Abstract
The warm deformation behavior of 20CrMoA steel at the temperature of 873–1123 K and the strain rate of 0.01−10 s−1 was investigated to obtain its processing property and optimum processing parameters. The true stress-true strain curves showed that flow stress reaches the peak rapidly, followed by slow decrease till reaching a steady state. This suggests a flow softening of dynamic recovery. The stress dropped with increasing deformation temperature and decreasing strain rate. The reduction became more distinct at lower temperature and higher strain rate due to flow softening caused by deformation heat. In the temperature range of 873–973 K, the deformation of 20CrMoA steel was more sensitive to temperature, and the average decline rate of steady stress was 6.9 times larger than that in the temperature range of 1023–1123 K. After modifying the stress curves, a constitutive model was developed for different deformation temperature ranges based on modified curves. The model was in good agreement with the experimental results.
Highlights
Warm forming generally refers to plastic deformation at a temperature of 873–1123 K, which combines the advantages of cold forming and hot forming
Abdollah-Zadeh proposed that continuous dynamic recrystallization was responsible for the ferrite grain refinement during warm deformation of a low carbon Nb-microalloyed steel [3]
Rahul suggested that the recrystallization texture of ultra-low carbon steel was developed and influenced by deformation temperature after complete recrystallization [5]
Summary
Warm forming generally refers to plastic deformation at a temperature of 873–1123 K, which combines the advantages of cold forming and hot forming. In this study of WCWR, a low carbon and low alloy steel 20CrMoA was selected to investigate its warm deformation behavior by compression tests, which can establish a foundation for WCWR of shaft parts. It has high quenching ability, good machinability and cold strain plasticity [26]. The sensitivity to various temperature ranges of the selected material was analyzed and the suitable forming temperature is suggested, a constitutive model is developed based on modified flow stress and strain compensation. The validity and accuracy of results predicted by the proposed model is investigated by comparing with the experimental curves
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