Abstract
Hot deformation behavior of Fe-30Mn-0.11C steel was investigated. Hot compression tests were carried out at various temperatures ranging from 800 °C to 1200 °C and at different strain rates of 0.01 s−1 to 10 s−1. The constitutive equation based on peak stress was established. Hot processing maps at different strains and recrystallization diagrams were also established and analyzed. The results show that dynamic recrystallization easily occur at high deformation temperatures and low strain rates. Safe and unstable zones are determined at the true strain of 0.6 and 0.7, and the hot deformation process parameters of partial dynamic recrystallization of the tested steel are also obtained.
Highlights
Hot processing is an important metal forming process, and a combination of work hardening, dynamic recovery, and dynamic recrystallization processes [1,2]
A high-Mn austenitic steel containing 0.11C, 30.5Mn, which was coming from an experimental cast was selected for the present study where an ingot was produced from a vacuum experimental cast was selected for the present study where an ingot was produced from a vacuum induction furnace and subsequently forged in the temperature range of 800–1100 °C to form a bar induction furnace and subsequently forged in the temperature range of 800–1100 ◦ C to form a bar with a diameter of 35 mm
A constitutive equation for the flow stress of the alloy at high temperatures was successfully obtained as a function of deformation temperatures and strain rates
Summary
Hot processing is an important metal forming process, and a combination of work hardening, dynamic recovery, and dynamic recrystallization processes [1,2]. The occurrence of dynamic recrystallization, which can refine grains and reduce deformation resistance, significantly affects the forming properties, microstructure, and mechanical properties of the materials [3]. The flow stress model can reflect changes in the microstructure of the material and can be utilized to predict the hot deformation behavior of materials [4]. A hot processing map based on a dynamic model reflects a hot deformation mechanism of the material and is a powerful tool for the design and optimization of metal processing [5]. To study hot deformation behavior of materials, a flow stress model is established and a hot processing map is analyzed. Only a few studies on hot deformation behavior are available [14,15]
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