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- 저자 : Z. Sangari Motlagh (검색결과 1 건)
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Prediction of Hot Deformation Flow Curves of 1.4542 Stainless Steel
Z. Sangari Motlagh,B. Tolaminejad,A. Momeni 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.8
The ability of four constitutive equations, Johnson–Cook (JC), Zerilli–Armstrong (ZA), Arrhenius-type constitutive equationsand a newly developed phenomenological model for describing the hot flow behavior of 1.4542 stainless steel was evaluated. The hot flow curves were obtained from hot compression tests in the temperature range of 900–1050 °C and at strain ratesof 0.001–1 s−1. The JC model was not able to predict the softening part of the flow curves owing to the separated effects ofstrain, strain rate and temperature on the flow stress. The original ZA model was found to be useful at large strains but theoverall consistency between the experimental and the calculated flow curves was not good. The subsequent modifications ofthe ZA model for low strain levels resulted in acceptable predictions. It is observed that the Arrhenius-type predicted flowcurves well agree with the experimental results especially at low strain rates. However, at high strain rates where the steadystate condition is shifted to large strains, some deviations were observed at low strain levels. Finally, a phenomenologicalmodel was constructed based on the nonlinear estimation of work hardening. The flow curves developed by the model couldpredict the experimental ones with satisfactory precision.
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