Study on hot workability and optimization of process parameters of a modified 310 austenitic stainless steel using processing maps |
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| Affiliation: | 1. School of Materials Science and Engineering, University of Science and Technology Beijing, Xueyuan Road 30, Haidian District, Beijing 100083, China;2. Science and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, P.O. Box 436, Chengdu, Sichuan 610041, China;3. School of Mechanical Engineering, Anyang Institute of Technology, West of Huanghe Road, Wenfeng District, Anyang, Henan Province 455002, China;1. Institute of Materials Engineering, TU Bergakademie Freiberg, Gustav-Zeuner-Straße 5, 09599 Freiberg, Germany;2. GfE Fremat GmbH, Gewerbegebiet Süd 20, 09618 Brand-Erbisdorf, Germany;1. Department of Mechanical Engineering, BITS-Pilani, Hyderabad Campus, Telangana 500078, India;2. Department of Mechanical Engineering, GRIET, Hyderabad, Telangana 500072, India;1. H. Milton Stewart School of Industrial and Systems Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA;2. 3D Printing Medical Research Center, China Medical University Hospital, Taichung City 40447, Taiwan;1. School of Mechanical, Materials and Mechatronics Engineering, University of Wollongong, Wollongong 2522, Australia;2. UOW Electron Microscopy Centre, University of Wollongong, Wollongong 2522, Australia |
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| Abstract: | To investigate the optimized hot deformation parameters of a modified 310 austenitic stainless steel, the hot compression tests were performed using a Gleeble 3500 thermal simulator. The hot deformation behavior and hot workability characteristics were investigated in a temperature range of 800–1100 °C and a strain rate range of 0.1–10 s−1. The hot processing maps of the tested steel were developed based on the dynamic material model (DMM), from which the safe deformation regions and instable deformation regions were determined. The corresponding microstructural and hardness evolutions during deformation were analyzed in detail. It was found that the deformation in the safe regions was beneficial to dynamic recovery (DRY) and dynamic recrystallization (DRX), while the deformation in unstable region would lead to flow instability, kink boundaries and grain growth. Near 950 °C, the energy dissipation rates were unusually lower, and the hardness of the deformed sample exhibited a significant increase, as a result of strain-induced precipitation. Coupled with the microstructure analysis and processing map technology, the workability map was schematically plotted and the optimal working conditions were determined. Such conditions were: temperatures in the range of 1075–1100 °C and strain rates in the range of 0.5–1.7 s−1. These conditions are critical to attain an excellent homogeneous microstructure with fine grains after deformation for the modified 310 austenitic stainless steel. |
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| Keywords: | Austenitic stainless steel Hot workability Processing map Microstructure Hardness |
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