Physics-based Constitutive Model for the Hot Deformation of 2Cr11Mo1VNbN Martensitic Stainless Steel
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The hot deformation behavior of 2Cr11Mo1VNbN martensitic stainless steel is investigated through isothermal compression tests between 1173 and 1423 K with strain rates of 0.005-5 s−1. Based on experimental results, the work hardening–dynamic recovery stage and dynamic softening stage are evaluated, and a couple-stage constitutive model is developed to describe the work hardening–dynamic recovery and dynamic softening behaviors. Phenomenological constitutive models, which consider temperature, strain and strain rate, are established. A comparison between the predicted and experimental flow stress values indicates that the established models accurately describe the hot deformation behaviors for the studied supercritical steel.
Keywordsconstitutive modeling dynamic recrystallization dynamic recovery hot deformation work hardening
The authors appreciate the financial support from the Fundamental Research Funds for the Central Universities [Grant Number CDJZR14130006]. The authors would like to thank Emily Purser from University of Wollongong, Australia, and Yao Wen from Hunan Institute of Information Technology, China, for their grammar and spelling check.
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