Constitutive modeling for high temperature compressive deformation of non-oriented electrical steel

Abstract

A material mechanical model provides basic data for numerical simulation and technological optimization during the forming process. In this paper, the flow behavior of the hot compressive deformation 0.3 wt.-% Si non-orientation electrical steel were investigated by thermal simulation tests, and a constitutive model was built based on a new modeling method. The thermal simulation tests conducted on a Gleeble 1500 thermo-mechanical simulator over a range of temperatures from 750 to 1050 °C and strain rates from 0.1 to 10 s−1. To predict the hot deformation process of the silicon steel, a constitutive model based on the multiple regression method was developed. Prediction results showed that the proposed model can track deformational behavior accurately. The model was applied to finite element (FE) simulation, and the FE calculation results matched the industry production data satisfactorily.

Effects of Transversal Temperature Distribution and Phase State on Strip Profile During Hot Rolling Process

“…The stress–strain curves are obtained from a hot compression test, in which the experiment temperature, strain, and strain rate cover the whole hot finishing rolling process. To describe the flow stress at any deformation temperature, strain, and strain rate, a constitutive model [ 20 ] is established based on the multiple regression method. In this way, the flow stress of the rolled strip can be acquired with the constitutive model according to the actual industrial condition.…”

“…Considering the complexity of the strip steel production, the FE model is applicable to simulate the hot rolling process. [ 10,20 ]…”

“…Considering the complexity of the strip steel production, the FE model is applicable to simulate the hot rolling process. [10,20] Control variable method is adopted in the FE simulations. Only the strip temperature is changed in the FE simulations.…”

“…The flow stress in the dual phase of 945 °C and single phase of 880°°C is calculated by the constitutive model. [20] The FE simulation conditions in this paper are shown in Table 2. Particularly, it is important to realize that the phase transformation point differs from cooling rate.…”

“…Under single‐phase state, the flow stress increases as the steel temperature reduces, while under dual‐phase state, the tendency of the flow stress is opposite to that of the single phase. [ 20 ] The mechanical property of the rolled strip changes with phase transformation, which would cause significant changes in strip profile. The effects of phase transformation on strip profile have been involved in the investigations by Song et al [ 18 ] and Liu et al [ 19 ] However, thus far, the effects of the transversal temperature distributions of the strip steel on strip profile have not been fully clarified in the previous research.…”