Study on High Temperature Flow Stress Model of As-cast SA508-3 Low Alloy Steel

Abstract:

In order to obtain the high temperature flow behavior of as-cast SA508-3 low alloy steel, the stress-strain curves of steel are obtained by Gleeble thermal simulation compression test at deformation temperature 800°C-1200°C and strain rate 0.001s^-1-1s^-1. Based on Laasraoui two-stage flow stress model, a high temperature flow stress model is established by multiple linear regression method. The results show that the peak stress characteristics are not obvious at low temperature and high strain rate, which is a typical dynamic recovery characteristic. Meanwhile, the peak stress characteristics are obvious at high temperature and low strain rate, which is a typical dynamic recrystallization characteristic. By means of the comparisons between experiments and calculations, the Laasraoui two-stage flow stress model can truly reflect flow behavior of steel at high temperature, which provides theoretical guidance for the hot deformation of the steel.

• Periodical: Key Engineering Materials (Volume 831)
• Pages: 25-31
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.831.25
• Online since: February 2020
• Authors: Pan Fei Fan*, Jian Sheng Liu, Hong Ping An, Li Li Liu
• Keywords: As-Cast SA508-3 Steel, Dynamic Recrystallization, Flow Stress Model, Thermal Compression

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