Price: $25.00
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Stock #: MPC20190003
ISSN: 2379-1365
DOI: 10.1520/MPC20190003