Abstract
In this work, a compression experiment of 35CrMo steel is carried out over a wide range of temperatures (1123–1423 K) and strain rates (0.1–10 s−1) to obtain further understandings of the flow behaviors. The results show that the strain hardening effect of 35CrMo steel is stronger than that of dynamic recrystallization at low temperature and high strain rate; on the contrary, the rheological curves show typical dynamic recrystallization characteristics at high temperature and low strain rate. This indicates that the strain hardening and recrystallization behavior of 35CrMo steel is affected by temperature, strain and strain rate, and its true stress-strain curves can be observed typical work hardening and dynamic softening features. A modified Johnson-Cook (JC) model is developed to predict the flow stress of the alloy. The results of the comparison show that the predicted values of the modified JC model are in good agreement with the experimental values.
Highlights
35CrMo steel has been widely used in the manufacture of various large components and medium-sized parts, such as driveshafts, crankshafts, and fasteners, for its excellent characteristics of good wear, impact, fatigue, and corrosion resistance [1,2,3,4,5]
In order to effectively predict the high temperature flow stress of alloys and metals, researchers put forward different kinds of constitutive equation, which can be divided into phenomenological constitutive models, artificial neural network models, and physics-based models
At high temperature and low strain rate, the stress increased rapidly to the peak after a slight decline, and followed by a steady state flow. This indicates that the strain hardening and recrystallization behavior of 35CrMo steel is affected by temperature, strain, and strain rate
Summary
The study of V-4Cr-4Ti [29], medium carbon and vanadium microalloyed steels [30], and Mg-Al-Zn alloy [31] shows that the constitutive equation based on microscopic mechanism has good applicability, which can be used to characterize the relationship between flow stress and microstructure during high-temperature rheological process. These physics-based models, including the DRX model, ZA model, MTS model, and BP model, etc., are mainly based on dislocation theory and kinetics of slip. It is necessary to further study the applicability of the JC model to 35CrMo steel within a certain temperature and strain rate range
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