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To investigate the hot deformation behavior of powder-forged(P/F)Fe-0.5C-2Cu steel,the hot compression tests were conducted at temperatures ranging from 900to 1 000 ℃ and strain rates from 0.1to 10s-1 using Gleeble-1500thermal simulator.The true stress-true strain curves at different temperatures and strain rates of P/F steel were obtained.It is found that dynamic recovery only occurs as strain rate is 10s-1 at 900℃,and the dynamic recrystallization is the main softening mechanism.The flow stress increases with decreasing temperature and increasing strain rate.The experimental data are employed to develop constitutive equations on the basis of the Arrheniustype equation by introducing the strain with nonlinear fitting.The flow stresses predicted by the proposed constitutive equations are in good agreement with the experimental values,and the correlation coefficient(R2)and the average absolute relative error(AARE)are 0.995 25and 3.07%respectively.These results indicate the proposed constitutive equations can effectively describe the hot deformation behavior of the material.
To investigate the hot deformation behavior of powder-forged (P / F) Fe-0.5C-2Cu steel, the hot compression tests were conducted at temperatures ranging from 900to 1 000 ° C and strain rates from 0.1to 10s-1 using Gleeble-1500thermal simulator. true stress-true strain curves at different temperatures and strain rates of P / F steel were obtained. It is found that dynamic recovery only occurs as strain rate is 10 s-1 at 900 ° C., and the dynamic recrystallization is the main softening mechanism. flow stress increases with decreasing temperature and increasing strain rate. the experimental data are employed to develop constitutive equations on the basis of the Arrheniustype equation by introducing the strain with nonlinear fitting. flow force predicted by the proposed constitutive equations are in good agreement with the experimental values, and the correlation coefficient (R2) and the average absolute relative error (AARE) are 0.995 25 and 3.07% respectively. constitutive equations can effectively describe the hot deformation behavior of the material.