A new flow stress model based on Arrhenius equation to track hardening and softening behaviors of Ti6Al4V alloy
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The conventional Arrhenius-type model was adopted to identify the deformation characteristic of Ti6Al4V (TC4) titanium alloy based on the stress–strain curves of isothermal compression test. A new flow stress model based on Arrhenius equation was proposed for TC4, which is composed of peak flow stress (PFS) prediction and strain compensation. The predicted PFS is set as a reference to derive the flow stress model at any strain ranging from approximately 0 to 0.7. The predictability and efficiency among the proposed model, conventional model, and an existing physical-based model of TC4 were comparatively evaluated. It is found that the newly proposed model can simultaneously track the hardening and softening behaviors of TC4 through a single expression while the other existing models are only valid in the softening region. Besides, the wider application range and acceptable accuracy of the new model have been achieved by fewer material constants with much-simplified modeling procedure than the other models.
KeywordsFlow stress model Arrhenius equation Hot deformation Flow behavior Titanium alloy
This study was financially supported by the National Natural Science Foundation of China (No. 51475295).