Abstract
Using the wedge plastometer, incremental and continuous straining tests were performed on ENIA, EN24 and EN2 steels at 800 and 1100°C, respectively. Nimonic alloy 90D steel was tested at 1100 and 1250°C. Strain rates of 0.05 and 0.12 s−1 were employed.Saturation strains varied from 0.15 for EN24 at 1100°C to 0.55 for ENIA at 800°C. Maximum stresses obtained varied from 55 MN/m2 for EN2 at 1100°C to 240 MN/m2 for nimonic alloy 90D at 1100°C. Based on the results, four models were proposed and developed thus:<list list-type="simple"><list-item>(1) Muiltistage incremental straining model: predicts values of continuous stress and strain from incremental stress-strain curves.</list-item><list-item>(2) Stress peak model: predicts continuous stress-strain curves from incremental curves through the use of stress restoration index.</list-item><list-item>(3) Strain history model: predicts continuous strain-time curves from incremental stress-strain curves using “negative strain” restoration index.</list-item><list-item>(4) Creep model for wedge plastometer: relates variation in creep strain rate during a holding time to the testing strain rate.</list-item></list>Models were applied to EN2 steel and other materials and results analysed.
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