## 1 Introduction  
Duplex stainless steel is a kind of steel that contains both austenite and ferrite phases in its metallographic structure. The two-phase structure exists independently. By correctly controlling the chemical composition and heat treatment process, duplex stainless steel can have the advantages of both ferritic stainless steel and austenitic stainless steel. These steels have been widely used in petroleum and chemical industries, military applications, the paper industry, and other fields [1]. From the perspective of material deformation, the properties of materials at different strain rates are different, as also the dominant characteristics of materials during deformation. In the process of gradually increasing from a low strain rate to a high strain rate, the degree of the deformation of the material gradually increases in severity. The material undergoes a transition from static deformation to dynamic deformation and also undergoes a transition from elastic deformation to plastic deformation. The plastic deformation of the material is divided into two stages as the strain rate increases. While the first stage only depends on the elasticity or plasticity of the material, the second stage depends on the viscosity of the material [2]. Material viscosity is generally employed to describe the relationship between fluid stress and the strain rate, which is manifested as the strain rate effect. The greater the viscosity, the more obvious the strain rate effect of the material [3]. [PERSON] et al. [4] explored the flow stress of 416 martensitic stainless steel with a strain rate from 10\({}^{-3}\) s\({}^{-1}\) to 1.5 \(\times\) 10\({}^{3}\) s\({}^{-1}\) by employing a universal testing machine and the Hopkinson pressure bar experiment. The results indicated that 416 martensitic stainless steel exhibits strain rate sensitivity. With large plastic deformation, the cutting strain rate increases with an increase in the cutting speed, reaching the order of 10\({}^{4}\) s\({}^{-1}\)[5] in high-speed cutting. Based on finite element simulations, a numerical model of the turning process of corrosion-resistant nickel-based alloy-X was established by [PERSON] et al. [6]. The results showed that the cutting force could be reduced by increasing the cutting speed and reducing the feed rate. The cutting temperature increases with an increase in the cutting speed and feed rate. Based on finite element simulations, an ultrasonic-assisted turning method using Ti6 Al4V alloy was established by [PERSON] et al. [7]. The results show that ultrasonic-assisted turning reduces the cutting force and cutting temperature and improves tool life. In engineering applications, selecting the appropriate constitutive relationship to describe the mechanical behavior of materials is the prerequisite for the bearing and failure analysis of engineering structures. [PERSON] et al. [8] reviewed the latest research progress on metal thermoviscoplastic constitutive relations and introduced and discussed several common metal thermoviscoplastic constitutive relations in detail. The Zerilli-Armstrong (Z-A) [9] constitutive model can well represent the deformation characteristics of dual-phase materials and is also a commonly used constitutive model in composite materials. However, in this study, we used the constitutive model to simulate the cutting process. The Z-A constitutive model has a high degree of agreement with the flow stress at low strain rates. However, when the strain rate exceeds 10\({}^{4}\) s\({}^{-1}\), the actual flow stress greatly deviates from the constitutive model simulation. The Steinberg-Guina (S-G) [10] constitutive model can perform well in cutting simulations within the range of the strain rate in the Hopkinson pressure bar experiment, and the data are in good agreement. However, once the strain rate is exceeded, it will cause a large deviation in the simulation results, similar to the Z-A constitutive model.